[Milsurplus] Aircraft Radio Corporation T-15, -16, -17

[Hubert Miller]

Canal Zone was U.S. property then, and I can't see any occasion to interoperate with Costa Rican Air Force.
Was there even a Rican Air Force at all?
Morocco was a colony of France. 
I know the aircraft frequencies extended into broadcast bands into the early 1930s at least. I have the manual
for the Navy MB which tuned 540-950 kHz. However this radio was followed soon by the ME, which tunes 
3-4 MHz, date 1929. 

If i have it right so far, this question applies only to military communications. ( Up to me to disprove / eliminate
civilian air communications from the discussion, which I will do. )   

The "overseas colonies" argument, I suggest is weak, as the colonies of Europe would be equipped with the same
equipment standard in the empire's military. 

This leaves Costa Rica - level nations' militaries, do I understand this right, so far?

You know, I recall now sometime way back I read about some radios manufactured for Colombian Air Force
in the late 1930s. I think absolutely no examples survive; but I believe some paper docs survive; perhaps at a 
later point I'll look into this. The descriptions I read so long ago called out no remarkable features such as 
long wave or medium wave coverage. Also I don't think at this time foreign countries were receiving hand-me-
down U.S. aircraft; as far as I can tell, even banana republics went right to the aircraft manufacturer for their
fleet, such as it was, or wasn't. ( Which maybe accounts for some obscure little-known variants which are 
entirely extinct ? ) 
That's what I think "so far".
-H 

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of David Stinson
Sent: Wednesday, July 12, 2017 12:56 PM
To: milsurplus at mailman.qth.net
Subject: Re: [Milsurplus] Aircraft Radio Corporation T-15, -16, -17


----- Original Message -----
From: "Hubert Miller" <Kargo_cult at msn.com>
> 
> I also think the airfield frequencies theory is imaginative but wrong. 
> Don't take it personally.

Well, I understand, but I didn't pull that theory "out-of-the-air" (pun intended).  I do have some basis for the idea.

Military Aircraft equipment, Standard 1920s- to early 30s, until SCR-183 came out:

SCR-133 Pursuit Plane Set, Rcvr 250-1750 KC, 
                Xmtr 860-2000 KC AM
SCR-134 Aircraft TX 400-850 KC, RX 250-1500 KC
SCR-135 Scout/Bomber Radio,  250-2000 KC

1926 Navy Comm Plan, Aircraft Freqs:
District aircraft: 1105-1295 KC
Air Squadrons and Aircraft Shore Stations: 550 KC Naval District Patrol Patrol Planes: 605, 685, 755 KC (Etc.  There is much more but I think this sufficient).

Mike Morrow:   You are the expert in this 
pre-war aircraft gear.  Comments?

If a U.S. Navy squadron is going to patrol the area around the Panama Canal and has been ordered by "pols and generals" to "good neighbor" 
co-operate with Costa Rican patrol aircraft, the Costa Rican's aren't likely to have "modern" equipment right away; they're going to have what they bought 10 or 15 years ago or "Uncle Sam's Hand-me-downs"
like SCR-135.  If a patrol of Hellcats wanted to talk to an unknown surface vessel, 500KC would likely be the only means short of dropping a note with a rock and hoping someone there reads English.

If a list member has any contacts with military historians in places like Costa Rica or Columbia (or Iran or Morraco etc.) that have knowledge of what indiginous military patrol aircraft carried for comms in 1940-44, it would be interesting to hear.  I've got a standing bet of coffee and donuts we'll find it was MF stuff fitting the conventions of late 20s above.

73 Dave S.





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