Elecraft

RFI issues

Classic

List

Threaded

47 messages Options

123

Elecraft mailing list

RFI issues

I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI?

73, Andreas

K6AKW
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

NK7Z

Re: RFI issues

Hi,

I might suspect something else...

Have you done a power off test of your home yet?

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote:

> I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI?
>
> 73, Andreas
>
> K6AKW
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Vic Rosenthal

Re: RFI issues

In reply to this post by Elecraft mailing list

One thing to try is an old-fashioned lowpass filter, such as used to be
common as a measure against TVI. If the problem is caused by the TV/FM
signals, this should help.

The K3's t/r switch can be overwhelmed by massive signals. I had such a
problem with a 50 kW AM BC station that's visible from my antenna. I
solved it by switching from vertical to horizontal polarization, but a
high-pass filter also worked.

73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/

On 18/02/2020 18:29, Andreas Wachter via Elecraft wrote:

> I live about 1.6 miles from some tall antenna towers broadcasting
> digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on
> FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB
> and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am
> unable to use my K3: solid S9+ noise on all bands using a makeshift
> dipole strung up on some trees outside my house. I’ve tried to locate
> the source of the RFI within my home but so far have been unable to
> locate any RFI emanating from within my home. Could it be that the
> TV/FM stations antenna towers, which are within direct line of sight
> from my house, might be responsible for the RFI?
>
> 73, Andreas
>
> K6AKW ______________________________________________________________
> Elecraft mailing list Home:
> http://mailman.qth.net/mailman/listinfo/elecraft Help:
> http://mailman.qth.net/mmfaq.htm Post:
> mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net Please help support this
> email list: http://www.qsl.net/donate.html Message delivered to
> [hidden email]
>

NK7Z

Re: RFI issues

In reply to this post by Elecraft mailing list

I have some pages which might help locate your RFI at:

https://www.nk7z.net/i-have-rfi-now-what-locating-it/

Also Jim Brown has a ton of data at:

http://www.audiosystemsgroup.com/publish.htm

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote:

Elecraft mailing list

Re: RFI issues

In reply to this post by Elecraft mailing list

Have you tried pulling your main AC breaker and running your K3 on a car battery? That way, you are sure that nothing in your house (switching power supplies, poor mechanical joints, etc.) is creating the noise.

I was able to convince my nearest neighbors to shut down their AC panels also after my house seemed "clean".

I finally found 2 bad crimped power line connections down the street from my and a home made fence charge at a goat farm about 300yds behind my house through the woods. Another ham and the local power company came and helped. The power company did their work and it cleared up several S units, but something was still there. Riding around with a scanner tuned to 1800kHz (AM mode) with no antenna connected yielded the goat fence. The power company came out with a listening device to verify my findings. I offered to buy the farmer a fence charger from the hardware store, but he went ahead and did it on his own - it really helped having the power company there!!

I still have a neighbor with a noisy plasma TV - an MFJ-1026 with a longwire out the window nulls it out quite well when the TV in on. Eventually the TV will die (I'm hoping).

Good luck!
Hank
K4HYJ

----- Original Message -----
From: Andreas Wachter via Elecraft ([hidden email])
Date: 02/18/20 12:39
To: [hidden email]
Subject: [Elecraft] RFI issues

I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI?

73, Andreas

K6AKW
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Jim Brown-10

Re: RFI issues

In reply to this post by Elecraft mailing list

On 2/18/2020 8:29 AM, Andreas Wachter via Elecraft wrote:
> Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI?

Very unlikely. This application not provides lots of advice on finding
and killing noise. http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Michael Walker

Re: RFI issues

In reply to this post by NK7Z

HI Andreas

Sorry to hear about your noise.

I doubt your noise is related to digital TV as that is a long way away in
the frequency world. It is pretty common to assume that it is not on your
own property. I saw one guy who said the same thing and then found out a
year later it was his new dryer that was noisy even when they were not
using it.

I would not be surprised that most of your HF noise is within your own
property unless you did some significant research by holding an AM radio
near each and every power cube or charger for phones, etc. There are not
too many that are quiet.

I use my KX2 to find most of my HF noise issues and I must have tossed out
15 bad chargers. The ones I could not just toss away, I had to add Mix 31
chokes to.

When you moved into your new house did you replace all the light bulbs with
LED bulbs? They can be noisy.

If you haven't taken the time to do an indepth study on your own house, you
should. You might be surprised. I would plan an all day exercise when
everyone is out of the house.

