Motorola Connectors?

Dave D

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Dec 5, 2009, 6:45:40 PM12/5/09

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I need to install a few of the old style Motorola connectors to use
with some equipment that uses them. Just wondering if anybody knows
the proper way to do them. I assume you just solder the center through
the tip... But I'm not quite sure what the proper thing to do with the
braid is.

Thanks for any help.

Sal M. Onella

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Dec 11, 2009, 11:12:30 PM12/11/09

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I would just tin the braid and solder it to the outer shell. You can
make it look better with a little heat-shrink tubing.

Sal

Dave D

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Dec 31, 2009, 3:54:50 AM12/31/09

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On Dec 11, 8:12 pm, "Sal M. Onella" <sob...@cox.net> wrote:
>
> I would just tin the braid and solder it to the outer shell. You can
> make it look better with a little heat-shrink tubing.
>
> Sal

OK, thanks... I figured that would probably do it. I thought maybe
there was some zazzy way that I was missing. I've never seen a factory
one done, so I have no idea.

Ed

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Dec 31, 2009, 2:36:26 PM12/31/09

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>>
>> I would just tin the braid and solder it to the outer shell. �You can
>> make it look better with a little heat-shrink tubing.
>>
>> Sal
>
> OK, thanks... I figured that would probably do it. I thought maybe
> there was some zazzy way that I was missing. I've never seen a factory
> one done, so I have no idea.
>

Well, there IS a bit of a "zazzy" way... I have seen done on a very
few factory connectors..... the connector is installed with very short
braid...the short braid is fanned out a bit... the connector back end is
pushed under the braid about 1/4", and the braid brought down tight over
the back end... then a small bit of tinned copper wire is wrapped over that
braid ... you will note that the back end of othe connector is bent in a
fashion that makes this easy. Then that wire and braid is all soldered to
the connector. A lot of work for really no gain, I think.... but it looks
nice.

Ed K7AAT

Roy Lewallen

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Dec 31, 2009, 7:00:05 PM12/31/09

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Ed wrote:
>
> Well, there IS a bit of a "zazzy" way... I have seen done on a very
> few factory connectors..... the connector is installed with very short
> braid...the short braid is fanned out a bit... the connector back end is
> pushed under the braid about 1/4", and the braid brought down tight over
> the back end... then a small bit of tinned copper wire is wrapped over that
> braid ... you will note that the back end of othe connector is bent in a
> fashion that makes this easy. Then that wire and braid is all soldered to
> the connector. A lot of work for really no gain, I think.... but it looks
> nice.
>
> Ed K7AAT

There actually are benefits to soldering the shield all around the
shell. If you don't, an impedance increase occurs where the field is
allowed to escape the region between the center conductor and shield.
This isn't a problem in most amateur applications, and likely not a
problem in other applications, either, if a non-constant impedance
connector is being used in the first place. Possibly more important,
though, is that you've allowed a path for common mode current, that is,
current on the outside of the shield. In addition, the increased
impedance of the desired current path encourages the flow of common mode
current. The main effects of the common mode current are radiation from
the coax when transmitting, and pickup of local noise when receiving.
These might or might not present a problem, depending on individual
circumstances.

Roy Lewallen, W7EL