Johnson digest, Vol 4 #87 - [Johnson] Ranger VFO

[W1GOR]

Hello Mike,

I have several Rangers and their VFO's have been modified to move all
heat-generating components out of the VFO box.  I'll look through my files
for any Ranger upgrades and e-mail them directly to you.

73, Larry



> Message: 1
> From: "MIke Wells" <mwells@gcea.coop>
> To: "Johnson Reflector" <Johnson@mailman.qth.net>
> Date: Wed, 4 Jun 2003 10:34:21 -0600
> Subject: [Johnson] Ranger VFO
>
> Hello Gang,
>
> I wonder if anyone can tell me why the spot signal on my Johnson Ranger I
is
> different than the actual transmit frequency. The spot is approx 1.25 KC
> lower in frequency.
>
> Also, I have been working on a rapid drifting problem with the vfo. I
found
> the 160 vfo coil had been padded with a 30 mmf cap that was bad and it was
> causing most of the drift. I also found the 18K resistor had been replaced
> with a 15k so I would assume the OA2 was drawing allot of excess current
and
> contributing to extra heat. I replaced this resistor under the chassis
with
> a 25k 5 watt wire wound. I know this is well above the 18K that it called
> for but with higher line voltages today will this cause any problems in
the
> vfo stability? The OA2 is igniting and measures the 150 volts so I guess
it
> is seeing voltage that is high enough. Any comments?
>
> Mike W0FD