[Elecraft] 2nd RX

[Edward R. Cole]

a Fifth reason is only a WISH, at this time:

Duplex receive on another band (e.g. receive 435-MHz downlink of a 
satellite while transmitting 145-MHz on the uplink).

I am wondering if it might be possible to do by extracting the sub-Rx 
IF to a HF receiver (or P3 or other SDR with IQ to a computer running 
sw that can perform the demod).  I suspect the 15-KHz SDR inside the 
K3 shares ckts between Tx and Rx preventing full-duplex.  But if the 
sub-Rx 1st conversion could function using the Rx antenna while the 
main radio is in Tx using Ant1 (or 2), this could be done (I think).

Two transverters would be used: one to receive and the other to transmit.

73, Ed - KL7UW

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Message: 12
Date: Fri, 4 Mar 2011 10:16:22 -0800
From: Wayne Burdick <n6kr at elecraft.com>
Subject: Re: [Elecraft] 2nd RX
To: Lee Buller <k0wa at swbell.net>
Cc: Elecraft Reflector <elecraft at mailman.qth.net>
Message-ID: <CC87F3A4-18DF-40DE-85F2-286C9FD64368 at elecraft.com>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes

Actually there's a fourth reason. If you use QRQ CW mode (ultra-fast
break-in), you can't normally use split or RIT. But if you have the
sub receiver installed, you can transmit on VFO A and receive on VFO
B, which will achieve the same goal in many situations.

73,
Wayne
N6KR


On Mar 4, 2011, at 10:10 AM, Wayne Burdick wrote:

 > Hi Lee,
 >
 > There are three reasons you might want the sub-RX: (1) diversity; (2)
 > listening to both your RX and TX frequencies when operating split; (3)
 > monitoring one band while you operate on the other.
 >
 > The K3's sub RX has identical performance to the main RX, so it excels
 > at all of these applications.
 >
 > 73,
 > Wayne
 > N6KR



73, Ed - KL7UW, WD2XSH/45
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