[Elecraft] Re: Question re K3 diversity reception

[wayne burdick]

Tony, N2TK wrote:

> Wayne,
> To carry this one step more, what about when I am running multiple 
> K3's on
> different bands at the same time? Do you recommend to use external 
> receive
> bandpass filters on the receive lines if I am using receive antennas 
> on  the
> Receive Antenna and/or Aux input?
> And also use transmit bandpass filters on the transmit antenna input 
> when I
> am using the transmit antenna for both receive and transmit?

Hi Tony,

Every multi-transmitter installation is different. In general, TX and 
RX antennas should be well-isolated.

If you hear the COR (carrier operated relay) on any K3 activate -- 
either the one on its RX ANT jack or the sub receiver's AUX input -- 
you should try to improve isolation. You'll know it when you hear it, 
because T-R normally involves only PIN diodes on a K3. There will be 
extreme cases where a band-pass filter or external shorting may be 
required, depending on the situation.

There are many multi-K3 installations, some permanent, some for 
DXpeditions. We've had many reports about the ability of the K3 to 
function well in such cases -- often much better than older rigs. I'm 
sure you can get further help in specific situations from some of those 
monitoring this list.

I'm not the right guy to ask, at least at present. My entire massive HF 
antenna farm is a 50' random wire, 20' up, fed with 300-ohm twin lead. 
I have to sign some sort of XYL-related legal papers or buy more 
acreage if I want to expand :)

73,
Wayne
N6KR

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