In principle, any *odd* multiple of 4.118 MHz (the frequency where the cable
is 1/4 wavelengths long) will work when the far end of the cable is
open-circuited. If you short-circuit the far end of the cable, then look
for X=0 at *even* multiples of 4.118 MHz.
73, John W1FV
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Ed
Stallman
Sent: Tuesday, July 12, 2016 11:05 PM
To: Topband
Subject: Topband: Cutting Delay Lines
I'm cutting a 40 degree and a 20 Degree Delay line using RG6 at 1.83MHz for
a receive 8 circle array ! I know the velocity factor of the RG6 and have
all the math worked out .
After doing the calculations and trimming the RG6 back , I'm looking for
X=0 at 4.118 MHZ ( or as close to X=0 as possible )
Now to my question: I'm finding the X=0 to be a broad range , looks to be +
- 50 KHz on my MFJ 259b .. I know , I need a better analyzer ...
Can I double of quadruple the frequency to narrow the span where X=0?
Thanks Ed N5DG
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