Mike va3mw

On Tue, Feb 18, 2020 at 2:25 PM Dave Cole <[hidden email]> wrote:

> Hi,
>
> I might suspect something else...
>
> Have you done a power off test of your home yet?
>
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist
> ARRL Asst. Director, NW Division, Technical Resources
>
> On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote:
> > I live about 1.6 miles from some tall antenna towers broadcasting
> digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM
> (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and
> KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to
> use my K3: solid S9+ noise on all bands using a makeshift dipole strung up
> on some trees outside my house. I’ve tried to locate the source of the RFI
> within my home but so far have been unable to locate any RFI emanating from
> within my home. Could it be that the TV/FM stations antenna towers, which
> are within direct line of sight from my house, might be responsible for the
> RFI?
> >
> > 73, Andreas
> >
> > K6AKW
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to [hidden email]
> >
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Fred Nassar

Re: RFI issues

Had a similar issue moving to a new QTH. It turned out to be a bad
transformer in the neighborhood. You could call in an RFI complaint once
you rule out your own QTH and asked them to sniff around.

You can also sniff around with a 2 or 6 meter SSB rig if you have one.

Fred
KE4Q

On Tue, Feb 18, 2020, 5:47 PM Michael Walker <[hidden email]> wrote:

> HI Andreas
>
> Sorry to hear about your noise.
>
> I doubt your noise is related to digital TV as that is a long way away in
> the frequency world. It is pretty common to assume that it is not on your
> own property. I saw one guy who said the same thing and then found out a
> year later it was his new dryer that was noisy even when they were not
> using it.
>
> I would not be surprised that most of your HF noise is within your own
> property unless you did some significant research by holding an AM radio
> near each and every power cube or charger for phones, etc. There are not
> too many that are quiet.
>
> I use my KX2 to find most of my HF noise issues and I must have tossed out
> 15 bad chargers. The ones I could not just toss away, I had to add Mix 31
> chokes to.
>
> When you moved into your new house did you replace all the light bulbs with
> LED bulbs? They can be noisy.
>
> If you haven't taken the time to do an indepth study on your own house, you
> should. You might be surprised. I would plan an all day exercise when
> everyone is out of the house.
>
> Mike va3mw
>
>
> On Tue, Feb 18, 2020 at 2:25 PM Dave Cole <[hidden email]> wrote:
>
> > Hi,
> >
> > I might suspect something else...
> >
> > Have you done a power off test of your home yet?
> >
> > 73, and thanks,
> > Dave (NK7Z)
> > https://www.nk7z.net
> > ARRL Volunteer Examiner
> > ARRL Technical Specialist
> > ARRL Asst. Director, NW Division, Technical Resources
> >
> > On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote:
> > > I live about 1.6 miles from some tall antenna towers broadcasting
> > digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM
> > (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and
> > KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to
> > use my K3: solid S9+ noise on all bands using a makeshift dipole strung
> up
> > on some trees outside my house. I’ve tried to locate the source of the
> RFI
> > within my home but so far have been unable to locate any RFI emanating
> from
> > within my home. Could it be that the TV/FM stations antenna towers, which
> > are within direct line of sight from my house, might be responsible for
> the
> > RFI?
> > >
> > > 73, Andreas
> > >
> > > K6AKW
> > > ______________________________________________________________
> > > Elecraft mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:[hidden email]
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list: http://www.qsl.net/donate.html
> > > Message delivered to [hidden email]
> > >
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Bill Lederer

Re: RFI issues

House we just moved into, we did new under-the-counter lighting. Once I
got the ham shack started, I saw s9 noise on 160 and 80. Turn them off, and
it becomes quiet.

Other led panel lights produce no noise whatsoever.

But now that that is identified, I will be tracking down some other noise,
likely in the neighborhood.

w8lvn

On Tue, Feb 18, 2020 at 5:29 PM Fred Nassar <[hidden email]> wrote:

