[Heathkit] SB-102 LMO

Mon, 24 Jun 2002 22:30:07 -0400

Hi Glen,
  Maybe a new LMO.
I have 2 new unused LMO's from a SB303 (I'm fairly sure), I don't know if 
their the same animal or not ??  do you ???

cheers David ve3bbn

>From: Glen Zook <[email protected]>
>To: [email protected]
>Subject: [Heathkit] SB-102 LMO
>Date: Sun, 23 Jun 2002 20:08:10 -0700 (PDT)
>
>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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