[Elecraft] KRX3 antenna input

[Ron D'Eau Claire]

There are couple of points to keep in mind if you don't use the AUX input
and use ANT1/ANT2 for both sub receiver and main tx/rx. They're covered in
the KRX3 manual, but in case you missed them:

1) You'll need well-isolated antennas to avoid RF tripping the COR in the
antenna input used by the sub receiver. 

2) If you try to listen on a higher-frequency band on the subreceiver than
you're using for the main, you may notice significant signal attenuation in
the sub receiver. That's because when using ANT1/ANT2 you're sharing the
main band pass filters and they have significant attenuation on the bands
above the one selected. 

Both issues are avoided by using the AUX input instead. 

Ron AC7AC


-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of jeff kb2m
Sent: Tuesday, April 07, 2009 3:44 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KRX3 antenna input

 I spent the morning installing a sub rx in my K3 #1516. All is working 
well. I set it up using the KAT3 ant2  as input the the sub rx. Now I'm 
thinking that there is no advantage to doing it this way(other then me being

too lazy to install the aux bnc connector). Does it really matter, is there 
any advantage to using the bnc as an rx only input?  I have a four way 
antenna switch downstream from the K3 so there is no advantage to the ant2 
not being used by the main receiver as all antennas come in through ant1. 
The ant2 input would go unused otherwise. Is the bnc rx input better, is it 
worth taking my K3 apart to install the BNC rx connector ? All 150 to 400 
answers  welcome...

73 Jeff kb2m
 

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