This is one of the reasons that I do not like the idea of running coax from
the tuner to the outside where it is then connected to a balun for the
purpose of using a balanced feed system. Oh I realize that the coax run is
short but at high SWR values coax gets very lossey. From my point of view I
rather deal with the balanced line, and it's not near as critical as most
think, all the way from the antenna feed point to the tuner/balun output.
I believe in extrapolating every tenth of a dB in performance out of a
system.
73
Bob, K4TAX
----- Original Message -----
From: "Rob Atkinson K5UJ" <k5uj@hotmail.com>
To: <tentec@contesting.com>
Sent: Thursday, October 06, 2005 4:18 PM
Subject: [TenTec] FW: [Fwd: Feedline loss calculator]
this was posted to tower talk reflector--it is a pretty cool calculator
that
lets you compare losses of different feedlines keeping other conditions
constant. compare for example the loss of 600 ohm open wire feed with
that
of RG213 on 7 mhz, for 100 feet and swr of 10:1
It may open your eyes about losses in your lines, especially on low
frequencies, that you may have assumed were negligible, even at low swr.
http://www.ocarc.ca/coax.htm
rob/k5uj
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