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Author Topic: Anyone hooked a Model 122 VFO to a Johnson Challenger  (Read 1363 times)
KG0MN
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« on: October 25, 2014, 01:16:32 PM »

What has me confused is the fact the VFO has one cable octagonal plug and a another with a PL-259 and I am wondering if the PL-259 is the VFO output or does it go to the transmitter through the octagonal plug?

Thanks
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W8AAZ
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Posts: 359




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« Reply #1 on: October 25, 2014, 06:23:17 PM »

The 122 takes it's power from the radio with the octal connector cable.  The VFO RF output is thru a coaxial cable, in your case, with a coax connector.  On the Adventurer, it is connected to one of the crystal sockets on the front of the transmitter, one marked "crystal" and one marked "VFO".  You will have to read the instructions for your Viking to see how they want the VFO connected to drive the radio.  But in my case, the coax has to be terminated in a two pin connector that functions like a FT 243 crystal connection. 
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WA2CWA
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« Reply #2 on: October 28, 2014, 10:50:37 AM »

Read the manual for the Model 122 VFO. The VFO output cable length is somewhat critical and it's not uncommon that you might have to add some termination components inside the transmitter when connecting the VFO.

Pete, wa2cwa
www.manualman.com
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N8CMQ
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« Reply #3 on: October 29, 2014, 04:52:33 PM »

I had many hours experience with the 122 hooked to a Viking II.
When I tried keying the VFO, I would get chirp. If I keyed the
transmitter with the VFO free-running, no chirp, but a steady
tone in the receiver. The steady tone was very low, and it
made it easy to spot tune the VFO. I turned off the VFO when
I was receiving with the send/receive switch.
Definitely not break-in keying.
IF, you have problems, there are alternative ways of using the 122.
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