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Re: Need recommendations on 435 yagi feed



The two Ohms won't matter.  If you want to spend more money you can go to

http://www.cablexperts.com

Click on 75 Ohm cable.  Near the bottom of the page they have RG180/U which
is 95  Ohm.

73,
Joe
ka0yos@amsat.org

----- Original Message -----
From: "Floyd Sense" <sentek@sprintmail.com>
To: <amsat-bb@AMSAT.Org>; "Douglas Braun & Nadia Papakonstantinou"
<doug@dougbraun.com>
Sent: Thursday, September 13, 2001 6:48 PM
Subject: Re: [amsat-bb] Need recommendations on 435 yagi feed


> Close, but no cigar!  RG-62 is indeed quite common, but it's 93 ohms not
95
> as is RG-133.  I'm certainly open to anyone who can speak with authority
to
> tell me that the 2 ohm difference won't matter.  I'm not capable of making
> that judgement myself.  By the way, the RG-62 pre-dates LANs by a decade
or
> so.  It was used in 3270 display systems as the signal carrying cable
> connecting the keyboard/display terminals to the control unit.  If done
> properly, you could run the cable up to 5000 feet, but I think the
> recommended limit was 2000 feet or so.  The frequency used was rather
low -
> less than 5 MHz as I remember.
>
> K8AC
> Floyd Sense - Angier, NC
> ----- Original Message -----
> From: "Douglas Braun & Nadia Papakonstantinou" <doug@dougbraun.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Thursday, September 13, 2001 17:33 PM
> Subject: Re: [amsat-bb] Need recommendations on 435 yagi feed
>
>
> > In the USA at lest, all the ham cable/connector vendors seem to
> > carry it.  And it is pretty cheap.  It was originally meant for
> > some sort of IBM LAN technology (token-ring?), so lots of it was sold.
> >
> > Doug
> > NA1DB
> >
> > At 03:59 PM 9/13/01 , John Wright wrote:
> >
> > >The 95 ohm coax is very hard to get. BUT if you take the appropriate
> length of 50 Helix cable ( like Pope H100 ), pull out the center conductor
> and replace it with a thinner center conductor, Not sure how thin, but
that
> can be calculated, you can make yourself a piece of what should really be
> 100 ohm cable. N 'T' pieces are about £10 stirling in the UK ( about
$15 ),
> so you should be able to get them for less than the price you quoted. I
used
> this system many moons ago in AO13 days. so it works. Incidentally the 1"
> offset of the feed point makes very little difference to the phasing.
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
>
> ----
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>
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