SB-102 - more troubles

[Glen Zook]

There are two separate problems with the LMO.  The "warbling" is pretty common and is caused by the hardening of the "grease" used to lubricate the variable capacitor.  The "fix" is to clean the bearings and then use a good lubricant.

As for the calibration:  Unfortunately, the solid-state LMO used in the SB-102 was not built by TRW as were the tube type LMOs.  They are usually pretty close at the 100 kHz points but vary all over the place in between.  Now the tube type LMOs are well within 1 kHz all across the band.  Now there are a relatively few solid-state LMOs that are pretty accurate but, unfortunately, they are in a minority.

As for the "upper dial", they are only for a real rough estimation and there is slippage as you tune across the 500 kHz.  This is "normal" and you will get used to this.

Glen, K9STH

Website:  http://k9sth.com


--- On Tue, 7/14/09, Brian Wood <wood at LPBROADBAND.NET> wrote:

However, another problem has surfaced. Now, as I tune across the band, I find it hard to tune a signal in because it "warbles" as I get close. I have to move the dial back and forth near the signal until it stabilizes. Since the LMO is a preassembled solid-state one, I am hesitant to open it up. I suppose the dial could be slipping a little and I will check this as soon as I can, although visually it seems OK. Before I dig into it, I thought I'd check to see if anyone on the list has seen this same problem.
 
The dial calibration is also off pretty far - with the calibrator on, I have to move the hairline about 1/2" to the right. The upper dial is off too, which I recall being a typical issue with SB/HW-10x rigs. But they don't seem to change with use, so I don't really think they are slipping.


      

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