Help w/HW-101

[Ed Richards]

Jerry;

I find Heathkit's instructions on aligning a vfo confusing if not plumb
wrong. I use the following method on all vfo's, regardless of make, model
or frequency. It works!

As a rule of thumb, you set the tuning capacitor to fully meshed and
adjust the coil for  the lowest frequency of the vfo (not necessarily the
dial); then open the plates and adjust the trimmer capacitor for the
highest frequency of the vfo (not necessarily the dial), plus 1/2 the
error. In other words you over-correct. Go back to the lowest frequency
and set the coil "right on", back to the high frequency end and set it
"right on" plus 1/2 the error. Each time you do this the error becomes
smaller until you are "right on" at both ends.

I don't have time right now to look it up but I believe your vfo runs
from 5.0 mc to 5.5 mc, reverse frequency. That is the lowest frequency of
the vfo is the highest frequency on the dial. If you want, I will look it
up later and let you know. Good luck.

Ed Richards

On Tue, 6 Jun 2000 14:10:21 -0400 Jerry Kitterman <kitt5 at EARTHLINK.NET>
writes:
> Gang,
>
> I'am rebuilding a HW-101 from 2 or 3 units.
>
> Question:    I had to changeout the vfo and do quite a bit of work
> on it.  As it stands now Iam showing 4.000 at the end of the band as
> it should but it will only go down to about 3.680 or so and then it
> reaches the end of travel.  Of course, if you move the dial down to
> 3.500 and then "walk" the cal sig down to the same freq. you then
> have the same problem on the upper end and also by walking it down
> the freq does not seem to change very much.  I have actually never
> seen the whole band spread out from end to end as it should be.
>
> Should the vfo be removed and then change the dial to a different
> position on the dial drum or what.  All of this adjusting seems like
> a waste of time cause I know I'm not doing it right.
>
> Also, during vfo alignment it says to adjust the (2) trimmers on the
> side of the vfo to move the cal. sigs back in range at the low end
> of the band.  This is fine but it fails to tell one which trimmer to
> start with, back or front one and just how do you determine how far
> to adjust each one??  Do you adjust one so much and then switch to
> the other one or what??  I hope someone out there can make sense of
> my ramblings here and give me some pointers.  Thanks very much in
> advance.
>
> 73
> Jerry
> W9CTB
>
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