[Elecraft] Re: Question re K3 diversity reception

[w8zn at comcast.net]

As an add-on, we have used a pair of K3's at K8GP multi multi VHF station on 6m. Our 5 element and 7 element antennas were only several hundred feet apart and we didn't hear the COR come on and we could actually copy stations 20 KHz away from our transmitter running 1500w!!!

I'm sure this sends chills down Wayne's back but it works!!!

Terry
 -------------- Original message ----------------------
From: wayne burdick <n6kr at elecraft.com>
> 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
> 
> ---
> 
> http://www.elecraft.com
> 
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