[Milsurplus] Navy ATD transmitter

[mac]

Eugene,

Good article on the ATD by Walt Hutchcens, KJ4KV in Electric Radio  
#35, March 1992.

This is the radio that came in "second place" to the ATC (ART-13) when  
the Navy let a contract in 1940 for a new aircraft liaison  
transmitter.  Ultimate application of the 1939's plug-in tuning unit  
concept, i.e., four plugged in at a time with a manual and motor  
driven switching arrangement.   MOPA rig, 6L6 ECO driving an 814 PA.   
Plate modulated by a pair of 6L6s.  Good for about 40 watts carrier.   
Way behind the ATC in capability and technical sophistication but  
probably cost MUCH less to manufacture.

For some reason Bendix designers chose to use gobs of 2W carbon  
composition resistors in series and parallel arrangements in screen,  
cathode and other circuits instead of single wire wound units with  
appropriate dissipation ratings.  I found many of these components to  
be FAR out of tolerance in my ATC.

Interesting and unique rig and, though. Works reasonably well in ham   
service on 160, 75 & 40M.

Have fun.

Dennis D.  W7QHO
Glendale, CA

***************
On May 1, 2011, at 8:34 PM, W2HX wrote:

> Hello all,
>
>
>
> Picked up a honey of an ATD this weekend at nearfest. New, never  
> installed
> with dynamotor.  I will be in need of cables (or at least connectors)
> between the ATD and the dynamotor and the cable for power to the  
> dynamotor.
> Also if anyone has some of the other "goodies" accessories for it  
> please let
> me know.  Things like the T-38C mic, CRR-55079 Remote Indicator Unit  
> and
> CRR-23280 Remote Control unit  and associated interconnect cables.  
> (I have
> no idea what these do!).
>
>
>
> And lastly, other than the BC-342/348/312 type radios, were there  
> other
> receivers that I might consider pairing up with this transmitter?
>
>
>
> Thanks all
>
>
>
> 73 Eugene W2HX
>
>
>
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