[Heathkit] Calibrating VF-1?

[Michael Waldrop]

You might want to perform the voltage checks on page 18 of the manual. I also
recommend checking the two grid leak resistors, 2.2K and 22K. The VF-1 is quite
old and with age resistors can and will change values which will affect the oscillator.

73
Mike
W5RKL


--- On Sun, 8/10/08, Bob Macklin <macklinbob at msn.com> wrote:
From: Bob Macklin <macklinbob at msn.com>
Subject: Re: [Heathkit] Calibrating VF-1?
To: "Kevin Ward" <n2ie at arrl.net>
Cc: heathkit at mailman.qth.net
Date: Sunday, August 10, 2008, 9:50 PM

Does it jump as you are changing the position of the main tuning capacitor
or as you are adjusting the coil?

If the coil is all the way to the max inductance you may have an bad or
unsoldered capacitor.

One thing to do is unscrew any solder lugs associated with the tuning
elements and retighten them.

Bob Macklin
K5MYJ
Seattle, Wa,
"Real Radios Glow in the Dark"
----- Original Message ----- 
From: "Kevin Ward" <n2ie at arrl.net>
To: "Bob Macklin" <macklinbob at msn.com>
Cc: "Randy Perkins" <w5kcm at sbcglobal.net>;
<heathkit at mailman.qth.net>
Sent: Sunday, August 10, 2008 7:21 PM
Subject: Re: [Heathkit] Calibrating VF-1?


> Randy -
>
> I agree with Bob - look closely at the main tuning capacitor,
> particularly the rotor wipers.  As to the drive issue; look in the AT-1
> manual.  IIRC, there is a circuit change for the crystal oscillator to
> kill the feedback and make it behave as a buffer.
>
> Kevin  N2IE
>
>