[R-390] How does CU-168/FRR compare to the CU-872/U

[Nick England]

IIRC, the CU-872/U has very closely controlled transmission delays through
each path. This was necessary for summing multiple antennas for beamforming
in DF arrays such as the Wullenwebers.
FWIW, here's a typical signal distribution using CU-168 multicouplers
http://www.navy-radio.com/commsta/rcv-site-01.JPG

Does anyone know what happened to Jan Skirrow's site? He had a nice "Tech
Talk" on the CU-168.

I am using a CU-168 with an original tag that says "Multicoupler No. 25" -
fun to imagine there are 24 more in my back room serving the other 120
receivers.......

Also FWIW to the discussion, the shipboard receiver multicouplers dealt
with the big problem of close proximity between receiving and transmitting
antennas and included protection circuitry.
http://www.navy-radio.com/rcvr-coupler.htm
The most common post-war shipboard receive multicouplers, AN/SRA-9 and
AN/SRA-12, were just passive bandpass filters. Later active units like
SRA-49 had tunable front ends with quick overload shunting.
http://www.navy-radio.com/rcvr-nrl.htm

Nick England K4NYW
www.navy-radio.com


On Thu, Feb 21, 2019 at 11:41 AM Doug Hensley <w5jv at hotmail.com> wrote:

> How does the CU-168/FRR compare to the CU-872/U outside the former having
> 4 outputs and the latter has 8 ?  Favorably, unfavorably?  Not-comparable ?
>
> I've used the CU-168 (in fact I have two) but never the other.
>
> Thanks,
>
> Doug W5JV
>
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