[Johnson] [Boatanchors] Johnson Mobile inquiry

[Michael Clarson]

What kind of mobiles are you speaking of? EF Johnson land mobile, or some
other Johnson? EFJ was a connector ans socket manufacturer, and it is
unlikely they would have an inferior product. --Mike


On Wed, Jan 8, 2014 at 9:14 PM, Brian Harris <cosmophone at yahoo.com> wrote:

> I am beginning a large equipment reduction.  Some of the first items to go
> will be some Johnson Mobile transmitters.  In anticipation of their sale I
> started working on them yesterday.  In doing so I discovered an unusual (to
> me) problem.
>
> Both of the SO-239 connectors on the rear of one unit (serial number
> 50191) had deteriorated to the point that the metal housings were crumbling
> to pieces.  These connectors were apparently not made by Amphenol, as they
> don't have their name stamped in the face as is typical.   In fact, there
> is no manufacturer's name on the connectors.  I am curious if anyone has
> seen this phenomenon before and if there is an explanation.  There is no
> other unusual metal corrosion/problem in the rig.
>
> If you've never had the joy of working on these rigs, specially the rear
> panel, I would avoid buying one that has connectors that need attention.  I
> had to remove the center conductors and insulators from two other SO-239s
> in order to have two empty housings into which I could insert the existing
> center guts from the old connectors.  This task took about two hours due to
> the tight quarters.
>
> If anyone is keeping track, I have serial numbers 50191, 50685, 50837,
> 50839 and 51121.  The latter has a small relay installed which I suspect is
> for PTT.  Does anyone have info on this change?
>
> Last, I'm looking for a parts rig or at least a good send/receive switch
> (rear wafer or entire switch) and a good front panel (one of mine is badly
> rusted).
>
> Thank you and very 73,
>
> Brian Harris WA5UEK
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