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G8MNY > TECH 01.05.07 22:41l 72 Lines 1966 Bytes #999 (0) @ WW
BID : 12954_GB7CIP
Read: GUEST OE7FMI
Subj: 2 Element Weston QRO Tribander?
Path: DB0FHN<DB0FOR<DB0MRW<DB0ERF<DB0FBB<DB0IUZ<DB0GOS<DB0RES<ON4HU<ON0BEL<
GB7CIP
Sent: 070501/2004Z @:GB7CIP.#32.GBR.EU #:12954 [Caterham] $:12954_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
Hi anyone have the dimensions?
I picked up some of the parts of this beam & it
tuned up & works ok as a dipole with only 2 adjustments..
DIPOLE
1/2 of Dipole
TRAPS
Adjust for 10M L&C 15M L&C
10&15m __________________ Adjust for
------¿__________________ ³ ________ 20m
__________________()))) ))))) ________³============
------Ù ________³_________ Thin Tubing
2" Dia Tubing
<-- 1/4 wave @ 10m -->
<---------- 1/4 wave @ 15m ------------>
<--------- Electrical 1/4 wave @ 20m ------------------->
NO BALUN
The earthy side of the coax was strapped to the boom, this is a poor solution
instead of a balun, so 3M of coax as a choke at the dipole makes it much better
on 20m on the dipole tests.
2 ELEMENT
But adding the reflector screws up the match by I guess lowering the Z, but you
still see the band resonances SWR dips OK, but no where near 1:1 especially on
20m. ³
Ý 20ft ³
³ test Ý
³ mast ³
³ ³
³ o ³
ReflectorÃÄÄÄÄÄÄÄÄ´ Dipole
³ boom ³
³ ³
³ ³
³ Ý
Ý ³
³
There was no boom so all dimensions are a guess at the moment. Trying the old
balun strap did not help either.
3 ELEMENT
My aim is actually to swap the 300W max dipole on an old 3 element Molsey TH33?
tribander for the QRO dipole for /P use.
³
Ý ³
³ 20ft Ý ³
³ test ³ Ý
³ mast³ ³
³ o³ ³
ReflectorÃÄÄÄÄÄÄÄÅÄÄÄÄÄÄ´ Director
³ boom ³ ³
³ ³ ³
³ ³ Ý
³ Ý ³
Ý ³
³
But so far the SWR is still silly.
Any info on how to make it work please?
Why don't U send an interesting bul?
73 de John G8MNY @ GB7CIP
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