> Had a similar issue moving to a new QTH. It turned out to be a bad
> transformer in the neighborhood. You could call in an RFI complaint once
> you rule out your own QTH and asked them to sniff around.
>
> You can also sniff around with a 2 or 6 meter SSB rig if you have one.
>
> Fred
> KE4Q
>
> On Tue, Feb 18, 2020, 5:47 PM Michael Walker <[hidden email]> wrote:
>
> > HI Andreas
> >
> > Sorry to hear about your noise.
> >
> > I doubt your noise is related to digital TV as that is a long way away in
> > the frequency world. It is pretty common to assume that it is not on
> your
> > own property. I saw one guy who said the same thing and then found out a
> > year later it was his new dryer that was noisy even when they were not
> > using it.
> >
> > I would not be surprised that most of your HF noise is within your own
> > property unless you did some significant research by holding an AM radio
> > near each and every power cube or charger for phones, etc. There are not
> > too many that are quiet.
> >
> > I use my KX2 to find most of my HF noise issues and I must have tossed
> out
> > 15 bad chargers. The ones I could not just toss away, I had to add Mix
> 31
> > chokes to.
> >
> > When you moved into your new house did you replace all the light bulbs
> with
> > LED bulbs? They can be noisy.
> >
> > If you haven't taken the time to do an indepth study on your own house,
> you
> > should. You might be surprised. I would plan an all day exercise when
> > everyone is out of the house.
> >
> > Mike va3mw
> >
> >
> > On Tue, Feb 18, 2020 at 2:25 PM Dave Cole <[hidden email]> wrote:
> >
> > > Hi,
> > >
> > > I might suspect something else...
> > >
> > > Have you done a power off test of your home yet?
> > >
> > > 73, and thanks,
> > > Dave (NK7Z)
> > > https://www.nk7z.net
> > > ARRL Volunteer Examiner
> > > ARRL Technical Specialist
> > > ARRL Asst. Director, NW Division, Technical Resources
> > >
> > > On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote:
> > > > I live about 1.6 miles from some tall antenna towers broadcasting
> > > digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM
> > > (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and
> > > KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable
> to
> > > use my K3: solid S9+ noise on all bands using a makeshift dipole strung
> > up
> > > on some trees outside my house. I’ve tried to locate the source of the
> > RFI
> > > within my home but so far have been unable to locate any RFI emanating
> > from
> > > within my home. Could it be that the TV/FM stations antenna towers,
> which
> > > are within direct line of sight from my house, might be responsible for
> > the
> > > RFI?
> > > >
> > > > 73, Andreas
> > > >
> > > > K6AKW
> > > > ______________________________________________________________
> > > > Elecraft mailing list
> > > > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > > > Help: http://mailman.qth.net/mmfaq.htm
> > > > Post: mailto:[hidden email]
> > > >
> > > > This list hosted by: http://www.qsl.net
> > > > Please help support this email list: http://www.qsl.net/donate.html
> > > > Message delivered to [hidden email]
> > > >
> > > ______________________________________________________________
> > > Elecraft mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:[hidden email]
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list: http://www.qsl.net/donate.html
> > > Message delivered to [hidden email]
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

--
--w8lvn--
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Keith N6JPA-2

Re: RFI issues

In reply to this post by Elecraft mailing list

Have you inquired at a local ham radio club for help with your RFI/EMI
issues for assistance in finding the problem?

I doubt transmitters 1.6 miles away would create problems for you.

73, Keith, N6JPA

On 2/18/2020 8:29 AM, Andreas Wachter via Elecraft wrote:

Elecraft mailing list

Re: RFI issues

In reply to this post by Elecraft mailing list

Yes, I did run the K3 off of a battery and pulled the main AC breaker. Didn’t make any difference. Thus my suspicion that the RFI is related to the 208 kW ERP TV station (and/or 63 kW EPR FM station) which are within 1.6 miles and in direct line of sight.

73, Andreas K6AKW

> On Feb 18, 2020, at 10:00 AM, Hank <[hidden email]> wrote:
>
>
> Have you tried pulling your main AC breaker and running your K3 on a car battery? That way, you are sure that nothing in your house (switching power supplies, poor mechanical joints, etc.) is creating the noise.
>
>
> I was able to convince my nearest neighbors to shut down their AC panels also after my house seemed "clean".
>
>
> I finally found 2 bad crimped power line connections down the street from my and a home made fence charge at a goat farm about 300yds behind my house through the woods. Another ham and the local power company came and helped. The power company did their work and it cleared up several S units, but something was still there. Riding around with a scanner tuned to 1800kHz (AM mode) with no antenna connected yielded the goat fence. The power company came out with a listening device to verify my findings. I offered to buy the farmer a fence charger from the hardware store, but he went ahead and did it on his own - it really helped having the power company there!!
>
> I still have a neighbor with a noisy plasma TV - an MFJ-1026 with a longwire out the window nulls it out quite well when the TV in on. Eventually the TV will die (I'm hoping).
>
> Good luck!
> Hank
> K4HYJ
>
>
> ----- Original Message -----
> From: Andreas Wachter via Elecraft ([hidden email])
> Date: 02/18/20 12:39
> To: [hidden email]
> Subject: [Elecraft] RFI issues
>
> I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI?
>
> 73, Andreas
>
> K6AKW
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

Bob McGraw - K4TAX

Re: RFI issues

In reply to this post by Michael Walker

One of the first things to try is to operate the station receiver from a
battery, disconnect everything including the external ground, but the
antenna. Then drop the mains breaker to the property. If the noise
changes, then some or part of it is on your property. If the noise does
not change then it is most likely not on your property. Don't forget
about any UPS that you may have on the property.   It must be turned off
as well. Our fiber internet service has a battery back-up at the
demarcation. You may need to unplug that unit as well.

