[Elecraft] Re: Question re K3 diversity reception

[N2TK]

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? 

73,
N2TK, Tony

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of wayne burdick
Sent: Tuesday, December 16, 2008 1:58 PM
To: Dr. James C. Garland
Cc: elecraft at mailman.qth.net
Subject: [Elecraft] Re: Question re K3 diversity reception

Dr. James C. Garland wrote:

> In using my K3 for diversity reception, I use my G5RV antenna on the 
> AUX subreceiver input, and my SteppIR for the main 
> (transmitting/receiving) antenna.  When I’m transmitting, does the K3 
> short the input to the subreceiver AUX input, or otherwise protect the 
> input from damage?  I’m using an amplifier, and the G5RV probably has 
> many volts of RF induced on it when I’m transmitting, and I don’t want 
> to damage anything.  Sorry if this has been covered before or, worse, 
> if the answer is in the manual.

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

---

http://www.elecraft.com

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