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Re: [TowerTalk] Hardline ?

To: <Cqtestk4xs@aol.com>, <jim@audiosystemsgroup.com>, <TOWERTALK@contesting.com>
Subject: Re: [TowerTalk] Hardline ?
From: "Gary Schafer" <garyschafer@comcast.net>
Reply-to: garyschafer@comcast.net
Date: Mon, 20 Apr 2009 18:12:07 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
A 1/2 wavelength (or multiple of) of 75 ohm hardline could be used and when
hooked to a 50 ohm antenna, 50 ohms will be seen at the other end of the 75
ohm line.

73
Gary  K4FMX

> -----Original Message-----
> From: towertalk-bounces@contesting.com [mailto:towertalk-
> bounces@contesting.com] On Behalf Of Cqtestk4xs@aol.com
> Sent: Monday, April 20, 2009 5:16 PM
> To: jim@audiosystemsgroup.com; TOWERTALK@contesting.com
> Subject: Re: [TowerTalk] Hardline ?
> 
> 
> In a message dated 4/20/2009 9:03:09 PM Greenwich Standard Time,
> jim@audiosystemsgroup.com writes:
> 
> Bottom  line -- for a LONG run, the much lower loss of hardline as
> compared
> to  smaller coax is FAR more important than the slight increase in loss
> due
> to  mismatch.
> 
> 
> Agreed about the minimal loss, but there still is an issue of the mismatch
> coupled with a nominal SWR of maybe 1.2 or 1.3 that might appear even
> with
> using 50 ohm cable.  This, coupled with the mismatch of the 75 ohm  cable,
> also coupled with excursions up and down near the band edges could be a
> problem for solid state xcvrs and solid state amps.  Many get cranky when
> looking at SWRs of 1.5 or higher.
> 
> However, as you pointed out, loss due to mismatch is not a big  factor.
> 
> Bill KH7XS/K4XS
> **************Access 350+ FREE radio stations anytime from anywhere on the
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