[From nobody Mon Jan 10 18:46:50 2011
Message-ID: &lt;33E7E4FA.5749C904@softhouse.com&gt;
Date: Tue, 05 Aug 1997 19:44:10 -0700
From: Multi-Volti Devices &lt;MULTI-VOLTI@softhouse.com&gt;
X-Mozilla-Draft-Info: internal/draft; vcard=0; receipt=0; uuencode=0; html=0
X-Mailer: Mozilla 4.01 [en] (Win16; U)
MIME-Version: 1.0
To: Ricky McNelly &lt;72507.235@CompuServe.COM&gt;
Subject: Re: [HomeBrew] SB-303 help
X-Priority: 3 (Normal)
References: &lt;970805022454_72507.235_EHM74-1@CompuServe.COM&gt;
Content-Type: text/html; charset=us-ascii
Content-Transfer-Encoding: 7bit

&lt;HTML&gt;
Most common problem with LMO drive is the friction drive wheel. There are
two disks that are wedged over the metal ring inside the 0-500 kHz dial.
Imagine putting a piece of paper between your first and second fingers.
This is what the drive looks like, if the paper represented the inner drive
ring and the fingers represented the two friction disks. They are basically
like two spring disks mounted on the end of a shaft.

&lt;P&gt;The disks often cracked. They are scarcer than hen's teeth, and eventually
crack. I fixed one once by applying solder to the back side of it (if I
remember they were copper), but I also made the problem worse the other
times I tried it. They have to apply compression to the drive ring, yet
must have some flexibility as well.

&lt;P&gt;Maybe&nbsp; you'll luck out &amp; it only needs to be cleaned. Only
clean the external drive at first.

&lt;P&gt;By disabling the drive, you can check the LMO internal drive mechanism
by turning it's shaft sfter it is disconnected from the front panel drive.
This way you can verify whether the problem is internal or external.

&lt;P&gt;There are several disks on the shaft that have tabs sticking out that
bump into the next disk in line with successive rotations of the shaft.

&lt;P&gt;You want to make sure the set screws there are tight, but don't loosen
them to check. If it rotates due to loseness, you will lose your linearity
and proper freq. range.

&lt;P&gt;It's a real pain in the neck to get it back to the correct position,
and meet linearity specs, especially without any service instructions for
the LMO (I don't have this either).

&lt;P&gt;Murray
&lt;BR&gt;&nbsp;
&lt;BR&gt;&nbsp;
&lt;BR&gt;&nbsp;

&lt;P&gt;Ricky McNelly wrote:
&lt;BLOCKQUOTE TYPE=CITE&gt;To: INTERNET:homebrew@qsl.net

&lt;P&gt;Hello,

&lt;P&gt;&nbsp;&nbsp;&nbsp; a friend is trying to get an old SB-303 receiver
working with its
&lt;BR&gt;companion xmitter as a back up radio for our club.&nbsp; The rig is
in good
&lt;BR&gt;shape and appears to operate but the tuning knob feels like its
&lt;BR&gt;binding and its very difficult to tune cw stations as a result.&nbsp;
My
&lt;BR&gt;friend believes the PTO is dirty and may need cleaning.&nbsp; We have
no
&lt;BR&gt;manuals.

&lt;P&gt;&nbsp;&nbsp;&nbsp; Any ideas or suggestions would be greatly appreciated.

&lt;P&gt;&nbsp;72/73's,

&lt;P&gt;&nbsp;--Rick, KE4IZH

&lt;P&gt;&nbsp;Chesapeake, VA 08/04/97.

&lt;P&gt;----
&lt;BR&gt;Submissions: homebrew@qsl.net&lt;/BLOCKQUOTE&gt;
&nbsp;&nbsp;&lt;/HTML&gt;

]