SB-102 LMO

Glen Zook gzook at YAHOO.COM
Sun Jun 23 23:09:13 EDT 2002

I am in the process of trying to get an SB-102
repaired for a friend and the main problem is the
solid-state LMO.

I now have available a total of 5 LMO units, of two
different physical layouts, but are for the SB-102.
All five of them when the "end points" are "on" (that
is exactly 5 revolutions goes from 5 to 5.5 MHz) the
intermediate 100 KHz points are off from 3 to over 10
KHz depending on the individual LMO.  This has been
checked both with a frequency counter and in the unit
itself "on frequency" (i.e. 3.5 - 4.0 MHz received).

Now, nominally, Heath LMOs are well within 1 KHz at
the intermediate 100 KHz points.  At least this is my
experience with the tube type units.  However, my
experience with the solid-state LMO units is minimal
(have worked on numerous tube-type LMO units).  Since
this trait is the same on 5 different units, I am
wondering just how close the "tracking" is normally on
the solid-state LMOs.

The physical differences between the two types is
considerable.  Primarly the only things common are the
tuning shaft, the 3 terminal power strip, and the
ridge for mounting the upper portion of the dial

Frankly, since all 5 units show the same type of
problem, I am really wondering about the tracking
ability of the solid-state LMO units.  Of course
Murphy never takes a vacation, but it is strange that
5 different units have the same problem.

Any ideas?  Any suggestions as to how to get the
frequency to track closer (yes, I know that the
slotted variable capacitor plates can be adjusted - a
real pain!).

Glen, K9STH

Glen, K9STH

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