[ARC5] WWII Aircraft Set- Primer?

[George Babits]

there was a GO-6 too.  I have one.

George
W7HDL


----- Original Message ----- 
From: "Mike Morrow" <kk5f at earthlink.net>
To: <arc5 at mailman.qth.net>
Sent: Monday, May 07, 2018 6:15 PM
Subject: Re: [ARC5] WWII Aircraft Set- Primer?


>> ...the aircraft version on the TBW was the GO-9...
>
> And the principal electrical distinction was the TBW's 843 PA grid 
> modulator stage. which allowed A3 emission.  The GO-9 is A1 and A2 
> only...with A2 generated from the 800 Hz primary AC power.
>
>> Question, somehow I have only ever seen GO-9, was there a GO-8 or 7?
>
> There were 11 different GO-series liaison transmitter systems between 1933 
> and 1944. All were A1 and A2 emission.  The intermediate frequency 
> transmitter for all covered 300 to 600 kHz MF.  The HF transmitter 
> frequency coverage in kHz varied:
>
> GO      1933     Hygrade-Sylvania     4000-13575
> GO-1    1934     Western Electric     3000-13575
> GO-2    1935     Western Electric     3000-13575
> GO-3    1937     Westinghouse         3000-13575
> GO-4    1938     General Electric     3000-26500
> GO-5    1939     General Electric     No HF unit
> GO-6    1939     General Electric     3000-26500 (No IF unit)
> GO-7    1940     Westinghouse         3000-13575
> GO-8    1940     Westinghouse         3000-13575
> GO-9    1940     Westinghouse         3000-18100
> GO-9a   1944     Westinghouse         2200-18100
>
> The scant surviving technical information indicate that there were major 
> design differences from one manufacturer to another.  Most except the GO-9 
> were likely made in quantities well under 100, so very little equipment or 
> tech info has survived for most GO sets..
>
> List member George has what is probably the only surviving 1939 GO-6 HF 
> transmitter, and the Pensacola Naval Aviation Museum has a cutaway PBY on 
> display that appears to have a 1935 GO-2.  Everything else that has 
> survived seems to be a GO-9 unit.
>
>> Also the TBW and the GO-9 were so close but yet not the same,
>> how did that happen?
>
> Patrol plane communication service requirements differ greatly from those 
> of "portable" ground communications service.  What is remarkable is that 
> the GO-9 and TBW transmitter units are so similar, not that they differ in 
> small details.
>
>> What came first?
>
> The first GO was made in 1933, and the first Westinghouse GO-3 in 
> 1937...years before the Westinhouse TBW.
>
> Some other GO-related notes:  I believe the amazing upper limit of 26500 
> kHz for the 1938 GE GO-4 is what motivated A.R.C. to develop the RAT and 
> RAT-1 (13500 to 27000 kHz) sets to extend liaison receiver coverage beyond 
> the 13575 kHz limit of the RU-11 and RU-12 liaison receivers.  Further, it 
> seems that A.R.C. designed the eight-receiver RAV 190 to 27000 kHz set to 
> replace the RU-12/RAT-1 with modern superheterodyne receivers.  However, 
> the A.R.C. RAV was definitely the inferior set in most qualities to GE's 
> RAX-1 three-receiver liaison system.  The RAX-1 had much better staging in 
> its two receivers that provided most of its 200 to 27000 kHz coverage. 
> Only 46 RAV liaison receiver sets were made, while the RAX-1 was made in 
> the thousands.
>
> A.R.C. made up for it with five receivers identical to or very slightly 
> simplified from the RAV system becoming standard "command" set radios 
> purchased by the tens of thousands.
>
> Mike / KK5F
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