Gang,

Terryo.org has a file with a component interconnect diagram, and schematics of the individual modules:
https://blackradios.terryo.org/documents/manufacturers/Sylvania/Sylvania-R-1451-schematics-block-diagram.pdf

Thanks to the group for helping me find this.  R-1451 is an interesting communications receiver from about 1965.



Part of AN/WLR-6 "Waterboy" intercept system for submarines.

It's a straight forward solid-state superhet, but double conversion on the upper bands.  They managed to enable the counter to monitor the local oscillator, and calculate the frequency.  Crystal filters in the I.F., and one can frequency-lock to the counter.

Enjoy,
AL

On 7/8/2025 4:28 PM, Anthony Clare wrote:
Don't I wish. I have a 1451 too. I got a little info from Nick, K4NYW a while back. Lemme see if I can find it. It's not much but I will send it your way.


------ Original Message ------
Received: Tue, 08 Jul 2025 12:06:50 PM EDT
From: Al Klase <[email protected]>
To: Military Radio Collectors Association <[email protected]>
Subject: [MRCA] R-1451/WLR-6 Manual


Anybody have one?

--
ARK Sig Block Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/

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--
ARK Sig Block Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/