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K3 and wireless intruder alarm

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David Andrews-3

K3 and wireless intruder alarm

I'm thinking of installing a wireless home security system running on 868
MHz (FM). I run up to 100 watts through the built-in ATU, into an Elecraft
balun, open wire feeder and 88ft dipole at 30ft. Has anyone any experience
they can share please? Am I likely to trigger the alarm?

Thanks

David G4CWB

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David Christ

Re: K3 and wireless intruder alarm

Both I and K0CF have wireless home security systems that I think run on 900 MHz or so. We both run in excess of 500 watts to K4KIO hexagonal beams at 35 to 40 feet. Our towers are bracket to the house. Neither of us have experienced any problems.

David K0LUM

On Jul 13, 2013, at 12:25 PM, David Andrews wrote:

> I'm thinking of installing a wireless home security system running on 868
> MHz (FM). I run up to 100 watts through the built-in ATU, into an Elecraft
> balun, open wire feeder and 88ft dipole at 30ft. Has anyone any experience
> they can share please? Am I likely to trigger the alarm?
>
>
>
> Thanks
>
>
>
> David G4CWB
>
> ______________________________________________________________
> 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

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Jim Brown-10

Re: K3 and wireless intruder alarm

In reply to this post by David Andrews-3

On 7/13/2013 10:25 AM, David Andrews wrote:
> Am I likely to trigger the alarm?

Alarm systems in general, at least in North America, are notoriously bad
for RF susceptibility. The coupling mechanisms are primarily poorly
filtered signal wiring, Pin One Problems, poor circuit layout, and poor
shielding. To the extent that it has less external wiring, a wireless
system MIGHT be less problematic, but those other mechanisms are still
there. Suppression methods are addressed in http://k9yc.com/RFI-Ham.pdf

73, Jim K9YC
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David Christ

Re: K3 and wireless intruder alarm

Don't know what his system will be like, but the system I have as absolutely no wiring between any of the components. Everything is wireless. Experience of two of us has been no problems while running high power levels using good equipment into well designed antennas.

These data points only involve one brand of security system however.

David K0LUM
On Jul 13, 2013, at 12:37 PM, Jim Brown wrote:

> On 7/13/2013 10:25 AM, David Andrews wrote:
>> Am I likely to trigger the alarm?
>
> Alarm systems in general, at least in North America, are notoriously bad for RF susceptibility. The coupling mechanisms are primarily poorly filtered signal wiring, Pin One Problems, poor circuit layout, and poor shielding. To the extent that it has less external wiring, a wireless system MIGHT be less problematic, but those other mechanisms are still there. Suppression methods are addressed in http://k9yc.com/RFI-Ham.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

Jim Bennett

Re: K3 and wireless intruder alarm

In reply to this post by David Andrews-3

David,

I suspect that you'll probably be OK going wireless, especially running only 100 watts. Our security system is about 22 years old and is a WIRED system, meaning a lot of wires (antennas!) running through the walls of our two story home. With my K3 running barefoot at 100 watts, I experienced NO interference to the system when using either my ground mounted Hustler 5BTV or my 88-foot long doublet at 40 feet. However, when I purchased the KPA500 and ran 500+ watts to the vertical, it was a different story. Had lots of interference to the security system and a few other in-home devices. I wound up placing several ferrite beads on each end of every wire going into the control box of the security system - a couple at the box, and a couple more at the "operator panels" on the doors. Seemed to resolve the problem. With your wireless system, you "shouldn't" have those problems at 100 watts. If you get an amp, all bets are off!!!

73 & GL, Jim / W6JHB

On Saturday, Jul 13, 2013, at Saturday, 10:25 AM, David Andrews wrote:

Reginald J Mackey SR-3

Re: K3 and wireless intruder alarm

In reply to this post by Jim Brown-10

We have ADT wireless and no problems

Reggie k6xr
Amateur radio 58 years
DXCC, RCC, WAC

Sent from my iPad

On Jul 13, 2013, at 10:37 AM, Jim Brown <[hidden email]> wrote:

Keith Heimbold

Re: K3 and wireless intruder alarm

I have Protection 1 and noticed an increase in noise level once the system was installed especially on 6m. I moved my antenna from above the house to my tower that is away from the house and the noise reduced significantly. Other bands did not seem as affected. The antenna was above my house and not far from other homes and residences so this might be coincidental to my neighbor installing a new plasma or something like that too.

Good luck!

Keith
AK6ZZ

Sent from my iPhone please excuse typos

On Jul 13, 2013, at 11:01 AM, "Reginald J Mackey SR" <[hidden email]> wrote:

> We have ADT wireless and no problems
>
> Reggie k6xr
> Amateur radio 58 years
> DXCC, RCC, WAC
>
> Sent from my iPad
>
> On Jul 13, 2013, at 10:37 AM, Jim Brown <[hidden email]> wrote:
>
>> On 7/13/2013 10:25 AM, David Andrews wrote:
>>> Am I likely to trigger the alarm?
>>
>> Alarm systems in general, at least in North America, are notoriously bad for RF susceptibility. The coupling mechanisms are primarily poorly filtered signal wiring, Pin One Problems, poor circuit layout, and poor shielding. To the extent that it has less external wiring, a wireless system MIGHT be less problematic, but those other mechanisms are still there. Suppression methods are addressed in http://k9yc.com/RFI-Ham.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
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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>
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> Please help support this email list: http://www.qsl.net/donate.html

Steve Glickstein

Re: K3 and wireless intruder alarm

In reply to this post by David Andrews-3

I've used a wireless home alarm system for 13 years with hf/vhf/uhf
antennas in the attic of a 3 story townhouse. The documentation doesn't
include specs. The antenna on the master unit is approximately 13 cm.
Depending on whether that's a quarter wave or full wave, it's in the
bottom or top of the microwaves. Using my K3 at 100w all bands doesn't
affect the system. Running 50w on 70cm does affect my 5.8 GHz wireless
telephone system. I'm guessing that it's crunching the receiver front
end or getting rfi into the master's control circuitry.

73, Steve W4FMD

On 7/13/2013 1:25 PM, David Andrews wrote:

KE8G

Re: K3 and wireless intruder alarm

In reply to this post by David Andrews-3

My alarm system uses a combination of wires, for the doors, and wireless for all windows and motion detectors. I usually run the K3 with the KPA500 at around 450-500 watts and have no problems whatsoever!

73 de Jim - KE8G

---- David Christ <[hidden email]> wrote:

> Both I and K0CF have wireless home security systems that I think run on 900 MHz or so. We both run in excess of 500 watts to K4KIO hexagonal beams at 35 to 40 feet. Our towers are bracket to the house. Neither of us have experienced any problems.
>
> David K0LUM
>
> On Jul 13, 2013, at 12:25 PM, David Andrews wrote:
>
> > I'm thinking of installing a wireless home security system running on 868
> > MHz (FM). I run up to 100 watts through the built-in ATU, into an Elecraft
> > balun, open wire feeder and 88ft dipole at 30ft. Has anyone any experience
> > they can share please? Am I likely to trigger the alarm?
> >
> >
> >
> > Thanks
> >
> >
> >
> > David G4CWB
> >
> > ______________________________________________________________
> > 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
>
> ______________________________________________________________
> 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