[Milsurplus] GRC109/R-1004A arrived!

[B Smith]

I just install a change over relay  for the 
antenna inside the transmitter and key it with the 
CW line.
Thus you have no loss and  "break in" cw.

breck k4che


--------------------------------------------------
From: "Mike Morrow" <kk5f at earthlink.net>
Sent: Tuesday, September 13, 2011 2:32 PM
To: <bcarling at cfl.rr.com>
Cc: <milsurplus at mailman.qth.net>
Subject: Re: [Milsurplus] GRC109/R-1004A arrived!

>How do you do the antenna T/R changeover?

An on-line manual for the AN/GRC-109 is at:

  http://bama.edebris.com/manuals/military/grc109/

If you're using the associated T-784A/GRC-109, you 
theoretically
can connect the receiver's antenna and ground 
terminals to the
associated terminals on the right side of the 
T-784A panel.  But...

If you look at the schematic for the T-784 in the 
manual above,
you'll see that the receive antenna path through 
the T-784 has a
lot of loss.  Most people just use use a separate 
antenna for the
R-1004 (even it it's just a random wire) rather 
than try to use
the same antenna to which the T-784 is connected.

I've never really warmed up to the AN/GRC-109.  I 
bought a complete
set at Dayton 15 years ago when they were still 
cheap, but I find
that the old AN/GRC-9 is much more attractive.

The interesting thing about the AN/GRC-109A models 
is that they
were made on a 1969 contract by Oklahoma 
Aerotronics for US Army
use in Vietnam.  The nomenclature plate for the 
R-1004A/GRC-109
incorrectly spells "RECEIVER" as "RECIEVER". 
American public
education rears its ugly head!

Mike / KK5F
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