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G8MNY > TECH 13.11.04 12:52l 32 Lines 1151 Bytes #999 (0) @ WW
BID : 19851_GB7CIP
Read: GUEST
Subj: Coiled Choke Balun for HF
Path: DB0FHN<DB0MRW<OK0PPL<DB0RES<ON0AR<ON0AR<F6KMO<EA5DVS<ED1ZAC<CX2SA<
GB7CIP
Sent: 041113/1109Z @:GB7CIP.#32.GBR.EU #:19851 [Caterham] $:19851_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY (New Aug 04)
A very practical Balun for HF aerial work is the choke type. It reduces RFI to
& from the feeder & at next to no cost or loss. :-)
This can be placed at the rig end if using only balanced feeder or where the
coax is connected to a balance feed.
Balanced Joiner Plastic
ÍÍÍÍÍÍÍÍÍÍÍÍ:ÍÍÍÍÍÍÍ» Tape ÉÍÍÍÍÍÍ(Ä
feeder Block c)))))))))))o PL259
Ferrite Rod
Wind 20 turns or so of bell/LS wire around a 14cm x 8mm ferrite rod from an old
MW radio (or 10 turns on a medium-large sized ferrite ring). Tape it on firmly
to provide some protection against damaging the ferrite.
Collect onto a PL259 plug. Pass one of the stripped wires through one of the
outer case holes, while at the same time push the other one through the centre
pin. Be careful that the heat does not damage the wire insulation when
soldering up.
Put a joiner (2 way block) on the balanced end, so there is no excuse to
throwing the ferrite balun around when /P.
Why Don't U send an interesting bul?
/QSL
73 De John, G8MNY @ GB7CIP
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