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14.316 help!

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Milton-3

Re: 14.316 help!

I would suggest that this RFI is coming from a "Rife Bare Device" and not
a old analog TV set.

We have the same thing in the DFW area.

Milton
AD5XD

--- On Sun, 4/24/11, Jack Brindle <[hidden email]> wrote:

> From: Jack Brindle <[hidden email]>
> Subject: Re: [Elecraft] 14.316 help!
> To: "Elecraft Reflector" <[hidden email]>
> Date: Sunday, April 24, 2011, 8:57 PM
> It could also be another device that
> uses a crystal frequency of 14.31818 MHz. That is also a
> very popular Microcontroller frequency.
> You might also want to look at the computer video card
> since it probably generates this frequency. Maintaining a
> very stable frequency is much easier when you divide down
> from a stable source. If you have an RGB monitor, especially
> one that is CRT-based, then this is a likely culprit.
>
> Jack Brindle, W6FB
>
> On Apr 24, 2011, at 5:02 PM, Phil Kane wrote:
>
> > On 4/24/2011 1:39 PM, Grant Youngman wrote:
> >
> >>> I don't have the problem on the 2nd or 3rd
> harmonic of 3579 KHz,
> >>> but do on have a tone between about 14.316 and
> 14.318 MHz.
> >
> >> It's the 4th harmonic
> >
> > Digital TV receivers do not use a 3.57954528+
> MHz subcarrier
> > like NTSC (analog) receivers do. In digital TV
> protocols color
> > information is carried in the digital data
> stream.
> >
> > -- 73 de K2ASP - Phil Kane
> > Elecraft K2/100 s/n
> 5402
> >
> >
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Rich Heineck

Re: 14.316 help!

In reply to this post by Jim-2

14.318 Mhz has been widely used on PC motherboards going back to the original IBM PC-AT.
That would be high on my list of suspicious sources.

73,
Rich AC7MA

On 4/24/2011 12:56 PM, Jim wrote:

> That tone has been there for years. As long as I remember.
>
>
>
> 73 de Ke4wy Jim
>
> Sent from my compound.
>
>
> On Apr 24, 2011, at 3:38 PM, Grant Youngman<[hidden email]> wrote:
>
>> I've had a weak 'carrier' in this spot for years. Used to have to endure it for the Icom Net at 14.317 in the old days. No clue what it is.
>>
>> Grant/NQ5T
>>
>> Sent from my iPhone
>>
>> On Apr 24, 2011, at 2:29 PM, Fred Jensen<[hidden email]> wrote:
>>
>>> Mine is at 14317.00 and is moderately weak. I
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kevinr@coho.net

Re: 14.316 help!

Which crystal frequency did they use on the IBM PCs before the AT came out?
Kevin. KD5ONS

On Sun, 24 Apr 2011 22:09:17 -0700, Rich Heineck <[hidden email]>
wrote:

> 14.318 Mhz has been widely used on PC motherboards going back to the
> original IBM PC-AT.
> That would be high on my list of suspicious sources.
>
> 73,
> Rich AC7MA
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Jeff Cochrane - VK4XA

Re: 14.316 help!

CONTENTS DELETED

The author has deleted this message.

Rich Heineck

Re: 14.316 help!

In reply to this post by kevinr@coho.net

I just checked, and it looks like even the original 8088 IBM PC had a 14.318 MHz
oscillator on it. And it's also one of the ISA bus signals.

Rich AC7MA

On 4/24/2011 10:17 PM, Kevin Rock wrote:

> Which crystal frequency did they use on the IBM PCs before the AT came out?
> Kevin. KD5ONS
>
>
>
> On Sun, 24 Apr 2011 22:09:17 -0700, Rich Heineck<[hidden email]>
> wrote:
>
>> 14.318 Mhz has been widely used on PC motherboards going back to the
>> original IBM PC-AT.
>> That would be high on my list of suspicious sources.
>>
>> 73,
>> Rich AC7MA
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Edward R Cole

Re: 14.316 help!

In reply to this post by John Cooper

So could one insert a trap on 3.579 MHz to notch the offender? Are
the harmonics generated inside the receiver or where?

