[Milsurplus] LF Aircraft radio

[Hue Miller]

Dave Stinson recently listed LF frequency assignments pre-war.
I was today looking at the Navy model MB aircraft radio manual.
This tunes 540 - 995 kc/s. Transmitter is 1 x 2 CG-2566. Receiver
uses 5 CW-1344 in a regen circuit. B+ input seems to be 450V
at around 300 mA for transmit. Manual actually says tubes are
run over spec to meet the needed power. Antenna said to be
around 250 ft trailing wire. Transmit freq is divided into 24x
20 kc/s bands; transmitter is VFO excited; "band change" in
flight accomplished by opening cabinet fasteners, pulling 
chassis out 4 inches, and moving a switch. I did not see a  
date anywhere in the manual. However I have seen a later
radio, which looks the same, but tunes 3000 - 4000 kc/s,
with single channel quartz controlled transmitter; this is
the model ME-1 dated 1929.  I "believe" I saw somewhere
a reference to one of these sets used in "Corsair" biplane
aircraft. I assume this progression is one away from MF
into the HF frequencies. Perhaps too much QRM from
Talk Radio stations in the A.M. band.
( BTW, I saw one of those import transistor radios that
actually boosted the "band count" by dividing the AM
band into Talk and Sports segments - executed only
by dial markings indicating 2 bands - while actually
still tuning the AM band in one undivided swath. )
-Hue Miller