[R-390] Space diversity reception

[Doug Hensley]

I have a complete AN/URA-6 group available which does diversity well and uses the R390A's true IF output.  Comes with a full original manual.

Pick-up only in Central Louisiana.  I have it listed on eBay and pictured on my QRZ page towards the bottom.


Doug W5JV





Visit https://www.qrz.com/db/W5JV for some great vacuum tube finds.



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Sent: Sunday, February 16, 2025 11:00 AM
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Subject: R-390 Digest, Vol 247, Issue 5

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Today's Topics:

   1. Space diversity reception (Byron Tatum)
   2. Re: Space diversity reception (Nick England)


----------------------------------------------------------------------

Message: 1
Date: Sat, 15 Feb 2025 17:40:02 +0000 (UTC)
From: Byron Tatum <bjtatum1 at att.net>
To: R-390 Mailing List <r-390 at mailman.qth.net>
Subject: [R-390] Space diversity reception

Hello-? ?I have been searching for some additional info regarding space diversity reception using a pair of R-390A's. Does anyone know of someone who has experimented with this and has some information?Thanks,Byron W5FH

------------------------------

Message: 2
Date: Sat, 15 Feb 2025 12:55:37 -0500
From: Nick England <navy.radio at gmail.com>
To: Byron Tatum <bjtatum1 at att.net>,      Collins R-390 HF Receiver List
        <r-390 at mailman.qth.net>
Subject: Re: [R-390] Space diversity reception

Not specifically R-390A, but several guys on our 40m RTTY net have
experimented and found space diversity really helps a lot.
Not sure what your application is, but continuous signal RTTY is a good
test case.

A standard military setup for RTTY was dual-diversity R-390A receivers with
the FSK converter selecting the strongest signal.

The Navy AN/FRR-49 used the AN/URA-8 AFSK converter (two converters plus a
comparator)
http://www.navy-radio.com/commsta/r390-cv89-01.jpg

The Army AN/FRR-38 used two R-390 plus a CV-116 converter/comparator
http://www.navy-radio.com/rcvrs/images/frr38-03.JPG
http://www.navy-radio.com/rcvrs/images/frr38-02.JPG
http://www.navy-radio.com/rcvrs/images/frr38-01.JPG

Some more diversity receivers at
http://www.navy-radio.com/rcvr-div.htm

Nick England K4NYW
www.navy-radio.com<http://www.navy-radio.com>


On Sat, Feb 15, 2025 at 12:40?PM Byron Tatum <bjtatum1 at att.net> wrote:

> Hello-   I have been searching for some additional info regarding space
> diversity reception using a pair of R-390A's. Does anyone know of someone
> who has experimented with this and has some information?Thanks,Byron W5FH
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