[Elecraft] K3 RFI in transmitted audio

[Jorge Diez - CX6VM]

I experimented a problem during WAE contest this weekend.

I was working OK till this afternoon. When I transmit, N1MM freeze, and I
need to rebbot my computer.

I tried many things, change USB port of the USB interface, switch off amp,
etc.

When I wanted to check the RS232 in the back of the K3 I noticed that the
ground was disconnected (I removed recently the K3 from this position, and
seems I forgot to connect it again).

After I connect the ground to the K3 all started working properly right
again..!

That´s why a good ground is necessary!...

73,
Jorge
CX6VM/CW5W



-----Mensaje original-----
De: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] En nombre de Don Wilhelm
Enviado el: Domingo, 12 de Septiembre de 2010 05:38 p.m.
Para: Jim Brown
CC: elecraft at mailman.qth.net
Asunto: Re: [Elecraft] K3 RFI in transmitted audio

  Jim,

Sorry about my phrasing, I did not mean to imply that it was strange 
that the varying V- current would cause modulation, it can and it will.

What I intended to say was that the modulation itself might appear 
"strange", and may not be recognized as mmodulation at all.

73,
Don W3FPR

On 9/12/2010 12:34 PM, Jim Brown wrote:
>
> Don said:
>
>> Strange modulation of the V- line to the accessory can result,
>> especially with SSB transmission,
> Nothing strange about it, it's simple Ohm's Law. :)  You have DC
> current on the V- lead that reaches a peak value of at least 20A, so
> there is voltage drop on that lead as predicted by Ohm's Law.
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