The grommet is to weather proof the connector. If you have the "knife edge"
type shield retaining washer (where the grommet fits over the "knife"
edge), you will find that the grommet is split into two concentric pieces
when you apply correct torque to the retaining nut. It adds little to the
retention of the coax.
73 de Perry - K4PWO
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of jimlux
Sent: Wednesday, March 10, 2010 10:33 PM
To: Tower and HF antenna construction topics.
Cc: w4lde@numail.org
Subject: Re: [TowerTalk] N - clamp style connector
Steve Katz wrote:
> As someone who's actually set up assembly lines to install Type N
> military connectors for USAF contracts (20+ years ago!), I might add one
> of the biggest problems hams have is misapplication of connector vs.
> coax. Even a skilled expert who's assembled thousands of N connectors
> on cables is going to be highly challenged if the right materials aren't
> presented to him.
>
> As an example, I see a lot of hams using the UG-21D/U connectors from
> the Amphenol "RFX" series (82-202-RFX or equivalent). You might note
> those are intended for "RG8, RG9, RG213, RG214" cables. Well, this is
> downright impossible. RG8 and RG213 are single shielded and smaller in
> O.D. than RG9 and RG214 which are double-shielded. For a "clamp"
> connector, how can a single design work for cables having either one or
> two shields, and having two different O.D.s? Impossible.
>
> So what Amphenol did, in their infinite wisdom, was make the connector
> suitable for double shielded cable with a larger O.D., and figured
> somehow we'd make that work for the other stuff. It really doesn't.
Isn't that why there's little funky rubber/silicone grommet looking
things in some installation kits. I always figured they're to make the
cable "thicker" so it fits the connector.
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