This is an RCA Yachtsman AC/DC portable radio, model 7BX9H. I could only date this one some time in the 50's.
This is an interesting radio because of the Marine,
Aircraft and Ham bands. You will notice the rotatable antenna on the
top. That was used for Radio Direction Finding while out at sea in a
boat. If you knew the approximate location of a radio transmitter then
you could rotate this antenna for either a max signal, or for a null in
the signal, and by doing that you could determine the compass heading
to that location. If you did this for two different stations, then
plotted the heading on a nautical chart, you could determine your
POSITION as the point where the two plotted lines intersect. It wasn't
high accuracy navigation, but it was better than nothing.
This radio was a donation from Keith, WE6R, and
Elise, K1ZAP. Thanks you two. You gotta love that ZAP call sign. BTW,
Keith has a nice website at http://www.we6r.com
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