If it is not on your property, I suggest a portable AM radio tuned to
1700 or such if there is not local station on the frequency. Most of
those radios have a rod antenna that is bi-directional. Use it as a
null device as the null will be much more pronounced than trying to peak
the noise.   Headphones or earbuds will help.    You'll need a local /
sub division map. Mark the axis of the radio on the map,   then move
over 100 to 300 yards to the side and do the same. Usually 3 or 4 sites
will have the lines intersect.    You can then move to that location.
Worst case, should you have 2 or more noise sources which are then a
real challenge to chase.

If it is on your property, then drop every individual breaker, bring the
mains back on and observe. Then add one breaker and observe. Add the
next breaker and observe.   Finally you will find the 2 or 3 that
contributes greatly to the noise. Then you can check the devices on
each one.   Don't forget about the doorbell transformer. Those go bad,
make noise, yet the doorbell will still work.

Once the location is known, then contact the property owner or the local
utility. You may have to be persistent with the local utility, move up
the chain of command, but diplomacy along every step goes a long way to
getting something done.

It is also worthwhile to note the day and the times the observations
were made. It could be related to something only furing the day or only
at night or maybe on each Wednesday and Friday etc.

I doubt it is anything from the TV stations.

73

Bob, K4TAX

On 2/18/2020 4:45 PM, Michael Walker wrote:

> HI Andreas
>
> Sorry to hear about your noise.
>
> I doubt your noise is related to digital TV as that is a long way away in
> the frequency world. It is pretty common to assume that it is not on your
> own property. I saw one guy who said the same thing and then found out a
> year later it was his new dryer that was noisy even when they were not
> using it.
>
> I would not be surprised that most of your HF noise is within your own
> property unless you did some significant research by holding an AM radio
> near each and every power cube or charger for phones, etc. There are not
> too many that are quiet.
>
> I use my KX2 to find most of my HF noise issues and I must have tossed out
> 15 bad chargers. The ones I could not just toss away, I had to add Mix 31
> chokes to.
>
> When you moved into your new house did you replace all the light bulbs with
> LED bulbs? They can be noisy.
>
> If you haven't taken the time to do an indepth study on your own house, you
> should. You might be surprised. I would plan an all day exercise when
> everyone is out of the house.
>
> Mike va3mw
>
>
> On Tue, Feb 18, 2020 at 2:25 PM Dave Cole <[hidden email]> wrote:
>
>> Hi,
>>
>> I might suspect something else...
>>
>> Have you done a power off test of your home yet?
>>
>> 73, and thanks,
>> Dave (NK7Z)
>> https://www.nk7z.net
>> ARRL Volunteer Examiner
>> ARRL Technical Specialist
>> ARRL Asst. Director, NW Division, Technical Resources
>>
>> On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote:
>>> I live about 1.6 miles from some tall antenna towers broadcasting
>> digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM
>> (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and
>> KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to
>> use my K3: solid S9+ noise on all bands using a makeshift dipole strung up
>> on some trees outside my house. I’ve tried to locate the source of the RFI
>> within my home but so far have been unable to locate any RFI emanating from
>> within my home. Could it be that the TV/FM stations antenna towers, which
>> are within direct line of sight from my house, might be responsible for the
>> RFI?
>>> 73, Andreas
>>>
>>> K6AKW
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to [hidden email]
>>>
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Bob McGraw - K4TAX

Re: RFI issues

In reply to this post by Elecraft mailing list

Does the noise appear on one band or several bands? Is it tune-able
thus limited to one broad frequency or just total broadband noise?

You will need to know the frequency of both transmitters and then
perform an IM study. The sum of those two frequencies is doubtful but
the difference could be fall in the ham band(s). You can contact the FM
station and the TV station engineering department and inquire as to when
they have transmitter maintenance scheduled. What ever day or hour of
the night that might be, you need to be listening. If it doesn't go
away, it isn't them. If it does, that doesn't assure they are at
fault. I've seen chain link fences make a nice diode junction and it
radiates like crazy.

