Re: Re: SMA to BNC adapter

Should get one of these from " Waters & Stanton" uk
B.f.n.  ...... Phil.
----- Original Message -----
From: "Dave Martindale" <[email protected]>
To: <[email protected]>
Sent: Saturday, August 06, 2005 6:24 PM
Subject: [icomr2] Re: SMA to BNC adapter


>
> >I have a IC-R2 and absolutely love it, although I wish it has ssb as
> >well.  I am looking for a sma to bnc connector for it.  Does anyone know
> >where I might get one, I should have ordered the thing when I bought the
> >radio but didn't.  I would assume radio shack would not have or would
> >they?
> >
> I would suggest being very cautious about using BNC-mount antennas on
> the R2.  The SMA connector itself is physically rather small (6 mm/0.25
> inch in diameter), and mounts in the plastic R2 case using a small ring
> nut.  It can't handle a lot of side force.  Too much flexing could
> damage the case, or crack a solder joint between the antenna and RF
> circuit board.
>
> The antenna supplied by Icom screws all the way down the SMA connector
> and rests against the rubber of the earphone cover.  If the end of the
> antenna is pressed sideways by something (e.g. your ribs), at least some
> of this side force is transferred to the radio case through the outer
> part of the antenna base which is 12 mm/half inch in diameter.  The
> antenna itself is also short and pretty flexible, which also limits the
> force applied through the antenna mount.
>
> A standard SMA male to BNC female adapter screws onto the end portion of
> the radio's connector, so all side forces are transferred directly to
> the radio connector.  The adapter is usually most of an inch long and
> rigid, so it provides additional leverage for bending the connector,
> just like adding a piece of pipe to a pipe wrench handle.  And BNC
> antennas are often longer and heaver than SMA ones, too.  I have
> occasionally tried mounting a BNC antenna plus adapter on the R2, but I
> was too uncomfortable with the mechanics of it and ended up not using it.
>
> I *do* sometimes use other SMA-base antennas that don't seat down onto
> the rubber, but they are the "rat tail" type that have very flexible
> whips and a very short rigid portion at the base, so they can't exert
> much side force on the SMA connector.  I also sometimes use a SMA-to-BNC
> connector to attach a BNC-end antenna cable for a remote antenna.  In
> this case, flexing of the cable limits the force on the radio's connector.
>
> The SMA-to-BNC connector that someone occasionally offers on this group
> may work better; I don't have one.
>
>     Dave
>
>
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