[Elecraft] K3/100 RF Feedback/Spurious oscillations ?

[Bill W5WVO]

Any chance that part of the RF getting in through the RX antenna connection is 
common-mode? If so, a simple ferrite toroid choke might solve the problem. 
Probably not, but I'd try that first, just because it's such a simple fix.

Bill W5WVO


Andrew Faber wrote:
> Toby,
>  Yes, that is a sensible way to do it.  Does anyone have a simple
> circuit for this in an SO2R setup, where you would need to ground the
> RX input to the transmitting radio without grounding the receiving
> antenna that might also be connected to the second radio?
>  73, andy, ae6y
> ----- Original Message -----
> From: <dj7mgq at muenchen-mail.de>
> To: <elecraft at mailman.qth.net>
> Sent: Thursday, January 31, 2008 8:39 AM
> Subject: Re: [Elecraft] K3/100 RF Feedback/Spurious oscillations ?
>
>
>>> about it or not, but would be interested in solving this problem,
>>> as it impacted my ability to use our beverages on RX.
>>
>> At the Bavarian Contest Club's contest QTH we use a simple relay to
>> disconnect the rigs reception antennas whenever the rig goes to a TX
>> state. A simple relay, a few simple parts and the PTT/KEY signal do the 
>> trick.
>>
>> Many rigs do not switch the RX antenna input when transmitting, so this 
>> always requires a bit of care - especially at high power levels.
>>
>> vy 73 de toby
>>
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>
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