GR 78

[Ed Richards]

Hi, Bill;

I have aligned hundreds of radios in my 55 years of repairing them. I
find Heathkit's alignment information very difficult if not sometimes
impossible to do. Close the book and do the following....it works every
time for me:

Close the tuning capacitor and tune the coil for the low frequency end of
the band. Open the tuning capacitor and tune the small trimmer capacitor
(sometimes built into the Gang) for the high end of the band, then go a
little farther in the same direction. Close the capacitor and reset the
coil, go a little farther in the same direction. Keep this up until you
walk the frequencies into place. If this doesn't work, look for a
defective component, physical short/open, wired wrong, etc. Good luck and
Merry Christmas.

Ed Richards
CET, !st class Commercial, Amateur Extra, and all that.

On Fri, 21 Dec 2001 15:47:34 -0600 "W.A. Strong" <maytag at WECNET.COM>
writes:
> Need help in getting  GR 78 aligned .
>
>  All my attempts to set the frequency(s) are frustrating ( a very
> mild term)
>
> Problem is I cant get it  in the freq range -- Adjustment ment of
> the slugs and the caps in the circuits always give the same
> response- The frequency range is shifted as a complete move.. If I
> move or try to change the top end the low end will move the same way
> the same amount..  Is there something I am missing in that I cannot
> make any adjust to one end or the other .  40 meters not obtainable
> the high end is 7005,  can't get 80 tuned  either .
>
>  Another question : Is there any decided difference in the capacity
>  features of copper plates versus aluminum?
>
> In this receiver  3 sections,  2 have aluminum plates and one
> section copper.  (VFO) circuit.
>   The aluminum ones are identical. The section with copper plates
> has  more plates than the others .  Readings of the capacity  gives
> me  lower  than the aluminum ones with less plates .
>  Readings are capacitor only  nothing else connected to it.
>  Bill
>  maytag at wecnet.com

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