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#19
April 16th 09, 01:54 PM
posted to rec.radio.amateur.boatanchors
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S-38 Questions about alignment.
OK then I wasn't wrong about which band was the problem:-) However, in
the Rider's manual from Nostalgia Radio C-11 is shown as a fixed 2200 uuf cap. I also found a PDF of the original Hallicrafters handbook. This also shows a 2200 uuf fixed cap in the padder position. The component numbers are different from the Rider's sheets, in the Hallicrafter's book this cap is called C-16 and is listed as a 600V mica. For band-2 the only adjustment is the trimmer, C-21 (in the H book). If the low end is off or if the entire band is off I suspect C-21 or else coil damage. The S-38 does have an adjustable padder for Band-2 but the S-38A and S-38B do not. So, I suspect someone added the adjustable cap for some reason, perhaps because of the problem you are having. Anyway. I would remove it, put a 2200 uuf mica cap there and see what you get. If the thing is still off check the coils and value of the trimmer, maybe someone substituted it. -- Richard Knoppow Los Angeles WB6KBL Richard, Where did you find that manual? As a side note, if you look at the Nostalgia Air schematic it does show a padder on the band 2 position and it is bolted on the chassis with access holes from the top. Band 2 does have a 1200pf cap in parallel with the padder that is needed to align the 1.8Mc point. That cap is NOT depicted on the schematic. The padder does look factory as do the holes, wires and bolt through the chassis. And thanks again for all the comments and help, Thanks, Paul P. |
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