I can vouch for this,found no discernable difference on VHF between a
run of 7/8 Andrews and a run of jacketed CATV aluminum. Identical
performance,cheaper price and no matching stubs.73,Lee,N3APP

----- Original Message ----- 
From: "Dexter McIntyre W4DEX" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, January 21, 2004 10:05 AM
Subject: Re: [Repeater-Builder] Re: 75 to 50 ohm match


> I have seen 75 ohm cable work well with 50 ohm systems.  The slight
loss
> due to VSWR is offset by less loss in 75 ohm over 50 ohm for the
same
> size cable.  If one wants to trim the cable to provide a perfect
match I
> would suggest this method.  Measure the power at the output of the
> transmitter into a 50 ohm load.  Connect the 75 ohm coax and move
the
> wattmeter and load to the distant end of the cable.  If the power
> measured here differs much from the first measurement less the
speced
> loss of the cable then trim the cable length to optimize the power.
I
> think that trimming the cable for best VSWR at the transmitter end
but
> external to the transmitter may not give a true indication of what
the
> transmitter is loading into.
>
> Dex





 

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