SB-102 LMO

[Gary Schafer]

Hi Glen,

You might try to align the LMO at a different place for the end settings. In other
words try moving the shaft either up or down in frequency from where it is now a
little and then reset the end frequencies with the coil and cap. It may track
better if you can get the spread right at the new position.

73
Gary  K4FMX


Glen Zook wrote:

> 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
> assembly.
>
> 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
>
> Web sites
>
> http://home.attbi.com/~k9sth
> http://home.attbi.com/~zcomco
>
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