[Collins] 51J parts

[Ian]

That's where you need the military R388 manual.

I spent quite a bit of time with that when I had parts remaining from a
51J/R388 that I was parting out.  More of them are the same than I thought
would be the case.  

Ian, K6SDE

-----Original Message-----
From: collins-bounces at mailman.qth.net
[mailto:collins-bounces at mailman.qth.net] On Behalf Of Lawrence Mayhew
Sent: Wednesday, April 30, 2008 10:52 AM
To: 'Bill Kirkland'; geraldj at storm.weather.net; collins at mailman.qth.net
Subject: RE: [Collins] 51J parts

While we are on the subject of the L-105 coil for the 51J series, may I ask
about the "tuning slugs"? Somewhere I got the idea that the slugs in the
tuning rack were not all the same permeability. I can't confirm it in the
technical literature. Anyone have an experienced opinion? 
Regards,..........Larry in Seattle

-----Original Message-----
From: collins-bounces at mailman.qth.net
[mailto:collins-bounces at mailman.qth.net] On Behalf Of Bill Kirkland
Sent: Wednesday, April 30, 2008 10:05 AM
To: geraldj at storm.weather.net; collins at mailman.qth.net
Subject: Re: [Collins] 51J parts

I've sent Ed the part.  The coil forms are tricky because they belong to a 
sub-assembly
which includes the tuning trim cap.  They are mounted as a package in the RF

section.
It would need to have identical characteristics as the other two coil forms 
used in the
RF deck for that band grouping so that they all track together as the 51J is

tuned
either across the band or as the band switch is changed.

If folks are interested, I can remove an another sub-assembly and photograph

it.

I didn't check the winding on L105 but I do know that the windings on some 
of the
coil forms connected to the IF tuning rack are not uniformly spaced wound.


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