[Elecraft] TV and computer interferencies - K3's fault ?

[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
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