Quote:
Originally Posted by Jeffhs
When I shifted the alignment to get back the low end of the broadcast band, however, it caused another problem. The dial calibration is just about correct from about 970 kHz to the top of the band, but below 970 the calibration is off. I read somewhere that this is a common problem when aligning these radios; I wonder why. Was there something about the design of the local oscillator in Zenith TO's (my TO 1000 has the same problem) that makes it difficult, if not downright impossible, to get proper tracking across the entire broadcast band? I have read that it is quite difficult with these radios to get accurate tracking across the entire band, so most owners of these sets just tolerate the problem. Was this problem actually as bad as it seems, or is there some trick to aligning these radios so that the tracking is reasonably good across the entire band?
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The alignment procedure for these sets is somewhat complicated, but if followed correctly, using the proper equipment, good dial calibration and sensitivity over the entire band may be achieved. I suspect that your set has been "messed with" by someone lacking the proper equipment/skills to do a proper job. I don't believe that there is any inherent design problem that affects dial calibration on these sets.
jr