TV and computer interferencies - K3's fault ?

[David Quental]

Hello all,

yesterday evening I was calling on 17m when a lady warned me that I was
doing interferencies on her TV and computer. According to our ham law
when another Comm service claims against a ham interference we should
stop our activity until our Portuguese FCC cames and check ham
conditions here. She did not clarify me, and I did not ask, what was
wrong with computer. I know that she has a cable tv connection, but for
sure her TV-set was disconnected from cable system.

So I stopped and after a phone to CT4RK he advised me to stop my TXs and
call Portuguese FCC technicians. During our phone conversation he said
that deeply doubts that cause of interferencies could be due K3.
According to your K3 experiency could you say me if could be possible
that rig could cause that type of interferencies ???

My actual HF antenna is a 7m long simple wire attached to a 1:9 balun in
a spiderbeam pole through my window, very near building as you could
imagine.

Best regards.

CT1DRB
David Quental




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[David Woolley (E.L)]

Computers should not be affected by transmitter faults.  TVs used to be,
but assuming you have UHF TV, that is less likely these days.  Pure
cable TV should not be affected by all but extreme faults.

The problem is most likely to be a combination of poor (read cost
cutting) design in the affected equipment and your use of a transmit
power that is too high given the location of the antenna.  In the case
of the TV, design in the equipment may include the use of an
inappropriate antenna given the (lack of) strength of signals in the
area.  The location of the antenna may include its general closeness,
but could also include things like running parallel to critical wiring.

Note that consumer electronics doesn't have to be completely immune to
nearby radio transmitters; that would be impossible and legislation will
make a big tradeoff between cost and immunity.  Intentional receivers,
like TVs will be particularly vulnerable, even for out of band
transmissions.

If you place it close enough, even the less than one watt from a PMR 446
transmitterhalf watt can upset consumer electronics (and even the
Elecraft K2).

I would hope all of this was covered by the Portuguese amateur radio
examinations.

David Quental wrote:
>
> yesterday evening I was calling on 17m when a lady warned me that I was
> doing interferencies on her TV and computer. According to our ham law
> According to your K3 experiency could you say me if could be possible
> that rig could cause that type of interferencies ???
>
> My actual HF antenna is a 7m long simple wire attached to a 1:9 balun in
> a spiderbeam pole through my window, very near building as you could
> imagine.


--
David Woolley
"we do not overly restrict the subject matter on the list, and we
encourage postings on a wide range of amateur radio related topics"
List Guidelines <http://www.elecraft.com/elecraft_list_guidelines.htm>
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[Pete Smith N4ZR]

I'm just guessing here, but it almost certainly is not a K3-specific
problem.  Why not take this query to the excellent reflector
[hidden email] ?

73, Pete N4ZR

The World Contest Station Database, updated daily at www.conteststations.com
The Reverse Beacon Network at http://reversebeacon.net, blog at reversebeacon.blogspot.com


On 5/18/2010 5:08 PM, David Quental wrote:

> Hello all,
>
> yesterday evening I was calling on 17m when a lady warned me that I was
> doing interferencies on her TV and computer. According to our ham law
> when another Comm service claims against a ham interference we should
> stop our activity until our Portuguese FCC cames and check ham
> conditions here. She did not clarify me, and I did not ask, what was
> wrong with computer. I know that she has a cable tv connection, but for
> sure her TV-set was disconnected from cable system.
>
> So I stopped and after a phone to CT4RK he advised me to stop my TXs and
> call Portuguese FCC technicians. During our phone conversation he said
> that deeply doubts that cause of interferencies could be due K3.
> According to your K3 experiency could you say me if could be possible
> that rig could cause that type of interferencies ???
>
> My actual HF antenna is a 7m long simple wire attached to a 1:9 balun in
> a spiderbeam pole through my window, very near building as you could
> imagine.
>
> Best regards.
>
> CT1DRB
> David Quental
>
>
>
>
> ______________________________________________________________
> 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]

On Tue, 18 May 2010 22:08:22 +0100, David Quental wrote:

>yesterday evening I was calling on 17m when a lady warned me that I was
>doing interferencies on her TV and computer.

http://audiosystemsgroup.com/RFI-Ham.pdf

73,

Jim K9YC



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