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Author Topic: Heathkit VFO- VF-1 help  (Read 3653 times)
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Burt
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« on: July 26, 2013, 07:32:00 AM »
The VFO works fine in 160,80,40 band switch but on 40,20,15,10 the trimmer does not move the frequency hardly at all and the variable coil is full in and the frequency is about 800 KHZ high on 40 meters?
help?

* vf-1 schematic.JPG (64.37 KB, 954x712 - viewed 527 times.)
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N0WVA
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« Reply #1 on: July 26, 2013, 10:04:22 AM »
Possibly the permeability of the core has lessened over time. I had a National receiver that had this issue, only way I could fix it was rewind the coils with more turns.
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K3ZS
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« Reply #2 on: July 26, 2013, 03:03:45 PM »
I had a problem with the 40-10M trimmer being bad.   I rewired the 11M trimmer to be the 40-10M trimmer and realigned it to fix the problem.
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W1RKW
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« Reply #3 on: July 26, 2013, 06:55:03 PM »
The trimmer caps in the VF-1 go bad. Sometimes a very sparingly squirt of contact cleaner can make them work.
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Bob
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Burt
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« Reply #4 on: July 27, 2013, 10:42:13 AM »
I replaced the trimmer, problem solved!
Thanks.
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W2PFY
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« Reply #5 on: July 27, 2013, 02:08:04 PM »
Congratulations on your life time pass Grin Grin Grin
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The secrecy of my job prevents me from knowing what I am doing.
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