Tuning problem in SB-101

[Morris Dillingham]

Check the files section of the Heath list on Yahoo.  I recently reworked my
SB-301 LMO with a similar problem.  Your idea about stuck washers is a good
one but if you do have to disassemble the LMO, the write-up in the files
section of the Yahoo Heath list may help.  Note that if the upper end of
each band tunes too high, the LMO may not be centered in its range.
http://groups.yahoo.com/group/heathkit/files/


Good luck with your good deed,

Morris ki4iua



> -----Original Message-----
> From: Heathkit Owners and Collectors List [mailto:HEATH at LISTS.TEMPE.GOV]
> On Behalf Of Kenneth G. Gordon
> Sent: Thursday, September 04, 2008 12:14 AM
> To: HEATH at LISTS.TEMPE.GOV
> Subject: Tuning problem in SB-101
> 
> I am attempting to resurrect an SB-101 that has been
> stored for about 20 years. This rig will be used by a retired,
> handicapped policeman, so I want it to work correctly.
> 
> At the moment, the only really serious problem I am having
> with it is that it will not tune below 25 Khz above the bottom
> of each band.
> 
> The LMO is acting like an internal stop is incorrectly placed.
> The frequency is correct. It just won't tune below, for
> instance, 3575 Khz on 80 meters.
> 
> However, as I remember it there are a stack of "washers"
> (for want of a better word) on the shaft. Each washer has a
> short "lever" on an edge, with the end of the lever turned
> down, and after the operator has turned the shaft a certain
> number of turns, those turned-down ends all line up and act
> as a stop.
> 
> I am wondering if it is possible that two or more of those
> things has "stuck"?
> 
> I seem to remember that someone else here had a similar
> problem a couple of years ago, but can't find the discussion
> in the archives.
> 
> Anyone remember the problem and how to fix it?
> 
> I really don't want to dismantle the LMO, but at this point I
> don't think I have much choice.
> 
> Suggestions?
> 
> Ken W7EKB
> 
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