Here is a link that will simplify the calculations.
http://radiomobile.pe1mew.nl/?RF_Aids:On-Line_calculators:Intermodulation

73

Bob, K4TAX

On 2/18/2020 6:38 PM, Andreas Wachter via Elecraft wrote:

> Yes, I did run the K3 off of a battery and pulled the main AC breaker. Didn’t make any difference. Thus my suspicion that the RFI is related to the 208 kW ERP TV station (and/or 63 kW EPR FM station) which are within 1.6 miles and in direct line of sight.
>
> 73, Andreas K6AKW
>
>> On Feb 18, 2020, at 10:00 AM, Hank <[hidden email]> wrote:
>>
>>
>> Have you tried pulling your main AC breaker and running your K3 on a car battery? That way, you are sure that nothing in your house (switching power supplies, poor mechanical joints, etc.) is creating the noise.
>>
>>
>> I was able to convince my nearest neighbors to shut down their AC panels also after my house seemed "clean".
>>
>>
>> I finally found 2 bad crimped power line connections down the street from my and a home made fence charge at a goat farm about 300yds behind my house through the woods. Another ham and the local power company came and helped. The power company did their work and it cleared up several S units, but something was still there. Riding around with a scanner tuned to 1800kHz (AM mode) with no antenna connected yielded the goat fence. The power company came out with a listening device to verify my findings. I offered to buy the farmer a fence charger from the hardware store, but he went ahead and did it on his own - it really helped having the power company there!!
>>
>> I still have a neighbor with a noisy plasma TV - an MFJ-1026 with a longwire out the window nulls it out quite well when the TV in on. Eventually the TV will die (I'm hoping).
>>
>> Good luck!
>> Hank
>> K4HYJ
>>
>>
>> ----- Original Message -----
>> From: Andreas Wachter via Elecraft ([hidden email])
>> Date: 02/18/20 12:39
>> To: [hidden email]
>> Subject: [Elecraft] RFI issues
>>
>> I live about 1.6 miles from some tall antenna towers broadcasting digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable to use my K3: solid S9+ noise on all bands using a makeshift dipole strung up on some trees outside my house. I’ve tried to locate the source of the RFI within my home but so far have been unable to locate any RFI emanating from within my home. Could it be that the TV/FM stations antenna towers, which are within direct line of sight from my house, might be responsible for the RFI?
>>
>> 73, Andreas
>>
>> K6AKW
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

ke9uw

Re: RFI issues

In reply to this post by Bill Lederer

We bought a new Keurig coffee maker which does a pot or also the pods. It puts a huge noise out to the ham frequencies. Have to turn it off to get on 80M

Chuck Jack Hawley
KE9UW

Sent from my iPhone, cjack

> On Feb 18, 2020, at 5:51 PM, Bill Lederer <[hidden email]> wrote:
>
> House we just moved into, we did new under-the-counter lighting. Once I
> got the ham shack started, I saw s9 noise on 160 and 80. Turn them off, and
> it becomes quiet.
>
> Other led panel lights produce no noise whatsoever.
>
> But now that that is identified, I will be tracking down some other noise,
> likely in the neighborhood.
>
> w8lvn
>
>> On Tue, Feb 18, 2020 at 5:29 PM Fred Nassar <[hidden email]> wrote:
>>
>> Had a similar issue moving to a new QTH. It turned out to be a bad
>> transformer in the neighborhood. You could call in an RFI complaint once
>> you rule out your own QTH and asked them to sniff around.
>>
>> You can also sniff around with a 2 or 6 meter SSB rig if you have one.
>>
>> Fred
>> KE4Q
>>
>>> On Tue, Feb 18, 2020, 5:47 PM Michael Walker <[hidden email]> wrote:
>>>
>>> HI Andreas
>>>
>>> Sorry to hear about your noise.
>>>
>>> I doubt your noise is related to digital TV as that is a long way away in
>>> the frequency world. It is pretty common to assume that it is not on
>> your
>>> own property. I saw one guy who said the same thing and then found out a
>>> year later it was his new dryer that was noisy even when they were not
>>> using it.
>>>
>>> I would not be surprised that most of your HF noise is within your own
>>> property unless you did some significant research by holding an AM radio
>>> near each and every power cube or charger for phones, etc. There are not
>>> too many that are quiet.
>>>
>>> I use my KX2 to find most of my HF noise issues and I must have tossed
>> out
>>> 15 bad chargers. The ones I could not just toss away, I had to add Mix
>> 31
>>> chokes to.
>>>
>>> When you moved into your new house did you replace all the light bulbs
>> with
>>> LED bulbs? They can be noisy.
>>>
>>> If you haven't taken the time to do an indepth study on your own house,
>> you
>>> should. You might be surprised. I would plan an all day exercise when
>>> everyone is out of the house.
>>>
>>> Mike va3mw
>>>
>>>
>>>> On Tue, Feb 18, 2020 at 2:25 PM Dave Cole <[hidden email]> wrote:
>>>
>>>> Hi,
>>>>
>>>> I might suspect something else...
>>>>
>>>> Have you done a power off test of your home yet?
>>>>
>>>> 73, and thanks,
>>>> Dave (NK7Z)
>>>> https://www.nk7z.net
>>>> ARRL Volunteer Examiner
>>>> ARRL Technical Specialist
>>>> ARRL Asst. Director, NW Division, Technical Resources
>>>>
>>>> On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote:
>>>>> I live about 1.6 miles from some tall antenna towers broadcasting
>>>> digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM
>>>> (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and
>>>> KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable
>> to
>>>> use my K3: solid S9+ noise on all bands using a makeshift dipole strung
>>> up
>>>> on some trees outside my house. I’ve tried to locate the source of the
>>> RFI
>>>> within my home but so far have been unable to locate any RFI emanating
>>> from
>>>> within my home. Could it be that the TV/FM stations antenna towers,
>> which
>>>> are within direct line of sight from my house, might be responsible for
>>> the
>>>> RFI?
>>>>>
>>>>> 73, Andreas
>>>>>
>>>>> K6AKW
>>>>> ______________________________________________________________
>>>>> Elecraft mailing list
>>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>> Post: mailto:[hidden email]
>>>>>
>>>>> This list hosted by: http://www.qsl.net
>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>> Message delivered to [hidden email]
>>>>>
>>>> ______________________________________________________________
>>>> Elecraft mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:[hidden email]
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>> Message delivered to [hidden email]
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to [hidden email]
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
>
>
>
> --
> --w8lvn--
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

