[R-390] R-390A PTO sync

[flowertime01 at wmconnect.com]

Bob,

If you have a counter you can count either of the PTO's in your receiver.

Count the BFO PTO off a tube socket pin through a capacitor.

To count the VFO PTO remove the adapter from the back panel so you can 
couple the VFO output cable to the counter BNC cable. Do a bit of math to decide 
what the VFO output needs to be compared to the dial readout.

Watch out that you do not run the VFO hard against an internal end because 
the VFO is way out of alignment with the KC dial read out.

Set the KC dial to the center of the zero adjust.
Read the VFO where it sets.
Do some math (the VFO is upside down) Where +000 is 2.455 and -000 is 3.455.
Think about where the KC dial needs to be.
Loosen the oldham coupler, hold the VFO shaft, dial the KC as needed.


You can set the VFO with the calibration osc, BFO set to zero and the KC 
dial at any 100 KHz. It will get you close. Be care full not to jam the VLF 
against its end points and you can get the alignment close enough to use the 
receiver.

It may take a time or two to get on the right 100Khz and get WWV at 5, 10 
or 20 Mhz.

But the process works well.

Roger Ruszkowski AI4NI</HTML>