[GreenKeys] Old Army Portable Communication Truck

[WA5CAB at cs.com]

Roy,

The radio set in the film is AN/GRC-46.  Late in the film, one brief 
section shows AN/VRC-29, which is basically the same set without the shelter.  The 
radio set utilized is AN/GRC-19, which operates AM, CW and FSK.  It does 
not do either SSB or ISB.  The statement in the film about simultaneous Voice 
and FSK output shows the transmitter being simultaneously amplitude 
modulated and frequency shift keyed.  They don't show the two traffic streams being 
received.  It would work with an IF type receiving converter but not with an 
audio one.  Or at least not very well.  Imagine trying to receive an AM (or 
for that matter an SSB) voice transmission while the same transmitter or a 
different one was transmitting FSK on the same channel.  :-)


In a message dated 02/05/2012 16:34:22 PM Central Standard Time, 
k1lky at earthlink.net writes: 
> On Feb 5, 2012, at 1:32 PM, steveripper at comcast.net wrote:
> 
> >Norm:
> >
> >I believe this is what you are looking for.
> >
> >http://www.archive.org/details/gov.dod.dimoc.28384
> 
> Greenkeyers,
> 
> I watched that movie.. learned a bit, not having every used any of the  
> gear shown.
> 
> 
> AN/GRC-36
> The movie says that simultaneous voice and RTTY signals can be carried  
> by one RF signal, but it does not say if it is independent sideband  
> operation, or if the FSK and voice (AM) are put on the same carrier.   
> Anyone know?
> 
> The movie shows the operator running the CW key left handed!
> 
> Roy
> 
> Roy Morgan
> k1lky at earthlink.net
> K1LKY Since 1958 - Keep 'em Glowing!
> 

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