I found the following at a web site that had one for sale.  Not much help, but it verifies it is an aircraft VHF receiver.
MILITARY AIRCRAFT DUAL VHF RECEIVERI believe this came out of a F-15 that was being upgraded


image.png

On Tue, Sep 13, 2022 at 3:40 PM Glenn Little WB4UIV <glennmaillist@bellsouth.net> wrote:
Does anyone have any info on a Raytheon VHF receiver part number R537852-2.
This is possibly airborne and possibly U2 related.

Thanks
73
Glenn
WB4UIV
-- 
-----------------------------------------------------------------------
Glenn Little                ARRL Technical Specialist   QCWA  LM 28417
Amateur Callsign:  WB4UIV            wb4uiv@arrl.net    AMSAT LM 2178
QTH:  Goose Creek, SC USA (EM92xx)  USSVI, FRA, NRA-LM    ARRL TAPR
"It is not the class of license that the Amateur holds but the class
of the Amateur that holds the license"
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