[Heathkit] VF-1 minor annoyance...
Jordan Arndt
[email protected]
Fri, 14 Jun 2002 14:14:46 -0600
P.S.... it could also be a poor corroded contact at the rear of the main
tuning capactor ... you might try some conductive lubricant... agn 73....
[email protected] wrote:
> My guess would be dirty contacts on the bandswitch.
>
> Mark WB8JKR
>
> On Fri, 14 Jun 2002 11:01:04 -0700 "Kenneth G. Gordon" <[email protected]>
> writes:
> > I have an excellent VF-1 (the later model with the steel chassis,
> > ceramic
> > sockets, and ceramic bandswitch), which has an annoying
> > characteristic
> > in which it jumps frequency a few cycles on a random basis. I have
> > replaced both the VR tube and the oscillator tube several times and
> > it still
> > occurs. Over the years, I have replaced nearly every resistor and
> > cap
> > (except the tuning cap) in it with modern ones as they drifted out
> > of spec.
> > Calibration is about as good as I have seen, and there is no drift
> > or chirp
> > on any of the bands I use ( I don't use it on 10...yet). I have
> > checked all
> > components for looseness, including the slugs, and nothing is loose
> > anymore.
> >
> > Yet I still get the jump whether I am using the 160 meter or 40
> > meter
> > output.
> >
> > Anyone have a similar experience? If so, what did you do to fix it?
> >
> > The VF-1 I used with my modified DX-35 ("economy"power supply
> > with a heavy enough power transformer, SS rectifiers, decent meter,
> > and
> > got rid of that idiot series osc/buffer across the HV idea), to
> > drive a BC-
> > 610 for RTTY in the 1960s never did this...
> >
> > Ken Gordon W7EKB
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