[Milsurplus] GRC-109 in use

[B. Smith]

This is a common problem with the GRC-109. The tuned circuit on the GRC-109 
absorbs most of the signal so I used a 5  volt DC SPDT antenna relay which 
is keyed by the normal CW keying circuit and powered by the filament voltage 
picked up from   transmitter board TB2. The filament voltage was  rectified 
by a diode and capacitor. If you are not going to use the AC mains then you 
do not need to rectify the filament voltage. I used an isolation diode on 
the relay when I connected it to the keying circuit. The relay, diode, small 
cap  etc. are  easy to put in and easy to take out, no holes drilled etc. 
Also while you are inside  the transmitter check  diodes CR1 and CR2 on the 
receiver antenna port.        Pictures available.
I will try and post the information this month on my web page.

73 breck k4che


----- Original Message ----- 
From: <Military1944 at aol.com>
To: <milsurplus at mailman.qth.net>; <Wireless-Set-No19 at yahoogroups.com>
Sent: Saturday, February 09, 2008 8:58 AM
Subject: [Milsurplus] GRC-109 in use


|I have been trying this GRC-109. I do not think I am getting my signal
| through the coupling of the tx through to the rx ae socket. When I attach 
the ae
| direct to the rx there is a good signal strength but through the tx it 
drops
| quite a lot.
|
| I have just changed the 18pf coupling cap, no difference. I lifted off the 
2
| diodes, no difference.
|
| Anyone else noticed this problem or have any suggestions?
|
| cheers, Ben G4BXD
|
|
|
|
|


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