[Milsurplus] ID'ing a unit

[Mike Hanz]

I don't write 'em, I jes report 'em...  :-)

Good question.  One answer might be that this is for use at a location 
presumably with 60Hz power (like a command post with a generator), to 
key a TBW at a remote location to avoid DF or for the TBW operator to 
accommodate more than one remote location.  No indication of how the 
keying is accomplished.  The note below is the extent of the writeup in 
the NAVSHIPS.  Sez nothing about RTTY.

holden wrote:

>Why would they use a 115V 60 cycle unit with a TBW transmitter which takes
>115V 800 cycles? Also the TBW has it's own (very large) keying relay, not
>conducive to high speeds. And, the keying speed of 50 WPM doesnt jibe with
>RTTY speeds, not to mention that the TBW would make a lousy RTTY
>transmitter. How would you shift the RF freq?
>
>Howie WB2AWQ
>
>Mike Hanz wrote:
>
>>Probably a dupe, but NAVSHIPS 900,109 of Sept 1945 sez:
>>
>>"For use with TBW*.  Provides for starting and keying transmitter unit
>>over a single pair, or one wire and ground.  Transmitter starts when key
>>is momentarily closed and remains on for a delayed time interval after
>>last key impulse is transmitted.  6/2/44"
>>
>>There is an edit to this:
>>
>>"Key line resistance 35 DC ohms max; operates from 115/1/60.  9 watts
>>standby, 18 watts operating, keying speed 50 words/minute.  For general
>>radio use."
>>