[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

RE: Source for F to N/SO239 Adapters



Hi Steve...I think you meant RG-59 coax as being 75 ohm??...Not RG-58 which 
is 50 ohm.....Lonnie  (NT6B)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
At 10:22 AM 2/26/01 -0600, Diggs, Steve wrote:
>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."
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>----
>Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
>To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
>----
>Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
>To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

----
Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org



AMSAT Top AMSAT Home