I never take anything for granted when accuracy is desired.
I use a noise bridge and my receiver to zero in on the exact frequency, the
noise backround null is very pronounced with good coax. Beats turning on an
expensive VNA.
Carl
KM1H
----- Original Message -----
From: "HAROLD SMITH JR" <w0rihps@sbcglobal.net>
To: "Bob Kupps" <n6bk@yahoo.com>; "topband" <topband@contesting.com>
Sent: Monday, September 10, 2012 11:04 AM
Subject: Re: Topband: electrical wavelength
Hello Bob,
I have used the published velocity factors for years.
I made a 4:1 balan for my Telrex 20M546 a few years ago with RG14 coax.
After I
cut it, I checked it
with my GDO and all was fine.
73 Price W0RI
Hi it's still flooded here but I wanted to fire up one of my verticals by
itself
on 160 and feed it with a half wave of Comscope RG6 since I don't have
enough 50
ohm line to reach it. I have a AIM 4170 to cut the line with but my question
to
the group is - how much variation from published nominal velocity factors
have
you encountered in practice when cutting lines to length? How accurate do we
need to be for 1/4 wave lines?
73 Bob
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UR RST IS ... ... ..9 QSB QSB - hw? BK
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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