[Elecraft] Re: Question re K3 diversity reception

[Jerry Flanders]

Hi Wayne

At what approx. RF voltage level sent back into the rx from the 
second antenna do we need to worry about additional protection like 
external switching or shorting?

Also, what do I hear when the COR activates? What sound? Is this a reed relay?

I operate SO2R and occasionally need to measure to verify safe RF 
level into the second rig and would also like use my 2nd K3 
(synch-tuned) for diversity rx while tx'ing on 1st K3. An actual RF 
voltage level I can use as a measurable limit would be a very useful 
parameter.

Jerry W4UK

At 01:57 PM 12/16/2008, wayne burdick wrote:
>Dr. James C. Garland wrote:
>
>>...  When I'm transmitting, does the K3 short the input to the 
>>subreceiver AUX input, or otherwise protect the input from damage? .

>Hi Jim,
>
>The KRX3's AUX input is protected by a gas-discharge tube, bleeder 
>resistor, and carrier-operated relay. It is very unlikely to be 
>damaged. However, activation of the COR (which you would hear as you 
>key the rig, etc.) can be disruptive to T-R sequencing. If you hear 
>the COR relay go on, I'd strongly suggest that you either reduce the 
>coupling between the two antennas or provide external switching or 
>shorting (this could be done via the KEY OUT jack on the K3).
>
>73,
>Wayne
>N6KR