[R-390] Diversity with an A and a non-A?

[Fred Moore]

Paul, 

I don't think you need to worry about any difference in propagation deleay
between the two receivers.  gain matching is important.  check schematics to
confirm that the diode connection is done the same way (almost certainly is
compatible).  Then it can be tried. 

-Fred

------ Original Message ------
Received: Wed, 24 Feb 2021 07:40:57 PM GMT
From: Paul Staupe <staupe at gmail.com>
To: fred_moore at usa.netCc: Collins R-390 HF Receiver List
<r-390 at mailman.qth.net>
Subject: [R-390] Diversity with an A and a non-A?

I read through the Pearls just now and didn't see any references to
diversity reception with a R-390A and a R-390.  I have one of each, so I'd
like to try it out.

Both receivers are capable of diversity reception and I imagine it's
possible to do.  I'm wondering if the phase delay in the mechanically
filtered A model would be significantly different enough than the L/C
filtering in the non-A to make a noticible difference in this configuration
vs. a set up with identical models?

Thanks,

Paul W0AD
Minneapolis
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