[Milsurplus] ID'ing a unit

[WA5CAB@cs.com]

Howie & Group,

I had to think a minute to recall how FSK got into a thread on the CNR-23442, 
which as Barry said is marked on its nameplate "For General Radio Use".  And 
then I remembered it was a tangent taken because of the Contractor, Northern 
Radio.  From equipment we've all seen (but almost all of it from the 50's and 
60's), they mostly made what we would probably today call electronic data 
related equipment (MODEMS's), for both radio and telephone systems.  So it follows 
that since one of the cosmetic companies (Helena Rubenstein?) made 
R-390A/URR's, that R-390A's must all smell good.  :-)

The keying speed referred to is manual morse.  I'm also puzzled by the 
reference to the TBW, although besides the gasoline powered 800 Hz generator there 
was also an M-G set with both 25 and 60 Hz motors.

In a message dated 2/14/2004 5:18:18 AM Central Standard Time, holden@nac.net 
writes: 
> 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."
> >

73
Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
<wa5cab@cs.com> (Primary email)
<wa5cab@houston.rr.com> (Backup email)


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