I have the same experience. 75 ohm stuff works great. The transformers
don't seem to be necessary for ham projects on two meters and above.
Return loss takes care of most SWR. Dave
______________________________ Reply Separator _________________________________
Subject: Re: [Repeater-Builder] Re: 75 to 50 ohm match
Author: <[email protected]> at Internet_mail
Date: 1/21/2004 5:29 PM
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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