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G8MNY > TECH 14.09.04 18:36l 29 Lines 930 Bytes #999 (0) @ WW
BID : 10752_GB7CIP
Read: GUEST OE7FMI
Subj: Coax Sleeve Balun
Path: DB0FHN<DB0MRW<DB0RGB<OK0PPL<OK0PAD<OK0PCC<OM0PBC<SR7BBS<SP7MGD<ON0BEL<
GB7CIP
Sent: 040914/1139Z @:GB7CIP.#32.GBR.EU #:10752 [Caterham] $:10752_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY (new Aug 04)
This type of balun is to be found in most textbooks & many aerial designs. It
is a 1:1 balun & does not alter the impedance.
Balun is made from ¬ wave lengths of scrap coax (longer needed to cover the
fatter outer) brade or pipe over the top of the feeder. It is electricly
connected to the coax brade 1/4 wave from the balanced feeder connections.
ÄÄÄÄÄÄÄÄÄÄÄÄÄ¿
BALANCED ÚÄÄÄÄÄÄÄÄÄÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
BÄÄÄ) UNBALANCED FEEDER
BÄÄÄÁÄÄÄÄÄÄÄÄÄÄÄÄÂÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
ÄÄÄÄÄÄÄÄÄÄÄÄÄÙ
This works by hiding the unbalanced outer aerial connections from the outside
world so it can't radiate.
In practice I recommend heatshring sleeving & heat glue it used to seal the
add outer section.
Why don't U send an interesting bul?
/QSL
73 De John, G8MNY @ GB7CIP
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