[TMC] SBE-9 question

[triodes at optonline.net]

Hi Nick,

Perhaps Bob McLain can look up TMC assembly no. A4403-0 in the TMC dwg. archives. That dwg should reference the parts list for that assembly, and that would verify the part no. for that toroid. It should then be a an easy matter to pull the TMC spec for the toroid.

Just my $0.02.

73,

Bruce, W2XR

----- Original Message -----
From: Nick England 
Date: Wednesday, January 25, 2012 9:51 pm
Subject: Re: [TMC] SBE-9 question
To: John Vendely , John Poulton 
Cc: tmc at mailman.qth.net

> FWIW department - Here's a photo of my SBE-9's phase shift circuit
> board located near T127. The toroidal xfmr is clearly not 
> original but
> I don't know what the original was actually like (TMC TF228K15 4.7mh
> pulse transformer). Anyone? anyone?
> http://www.navy-radio.com/xmtrs/tmc-comp/sbe9-phase-01.jpg
> cheers,
> Nick K4NYW
> 
> On Wed, Jan 25, 2012 at 7:59 AM, Nick England 
> wrote:
> > So last night I went belowdecks (Navy radio gear is in the basement)
> > to see what was happening with this AM isssue and the carrier phase
> > shifter. Found the phase control but tweaking it just caused a
> > reduction in carrier insertion and no phase change - huh? So started
> > hooking up the scope to the components in that circuit with more
> > puzzling results. Ended up unsoldering the little add-on board and
> > found out that at some time the transformer had been replaced and
> > miswired. So I wired it back and now I get some shift but 
> there is
> > sizable 250kc signal loss here - maybe I guessed wrong about 
> the xfmr
> > leads. The replacement is a (homebrew?) toroid, where the 
> manual has a
> > TMC pulse xfmr part number. Maybe it never would work as "repaired".
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