[Milsurplus] ( was Japanese Chair ) GO-9, TBW A3

[Hubert Miller]

RCAF somehow had a different philosophy. Their AR-6 + AT-12  pair, used in RCAF "Canso" PBYs, had a transmitter similar in some ways to the the GO-9, but.
There were 2 sections, LF and HF, and a power supply - modulator.  No one that I know of, knows what or even IF there was another command-type radio
onboard. Unfortunately, so far no photos online of the AT-12. Seems not many survived, of not many built, and it further appears NO LF sections or PS-modulators
survived. Writing has been around, what, 5000 years? and it seems only recently were thorough attempts started, to catalog all past technology. 

Not much documentation on USCG or RCAF equipment, seem little known about these areas.
-H 

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of Mike Morrow
Sent: Tuesday, February 14, 2017 2:50 PM
To: Military Surplus Mail List <milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] Japanese Chair

> The TDE and TBW are very similar in use of dual sections for HF and 
> MF, use of screen modulation and the use of a signal 813 PA tube.

I don't know about the TDE, but that 843 modulator in the TBW wouldn't make much of a screen grid modulator for an 813.  Westinghouse was fond of PA suppressor grid modulation instead.

I doubt that weight savings, if any, is what determined that the GO-7/8/9 series would not have the TBW's modulator.  It would have likely required less than two pounds to add the TBW's 843 suppressor modulator circuit to the GO-* rectifier-modulator.  Since a GO-series unit was a long-range transmitter locally operated by a skilled operator in large patrol aircraft, I suspect the USN decided deliberately without consideration of weight issues that the GO-* transmitters needed A1 and A2 modes only.  Skilled radio operators were always Morse proficient.  A3 mode was of minimum value except for the pilots' GF-*/RU-* set.

Mike / KK5F