John is correct. Diversity receivers require a common LO. This is
provided in the K3 with the aux receiver, but adding VHF transverters
to both receivers will not add properly if they are running separate LO's.
I am in the process of setting up a 2m dual-polarity receiver using
two transverters but run with one LO driving both units. I
discovered that DEMI is developing a dual-Rx transverter (two Rx
antenna ports and IF outputs) that implements this in a single unit -
I'm on the short-list to get one when available).
Just connecting two separate 2m transverters will not ensure proper
phase relationship between the two IF outputs so one could end up
with a situation where the two signals null each other. This is
analogous to combining two transmit amplifiers. If the outputs are
out of phase energy from one will to into the other with disastrous effect.
73, Ed - KL7UW
------------------------------
Message: 31
Date: Mon, 13 Sep 2010 08:38:06 +0100
From: "John Lemay" <
[hidden email]>
Subject: Re: [Elecraft] two 2m-Transverters for diversity reception on
2m
To: "'DF1AL'" <
[hidden email]>, <
[hidden email]>
Message-ID: <197109066C874AF98C6FE5C70D844C28@G4ZTR>
Content-Type: text/plain; charset="us-ascii"
Joe
I'm not sure if you will get true diversity reception unless the
transverters are identical and have frequency locked oscillators.
I stand corrected if there are experts on this forum !
Regards
John G4ZTR
73, Ed - KL7UW, WD2XSH/45
======================================
BP40IQ 500 KHz - 10-GHz www.kl7uw.com
EME: 144-QRT*, 432-100w, 1296-QRT*, 3400-fall 2010
DUBUS Magazine USA Rep
[hidden email]
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