73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 50-1.1kW?, 144-1.4kw, 432-100w, 1296-testing*, 3400-?
DUBUS Magazine USA Rep [hidden email]
======================================
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Jim Wiley-2

Re: 14.316 help!

No, a 3.579 trap would indeed notch out the fundamental,. but not the
harmonics. Those signals are coming in on your antenna. For any of a
number of reasons, the 14 MHz versions of the interference are more
prevalent. Consider that 20 meter signals propagate more easily from
home wiring than do 80 meter signals, plus the aforementioned fact that
many computer cards use the 14.318 frequency directly. A 80 meter trap
certainly won't affect those. As a rule, a person can find any number
of signals scattered across the entire 14.315 to 14.319 range. Yes,
they are crystal controlled, but the crystals themselves are not
necessarily that accurate - in many cases, "close" is good enough, and a
lot cheaper.

- Jim,. KL7CC

Edward R. Cole wrote:

> So could one insert a trap on 3.579 MHz to notch the offender? Are
> the harmonics generated inside the receiver or where?
>
>
> 73, Ed - KL7UW, WD2XSH/45
> ======================================
> BP40IQ 500 KHz - 10-GHz www.kl7uw.com
> EME: 50-1.1kW?, 144-1.4kw, 432-100w, 1296-testing*, 3400-?
> DUBUS Magazine USA Rep [hidden email]
> ======================================
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Post: mailto:[hidden email]
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>
>

Gary Gregory

Re: 14.316 help!

Hmmmm, now that the topic has been beaten to death, perhaps a simple
solution would be to change the 20M net frequency ?

Then perhaps the traffic on the reflector will be reduced to the normal
level of pandemonium?

:-)

73's
Gary

On 25 April 2011 17:19, Jim Wiley <[hidden email]> wrote:

>
>
> No, a 3.579 trap would indeed notch out the fundamental,. but not the
> harmonics. Those signals are coming in on your antenna. For any of a
> number of reasons, the 14 MHz versions of the interference are more
> prevalent. Consider that 20 meter signals propagate more easily from
> home wiring than do 80 meter signals, plus the aforementioned fact that
> many computer cards use the 14.318 frequency directly. A 80 meter trap
> certainly won't affect those. As a rule, a person can find any number
> of signals scattered across the entire 14.315 to 14.319 range. Yes,
> they are crystal controlled, but the crystals themselves are not
> necessarily that accurate - in many cases, "close" is good enough, and a
> lot cheaper.
>
>
> - Jim,. KL7CC
>
>
>
> Edward R. Cole wrote:
> > So could one insert a trap on 3.579 MHz to notch the offender? Are
> > the harmonics generated inside the receiver or where?
> >
> >
> > 73, Ed - KL7UW, WD2XSH/45
> > ======================================
> > BP40IQ 500 KHz - 10-GHz www.kl7uw.com
> > EME: 50-1.1kW?, 144-1.4kw, 432-100w, 1296-testing*, 3400-?
> > DUBUS Magazine USA Rep [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
> >
> >
> ______________________________________________________________
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--

VK4FD - Motorhome Mobile
Elecraft Equipment
K3 #679, KPA-500 #018
Living the dream!!!
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Brendan Minish

Re: 14.316 help!

In reply to this post by Jim-2

Almost every computer and device with an Ethernet interface has a clock
running at 14.316MHz

--
73
Brendan EI6IZ

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Alexander Sack

Re: 14.316 help!

In reply to this post by Gary Gregory

On Mon, Apr 25, 2011 at 4:19 AM, Gary Gregory <[hidden email]> wrote:
> Hmmmm, now that the topic has been beaten to death, perhaps a simple
> solution would be to change the 20M net frequency ?

I certainly would appreciate it. The current frequency in use is
untenable for me.

73

-aps
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Eric Swartz - WA6HHQ

Re: 14.316 help! [END of Thread]

Administrator

In reply to this post by Brendan Minish

Folks, let's end this thread now.

73, Eric
list moderator
----

On 4/25/2011 2:42 AM, Brendan Minish wrote:
> Almost every computer and device with an Ethernet interface has a clock
> running at 14.316MHz
>
>
>
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