Chuck, KE9UW

NK7Z

Re: RFI issues

Thanks, I was considering one of those...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist
ARRL Asst. Director, NW Division, Technical Resources

On 2/18/20 7:55 PM, hawley, charles j jr wrote:

> We bought a new Keurig coffee maker which does a pot or also the pods. It puts a huge noise out to the ham frequencies. Have to turn it off to get on 80M
>
> Chuck Jack Hawley
> KE9UW
>
> Sent from my iPhone, cjack
>
>> On Feb 18, 2020, at 5:51 PM, Bill Lederer <[hidden email]> wrote:
>>
>> House we just moved into, we did new under-the-counter lighting. Once I
>> got the ham shack started, I saw s9 noise on 160 and 80. Turn them off, and
>> it becomes quiet.
>>
>> Other led panel lights produce no noise whatsoever.
>>
>> But now that that is identified, I will be tracking down some other noise,
>> likely in the neighborhood.
>>
>> w8lvn
>>
>>> On Tue, Feb 18, 2020 at 5:29 PM Fred Nassar <[hidden email]> wrote:
>>>
>>> Had a similar issue moving to a new QTH. It turned out to be a bad
>>> transformer in the neighborhood. You could call in an RFI complaint once
>>> you rule out your own QTH and asked them to sniff around.
>>>
>>> You can also sniff around with a 2 or 6 meter SSB rig if you have one.
>>>
>>> Fred
>>> KE4Q
>>>
>>>> On Tue, Feb 18, 2020, 5:47 PM Michael Walker <[hidden email]> wrote:
>>>>
>>>> HI Andreas
>>>>
>>>> Sorry to hear about your noise.
>>>>
>>>> I doubt your noise is related to digital TV as that is a long way away in
>>>> the frequency world. It is pretty common to assume that it is not on
>>> your
>>>> own property. I saw one guy who said the same thing and then found out a
>>>> year later it was his new dryer that was noisy even when they were not
>>>> using it.
>>>>
>>>> I would not be surprised that most of your HF noise is within your own
>>>> property unless you did some significant research by holding an AM radio
>>>> near each and every power cube or charger for phones, etc. There are not
>>>> too many that are quiet.
>>>>
>>>> I use my KX2 to find most of my HF noise issues and I must have tossed
>>> out
>>>> 15 bad chargers. The ones I could not just toss away, I had to add Mix
>>> 31
>>>> chokes to.
>>>>
>>>> When you moved into your new house did you replace all the light bulbs
>>> with
>>>> LED bulbs? They can be noisy.
>>>>
>>>> If you haven't taken the time to do an indepth study on your own house,
>>> you
>>>> should. You might be surprised. I would plan an all day exercise when
>>>> everyone is out of the house.
>>>>
>>>> Mike va3mw
>>>>
>>>>
>>>>> On Tue, Feb 18, 2020 at 2:25 PM Dave Cole <[hidden email]> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I might suspect something else...
>>>>>
>>>>> Have you done a power off test of your home yet?
>>>>>
>>>>> 73, and thanks,
>>>>> Dave (NK7Z)
>>>>> https://www.nk7z.net
>>>>> ARRL Volunteer Examiner
>>>>> ARRL Technical Specialist
>>>>> ARRL Asst. Director, NW Division, Technical Resources
>>>>>
>>>>> On 2/18/20 8:29 AM, Andreas Wachter via Elecraft wrote:
>>>>>> I live about 1.6 miles from some tall antenna towers broadcasting
>>>>> digital TV (KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM
>>>>> (KWPZ-FM) at 63 kW ERP on 106.5MHz - according to FCC info on KBCB and
>>>>> KWPZ-FM. Ever since I moved to this QTH a few months ago, I am unable
>>> to
>>>>> use my K3: solid S9+ noise on all bands using a makeshift dipole strung
>>>> up
>>>>> on some trees outside my house. I’ve tried to locate the source of the
>>>> RFI
>>>>> within my home but so far have been unable to locate any RFI emanating
>>>> from
>>>>> within my home. Could it be that the TV/FM stations antenna towers,
>>> which
>>>>> are within direct line of sight from my house, might be responsible for
>>>> the
>>>>> RFI?
>>>>>>
>>>>>> 73, Andreas
>>>>>>
>>>>>> K6AKW
>>>>>> ______________________________________________________________
>>>>>> Elecraft mailing list
>>>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>>> Post: mailto:[hidden email]
>>>>>>
>>>>>> This list hosted by: http://www.qsl.net
>>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>>> Message delivered to [hidden email]
>>>>>>
>>>>> ______________________________________________________________
>>>>> Elecraft mailing list
>>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>> Post: mailto:[hidden email]
>>>>>
>>>>> This list hosted by: http://www.qsl.net
>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>> Message delivered to [hidden email]
>>>> ______________________________________________________________
>>>> Elecraft mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:[hidden email]
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>> Message delivered to [hidden email]
>>> ______________________________________________________________
>>> Elecraft mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:[hidden email]
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> Message delivered to [hidden email]
>>
>>
>>
>> --
>> --w8lvn--
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

