Peering at the top of the schematic to see a fuzzy "JBC-312" and doing a little internet sleuthing turns up
https://blog.goo.ne.jp/vrc-tezuka/e/24c2fc39074361c0bd17b70bb9dd13ba
Receiver (JBC-312) Reception method: Superheterodyne Frequency range: 1.5-18Mc DC generator (JBD-77-B) (2 units borrowed from the Defense Agency)

I know nothing beyond that.
Nick England K4NYW
www.navy-radio.com


On Tue, Aug 22, 2023 at 8:44 AM Ray Fantini <RAFANTINI@salisbury.edu> wrote: