sb-303 LMO problem

[Dick Blaney]

I think it may be specific to a particular receiver.  I have two
SB-303s and one works fine without the dummy HFO load, while the other
acts up somewhat like this one does.  The one that acts up was sold by
Heath as an assembled receiver, along with an assembled SB-401, but
the one that doesn't seem to need the load was kit built.  The only
thing I see on the one is that the calibration shifts several kcs
without the load.
73 de
Dick, WB8MHE
wb8mhe at bright.net

-----Original Message-----
From: Dave Edwards <ham at CYBERCOMM.NET>
To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
Date: Monday, August 30, 1999 10:15 PM
Subject: Re: sb-303 LMO problem


>I wonder if that has to do with revisions of the 303. I have used
mine quite
>a bit without the SB401, and never added a load to the LMO jack. I
also do
>not remember a mention of that in the manual. I will have to look
again.
>By the way 303 owners.... I have another 303 that someone added the
noise
>blanker from the SB104. There was an article on doing that in 73
magazine.
>I don't like major mods like that, but boy...it sure works well!
>...Dave
>-----Original Message-----
>From: wa1vwl <wa1vwl at GROLEN.COM>
>To: HEATH at LISTSERV.TEMPE.GOV <HEATH at LISTSERV.TEMPE.GOV>
>Date: Monday, August 30, 1999 6:56 PM
>Subject: Re: sb-303 LMO problem
>
>
>>Had a similar problem last year when I bought an SB-303 for the
princely
>>sum of fifty bucks. Took it home, turned it on, and...same results
you
>>got. Way back in the bowels of the SB-303 manual is a short note
>>addressing that problem. It seems there's supposed to be a 50 Ohm
dummy
>>resistor plugged into the LMO OUT jack when the 303 is used by
itself .
>>When I plugged one in, the LMO behaved. The previous owner didn't
try
>>that, apparently. Tried to pry open the LMO with what seemed to be a
can
>>opener. At least the results seemed to be that way. The 50 Ohm
resistor
>>is not needed if you plan to use the 303 with the SB-400/401. Check
the
>>transmitter manual for more precise info.
>>
>>73/Gerry/W1ID
>>
>>Rick Booth wrote:
>>>
>>> I have a sb-303 with a LMO that appears to have gone goofy.  It
works ok
>for about the
>>> first 25 KHz, gets severly distorted for about the next 25 KHz and
then
>gives up entirely.
>>>
>>> I need a schematic if that is possible.  That will save me the
hassle of
>tracing out
>>> whatever is lurking in that dang box.
>>>
>>> Thanks in advance.
>>> Rick
>>> w6nzk
>>>
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