[Elecraft] KRX3 antenna input

[jeff kb2m]

Thanks for bringing up the attenuation issue with using ant1/ant2. Has 
anyone tried it both ways and have any comments?

73 Jeff kb2m

----- Original Message ----- 
From: "Ron D'Eau Claire" <ron at cobi.biz>
To: "'jeff kb2m'" <kb2m at comcast.net>; <elecraft at mailman.qth.net>
Sent: Tuesday, April 07, 2009 7:41 PM
Subject: RE: [Elecraft] KRX3 antenna input


> 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