[UK-CONTEST] NFD Bracknell ARC G4BRA/P Low Power

[Brian Miller]

Hi Dave

Our open wire 600 ohm feeders at ZL6QH contain 90 degree bends and seem to work just fine. There
does not seem to be any noticeable variation in SWR resulting from the use of such bends.

73

Brian ZL1AZE


----- Original Message ----- 
From: "Dave Lawley" <g4buo at compuserve.com>
To: "UK Contest Reflector" <uk-contest at contesting.com>
Sent: Monday, June 13, 2005 5:06 AM
Subject: Re: [UK-CONTEST] NFD Bracknell ARC G4BRA/P Low Power


Nice writeup and pictures Dave

I was always told by G3RZP that you should avoid sharp bends in open
wire feeder, as you can get reflections from the bend if you're unlucky.
This is borne out by the text on page 12.31 of the fifth edition of the
RSGB handbook, which judging from the prose style was written by G6XN.

Clearly this doesn't seem to cause problems in your case and I guess it
is partly dependent on the precise length of feeder. I have always been
careful to split sharp bends up into a couple of 45 degree bends where
possible. Anyone else care to comment on whether or not it is important
to avoid sharp bends in open wire line?

Dave G4BUO

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