ANDY DURBIN

RFI issues

In reply to this post by Elecraft mailing list

I recently had an intermittent high noise level on 6 m band and there seemed to be a correlation with activity at my neighbors house. I ran a PC application that showed my transceiver's S meter and remoted my PC desktop to my Android phone with TeamViewer.

Next time my neighbor was working in his garage, and the noise was present, I went over and explained my noise problem. I asked him him to shut off his garage lights one group at a time while we monitored the noise level on my Android phone. The noise was traced to one group of florescent lights and was completely gone when that light group was disconnected.

I think it was a big advantage to be able to show him there was a direct correlation between my noise level and his lighting. He agreed to keep that light group disconnected and said he would replace them later. Just a few days after resolving the noise problem I worked Alaska to complete 6 m WAS.

73,
Andy, k3wyc
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

George Danner-2

Re: RFI issues

In reply to this post by Elecraft mailing list

Andreas,
You might want to go to the station and talk the the Chief Engineer. If he
is the nice-guygal type CE he will help you (Not al CEs are the nice kind
but most are).

I'd suggest that he/she cycle the two transmitters on/off while you are at
your station. He/She won't do that during the early news but might at 2 or 3
AM. It is worth a try.

Long ago - I had the opposite issue when ham transmitters interfered with TV
receivers. Some people call the TV station to resolve the issue. Most of the
time it came down to who was going to buy the filter. At any given time we
probably had 10 filters on the shelf.

One point - TV (especially UHF) antennas tend to fairly high gain. The
pattern tends to be omnidirectional horizontally. The gain is in the
vertical plane. Much of the transmitted power is well above 10° (probably
much higher). The FM antenna gain depends on the size transmitter. Usually
they tend to use lower gain than TV antennas.

In a spectrum analyzer - the digital TV looks like high power noise. The
signal should square corners on both ends of the occupied spectrum.

73
George AI4VZ

-----Original Message-----
From: Andreas Wachter via Elecraft
I live about 1.6 miles from some tall antenna towers broadcasting digital TV
(KBCB) at 208 kW ERP on channel 19 (500 - 506 MHz) and on FM (KWPZ-FM) at 63
kW ERP on 106.5MHz - according to FCC info on KBCB and KWPZ-FM. Ever since I
moved to this QTH a few months ago, I am unable to use my K3: solid S9+
noise on all bands using a makeshift dipole strung up on some trees outside
my house. I’ve tried to locate the source of the RFI within my home but so
far have been unable to locate any RFI emanating from within my home. Could
it be that the TV/FM stations antenna towers, which are within direct line
of sight from my house, might be responsible for the RFI?

