SB-301 LMO issue

[Mark Johnson]

Janusz, assuming the radio worked OK before, its something that has changed 
since you've swapped LMO's. Check the LMO wiring; the B+, USB/LSB switching 
voltage, & heaters. You can verify LMO operation by checking the 5 mhz to 
5.5 mhz output. Put a freq counter on the LMO output and see if the LMO's 
output tunes 5 to 5.5 mhz. If you don't have a freq counter, just put a test 
lead on the LMO output and using a general coverage receiver, you should 
hear the signal at 5 to 5.5 mhz as you tune the LMO.

I know that from working on the LMO's,  the little stop washers on the 
shaft, (I think there are 3 or 4 of them) can "jump" and your variable 
capacitor stop points will be altered. Your "stop" points should occur at 
full mesh and full open, with some latitude. Again, check for 5 to 5.5 mhz 
output.

Also, as I think this through a bit, does this problem occur on all bands? 
If so, then its in the LMO.

Mark V Johnson VE3DJU/VE3DDI
----- Original Message ----- 
From: "Janusz Juryk" <ve2zhp at YAHOO.CA>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Sunday, December 30, 2007 8:18 PM
Subject: [HEATH-TEMPE] SB-301 LMO issue


> Greetings All,
>
> Couple of months ago I needed help in solving a
> problem with drifting. Many responded and with all the
> advice on how to clean the LMO I took to task to take
> apart the LMO and a spare one that I had, clean them
> and reassemble them. Today I installed one, wired it
> up, installed the face plate, all the knobs plugged it
> in and discovered that it was off frequency. Compared
> with my SB-102, on the SB-301 it was off by 38khz. In
> the CAL mode instead of the signal being at every
> 100khz, it is found at every 60 khz.
> I swapped the LMO for the other one thinking it was
> the 1st LMO but no, same thing with the 2nd LMO.
>
> Need help. Does anyone have a solution for this issue?
>
> Thanks and Best wishes for 2008 to ALL.
>
> Janusz  ve2zhp
>
>
>      Looking for a X-Mas gift?  Everybody needs a Flickr Pro Account.
>
>
>
> http://www.flickr.com/gift/
>
> -----------------------------------------------------------
> Products bought, sold or traded here is the responsibility of the
> parties involved.  This list and the City of Tempe are not responsible
> for losses or misrepresentations of any kind.  Buyer beware!
>
> -----------------------------------------------------------
> This list is a public service of the City of Tempe, Arizona
> -----------------------------------------------------------
>
> Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
> To post - HEATH at LISTSERV.TEMPE.GOV
> Archives - http://listserv.tempe.gov/archives/HEATH.html 

-----------------------------------------------------------
Products bought, sold or traded here is the responsibility of the
parties involved.  This list and the City of Tempe are not responsible
for losses or misrepresentations of any kind.  Buyer beware!

-----------------------------------------------------------
This list is a public service of the City of Tempe, Arizona
-----------------------------------------------------------

Subscription control - http://www.tempe.gov/lists/control.aspx?list=HEATH
To post - HEATH at LISTSERV.TEMPE.GOV
Archives - http://listserv.tempe.gov/archives/HEATH.html