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Re: Source for F to N/SO239 Adapters



Steve,

     Interesting test.  Seeing how both cables are supposed to be 100%
shielded.  I would be curious as to what connectors/adapters were used, and
how they were attached (solder or crimp).  I would also be curious to know
who made the cables (ie Belden, Times, Brand X etc.).  If the RG-6 had an
Aluminium shield and a solder connection it could be trouble.  I am also
curious as to how the cables compared to an open connector,  a shorted
connector, and the load attached directly to the connector.

    I guess I am just curious. Keep posting results so we can all learn!

73,
Joe
ka0yos@amsat.org

----- Original Message -----
From: "Diggs, Steve" <Diggs@daugherty.com>
To: "'Mike Murphree'" <n4cnw@knology.net>
Cc: <amsat-bb@AMSAT.Org>
Sent: Monday, February 26, 2001 10:22 AM
Subject: RE: [amsat-bb] Source for F to N/SO239 Adapters


> Good point, Mike. Didn't think about the impedance match aspect. Since
both
> RG58 and RG6 are both 75 ohm also, whereas 9913 is 50 ohm, wonder what the
> net-net effect is in each case.
>
> As a test this morning, I stretched out 150 feet of 9913 and 150 feet of
R6G
> I had surplus, and then respectively hooked a dummy load on one, then the
> other. Each was hooked to the 736 when the dummy load was attached. The
RG6
> was WAY noiser than the 9913.
>
> Maybe what my experience is showing relates to a noisy urban environment
and
> noise rejection as much as anything else.
>
> SD
>
> -----Original Message-----
> From: Mike Murphree [mailto:n4cnw@knology.net]
> Sent: 2/26/2001 10:16 AM
> To: Jon Ogden; Douglas Cole; w4epi@mediaone.net
> Cc: k6ccc@AMSAT.Org; amsat-bb@AMSAT.Org
> Subject: Re: [amsat-bb] Source for F to N/SO239 Adapters
>
>
>
> I think you are missing the point that the Drake converter was
> *designed* for 75 ohms to start with.  A 50 ohm connector will
> *create* a mismatch, but of course you will have that when you
> connect to a 50 ohm receiver anyway.  The converter has more
> gain than you can possibly use.  The F connector should be
> waterproof if applied properly and RG-6 is cheap and available
> in double shielded varieties if needed for isolation. There doesn't
> seem to be much advantage in changing the connector or the
> cable.
>
> 73 Mike N4CNW
>
> On Monday 26 February 2001 06:43 am, Jon Ogden wrote:
> > on 2/25/01 11:30 PM, Douglas Cole at n7bfs@qwest.net wrote:
> > > So , what did I do for the IF output of the Drake ?  , well
considering
> > > we are not all that worried about loss ( should be more than enough to
> > > drive a sensitive 2 meter rx input ) I removed the F connector and
> > > installed a bnc panel
> > > mount female that I had in my parts supply , worked out fine and is
nice
> > > for quick disconnect .....
> >
> > To me, that's a much better solution than an F connector.  Considering
the
> > F connector is 75 Ohms, you have an impedance mismatch right there.  And
a
> > BNC connector is going to have far less loss than an F connector (a BNC
> and
> > an N have the same internal construction (center pin, dielectric width,
> > etc). It's just the outer connector that's different.
> >
> > You and I were thinking the same thing!
> >
> > 73,
> >
> > Jon
> > NA9D
> >
> > -------------------------------------
> > Jon Ogden
> > NA9D (ex: KE9NA)
> >
> > Member:  ARRL, AMSAT, DXCC, NRA
> >
> > http://www.qsl.net/ke9na
> >
> > "A life lived in fear is a life half lived."
> >
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