73, Andreas

K6AKW

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Elecraft mailing list

Re: RFI issues

In reply to this post by Elecraft mailing list

Andreas, TV transmitters at 500 MHz +- are really not noise disrupters in our amateur HF world. In fact, in our AREDN mesh work in LA, we’ve found that Ubiquiti sector antennas at 3 GHz and 5 GHz producing just milliwatts of power play nicely next to commercial TV transmitters generating 1.5-million watts at 500 MHz. So it’s something else.
A few years ago, I was on a similar RF noise hunt in my systems which reside in central LA, an RF noisy place. Some things I learned:
1) Pay close attention to how your power supply is connected. Use shielded twisted pair wiring from your power supply to your radio, and do not use red-black zip line. Unless twisted, that untwisted cable becomes an excellent antenna delivering noise to your system. In fact, pay attention to all cables. Make sure they are shielded.
2) Hunt for noise makers. At that time I made the really dumb mistake of having two touch lamps near my radios — ya know, ya hit the base to raise or lower brightness. Those things will make noise for miles. Away they went.
3) Older plasma flat screens (pre-LCD) are noise makers. Most light dimmers. Someone even had a coffee maker with a loose heating coil connection that was through the roof with noise.
4) In my hunt for noise makers, I used an aircraft band hand-held receiver (that’s AM), squelch off, and just walk around touching the antenna to things.. Eye opening. Ya know what my biggest noise maker was near my radios?! My D-Link switch which lives under the desk not 3 feet from my HF radio. Further all of those CAT6 cables were great little antennas just spreading that noise all over. Solution: feed the switch highly filtered power and change all cables to CAT7 which is heavily shielded CAT6. Made a big difference.
5) Ferrite beads, clamp-ons. Get a bunch. Put them on every cable. Double up on the coax. Keep standing waves away. You want to discourage RF from traveling in places where it should not go. Ferrites are wonderful. Get 'em on Amazon.
6) Grounding. There are several well-known AC filtering devices that can add an extra ground to your AC mains coming into your radios.
7) Switching power supplies. Those wall-worts. Noisy beasts. Best to use a centralized, filtered 12V DC system that eliminates those wall worts altogether. One of the worst noise makers near my radios was a lovely, beautiful LG display which could not be plugged into my highly filtered and shielded 12V DC system because they run own 24V. Switched it out with a nice Samsung which runs on 12V and it runs totally quiet.
Good luck. The hunt may take a while But these steps took my urban noise from S7 to S1. Was worth the time.

David Ahrendts, KK6DA, Los Angeles
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [hidden email]

Wes Stewart-2

Re: RFI issues

In reply to this post by NK7Z

Me too. I was just complaining to my XYL about having to fill the bean grinder,
grind the beans, and water the brewer and suggested getting one. They use them
in her law office but she said no, she likes fresh ground. I guess this ends
that idea.

Wes N7WS

On 2/19/2020 5:17 AM, Dave Cole wrote:

> Thanks, I was considering one of those...
>
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist
> ARRL Asst. Director, NW Division, Technical Resources
>
> On 2/18/20 7:55 PM, hawley, charles j jr wrote:
>> We bought a new Keurig coffee maker which does a pot or also the pods. It
>> puts a huge noise out to the ham frequencies. Have to turn it off to get on 80M
>>
>> Chuck Jack Hawley
>> KE9UW

k6dgw

Re: RFI issues

FWIW: We recently gave up the grinder, we found that the very fine
ground in the store made much better coffee than what we could get from
whole beans in our grinder.

73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County

On 2/19/2020 1:31 PM, Wes wrote:

> Me too. I was just complaining to my XYL about having to fill the
> bean grinder, grind the beans, and water the brewer and suggested
> getting one. They use them in her law office but she said no, she
> likes fresh ground. I guess this ends that idea.
>
> Wes N7WS
>
> On 2/19/2020 5:17 AM, Dave Cole wrote:
>> Thanks, I was considering one of those...
>>
>> 73, and thanks,
>> Dave (NK7Z)
>> https://www.nk7z.net
>> ARRL Volunteer Examiner
>> ARRL Technical Specialist
>> ARRL Asst. Director, NW Division, Technical Resources
>>
>> On 2/18/20 7:55 PM, hawley, charles j jr wrote:
>>> We bought a new Keurig coffee maker which does a pot or also the
>>> pods. It puts a huge noise out to the ham frequencies. Have to turn
>>> it off to get on 80M
>>>
>>> Chuck Jack Hawley
>>> KE9UW
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

123