[ARC5] SCR-274 VHF BC950

[robinson at tuberadio.com]

Hi Peter,

there is a copy of the ATA/ARA manual here....
http://www.tuberadio.com/robinson/Manuals/

Regards
Ray

> Hello ,
> I have an original BC950 VHF Transmitter as part of my SCR-274 System.
> Sorry but a matching VHF receiver BC-942 was not available, I had to use
> a R28/ARC-5 instead.
> The difference between the T-23 and the BC-950 is the way both
> transmitters are modulated. The BC-456 Modulator of the SCR-274 system
> was used to modulate the screen grid
>   and did not have enough power to plate modulate the 832 tubes used in
> the BC-950. The solution was to add a Modulation stage inside the BC-950
> with a 815 dual tetrode to up the modulation.
> Otherwise both transmitters are identical in design electrically.
> I made a schematic of the modulation circuit in the BC-950 and try to
> attach it.
> I demonstrated this system at several Ham Club meetings in Colorado with
> very good results. I included the different Nav system used by the
> Luftwaffe, Royal Air-force and the American Army Air-corps
> in the Pacific Theater,the AN/ARR-1 and R-4/ARR-2 are part of my system.
> I owe a completer Manual on the ATA/ARA system and will try to scan it
> in and upload to the Bama site. It will take some time.
>
> Regards
> Peter
> KC0DGM
>
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