[Milsurplus] Looking for a Navy ATD 9050-15,800 Tuning Unit

[Rob Lee]

Interesting dialog on the ATD. Wondering if the same holds true for the 200-540 tuning unit? I see in the preliminary ATD instruction book I have (s/n 4955 dated 20 May 1940) the frequency coverage on the manual front cover has been blacked out. It looks as if it may have been done by the printer. It has faded to the point where the original print can be seen (200-15,800 kc). I also noticed in figure 1 (the first fold out page) the unit pictured shows the same compliment of tuning units as I have (540-1500, 1500-3000, 3000-9050, 3000-9050). Does anyone know if the s/n listed on the front cover of the instruction book originally matched the serial number of the ATD?

Rob
  ----- Original Message ----- 
  From: Hubert Miller 
  To: Military Surplus Mail List 
  Sent: Tuesday, April 25, 2017 1:10 AM
  Subject: Re: [Milsurplus] Looking for a Navy ATD 9050-15,800 Tuning Unit


  ATD could not have met the Navy specs to replace GO series. The ATD proposed top frequency was 15 MHz, not meeting the apparent long distance patrol spec of 18 MHz.

  By inspection, i would not think the ATD would deliver respectable stability on any frequency around even 15 MHz.

  -H 

  >The ATD was apparently a competitor to the Collins ATC to replace the GO's and GP's.  Neither it nor the ATC would have been installed in a multi-engined aircraft along with either of those older sets.  Plus four of the GO's went up to 13575 KC and three went to 26500.  Only the final three stopped at 9050.  The RAT and RAV were reportedly built to go with the first seven models, either in addition to a Liaison RU or standalone.

  Robert Downs - Houston
  wa5cab dot com (Web Store)
  MVPA 9480

  In a message dated 04/25/2017 01:42:10 AM Central Daylight Time, Kargo_cult at msn.com writes: 




    I wager no one outside the manufacturer's labs saw the high tuning unit. 
    Consider this also. The matching receiver would have to be the RAX. That means a large PB class plane, where the transmit job was already being
    handled by the GO transmitter. There was no Navy use for the ATD high tuning unit. TB class planes only had a receiver going to 9050, even when 
    fitted with a transmitter going to 18 MHz. 
    -Hue 

   



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