https://www.americanradiohistory.com...RC-1962-06.pdf
Look at page 819
I used to be asst QA manager at Burndept in the late 70’s, early 80’s when they were at St Fidelis Rd, Erith, by that time we didn’t make many BE301’s, just replacements. They operated on 121. 5?, international distress frequency, they were a pulsed beacon. Not to be operated outside of a faraday cage!
Tim M0AFJ