viking2/122 vfo problem

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ve6pg:
HI FROM TIM..VE6PG/3...MY 122 VFO HAS A NOTICABLE CARRIER ON THE "PHONE" POSITION OF MY VIKING2. WHEN I PUT THE VIKING IN THE CW MODE ,I HAVE A NICE ZERO BEAT SIG ON MY NC300. WHEN I TURN TO THE PHONE POSITION, I CAN STILL HEAR THE CARRIER. IF I CHANGE THE BAND SWITCH ON THE VFO TO ANOTHER BAND,AND THEN BACK TO WHERE I WANT TO OPERATE,THE CARRIER IS GONE...BUT! WHEN I AM FINISHED TRANSMITTING(IS PHONE POSITION),THE CARRIER IS BACK,AND I HAVE TO CHANGE BANDS AGAIN ON THE VFO,AND BACK TO WHERE I WANT TO BE,AND THE CARRIER IS GONE...WHAT IS THE DEAL HERE!!!! ANYONE HAVE ANY IDEAS...PLEASE LET ME KNOW..
   73...TIM...ve6pg@rac.ca

W1DAN:
Hi Tim:

I noticed this with my Viking 2. The VFO signal was not that strong to interfere with my reception though. Possible shielding grounding improvements?

One far fetched idea would be to add a relay and/or switch to add some capacity to the tuning cap of the VFO to pull the frequency away from your receive frequency when in receive.

The VFO could probably be killed when in receive, but that would probably reduce stability.

Good luck,
Dan
W1DAN

WA1GFZ:
My 122 does the same thing and it doesn't hurt a bit after 25 years.

WD8BIL:
IIRC the 122 is grid blocked keyed !

Check for a leaky bypass or shaping capacitor either in the VFO or the keying line from the transmitter.

I don't have the schematic in front of me but I have 2 Viking/122 setups and hear no VFO signal in the phone mode on either setup.
After an AM transmission I have no signal present.

WA1HZK:
That VFO is Cathode Keyed. Look at the .005 cap across the key jack. It's probably leaky. There should be no current flowing in that tube when it's un-keyed. Thats our thinking as of tonights conversation.
Keith
WA1HZK

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