[Heathkit] alignment of sb-303

[Glen Zook]

The original manual for the SB-303 definitely aligns the heterodyne oscillator before doing anything else!
 
Glen, K9STH


Website:  http://k9sth.com



On Tuesday, January 28, 2014 4:32 PM, Bill Cromwell <wrcromwell at gmail.com> wrote:
 
On 01/28/2014 11:42 AM, wt4t at reagan.com wrote:
>               Started to do a complete alignment on my Sb-303,following the book on the no test gear alignment. Every thing went normal 80,40, 20 and 15. Going to 10 meters could faintly hear the 100 kc tone and could get next to nothing increase working with the coils for ant and RF coils. they do work in the sebce they I can lower the signal ,but not peak the signal.
>         When going back to normal operation of the rig the pre selector is sharp and defined 80  to 20 meters, not so much on 15 and no peak of any kind on 10 meters, any position. Could this have any thing to do with the HET osc adjustments which I have not done yet?
>          Just looking for a push in the right direction .
> thanks
> dale wt4t
>
>
Hi Dale,

I don't have a Heathkit SB-303. I don't have the manual you are looking 
at. I have a radio from a different manufacturer with pretty much the 
same scheme - same IFs, filters, and all. Mine says to do the heterodyne 
oscillators *first*. I wonder why they would want you to do it backward 
in the Heathkit. I would suggest getting the xtals for the bands that 
are weak first and then repeak the rf and antenna.

Does "no test equipment" mean you don't have a way to measure the 
frequencies those oscillators (xtals) are operating or peak them? No RF 
probe for your VTVM? You don't need a 5 million dollar radio lab but you 
should try to get some of the stuff like a VTVM and frequency 
measurement. Those can be built at home but many are available for cheap 
at hamfests, used - probably for not much more than the cost of buying 
parts to build your own.

Good luck with your radio.

73,

Bill  KU8H


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