Re: NEC-LIST: horizontal quad loop - matching problem

Chris,

If you do decide to resistively terminate the loop, I have a
modification that increases the radiation efficiency to about 80% that I
have been wanting to try out for years.

   Dave Cuthbert

-----Original Message-----
From: nec-list-admin_at_gweep.ca [mailto:nec-list-admin_at_gweep.ca] On Behalf
Of chris Turner
Sent: Wednesday, July 07, 2004 12:13 PM
To: nec-list_at_gweep.ca
Subject: NEC-LIST: horizontal quad loop - matching problem

(long lines)

The following appeared on a technical news group and I too would like an
answer to this problem.
Can anyone help?

Yesterday I erected a horizontal quad loop for 160 between 4 wooden
poles 10m up.
It works OK on 160 and 80 TX and RX on all HF bands. No problem with a
ATU on the higher bands.
I used this very same antenna many years ago in ZS3 (now V51) with great
success, BUT, it
worked on ALL HF bands with low SWR (we then called it a German Quad).
I cannot recall what I did differently then and lost the original 73
Magazine article with all the specs, etc.
Current setup: feeding it with 50ohm coax to a 1:1 balun (yes I know the
match is not
perfect but this is the very same balun I used way back).
I vaguely remember something of a step ladder at the opposite end of the
cubica. Ideally I would
like to use a 2:1 or 3:1 balun. I don't want to use an ATU.

Any help, ideas and advice?

Chris Turner IEng MIIE
G4HKP
Tel: +44 1844 238502
Mob: +44 7812 174133

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