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
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