[MRCA] GRA-39 on CW?

[Ray Fantini]

The GRC-106 is basically a SSB transceiver, CW is generated with the 1A5 chunk generating a 2 KHz tone that’s feed to the audio chain. The ALC has real control of the output power and would speculate that the power would be more or less equal to the peak power in SSB voice mode operation. I got 80 or so watts on 3.885 and around 115 watts on 7.275 on a Bird thru line into a 50 Ohm load with the engine running, but I have my ALC and biases set for what I thought would be good tube life in the amplifier. Also this is CW power and not peak envelope!
  You can put the radio in VOX and just key an oscillator into the microphone input and do the same thing. The big difference is that the 2 KHz tone in the 1A5 is derived from the main time base in the radio so it would be phase stable and maybe less likely to produce intermod products but doubt your worried about that anyway.
Trivia! The GRC-106 is not AM but just inserts a carrier to the USB operation, so its AM is USB with carrier. Sounds strange but you can find lots of alleged AM broadcasters like CHU doing the exact same thing.

Ray F/KA3EKH

________________________________________
From: MRCA <mrca-bounces at mailman.qth.net> on behalf of B. Smith <smithab11 at comcast.net>
Sent: Sunday, September 4, 2016 4:13 PM
To: mrca at mailman.qth.net
Subject: [MRCA] GRA-39 on CW?

     Since the GRA-39 uses "tone" over the twisted pair  for transmit
and receive keying signaling and the tone seems to be fairly fast in
developing on the line when  the 2228 PTT is closed   it seems that the
tone system would lend its self to  used on CW on the GRC-106 by
putting the set in "CW" mode and keying pin F . Perhaps with the  faster
tone keying it would be better on CW than the  GRA-6  remote system
which uses  relays.

Q.  What is the GRC-106 maximum power on CW and has anyone actually
measured it?

Z


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