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G0FTD > UPDATE 14.03.06 17:15l 15 Lines 647 Bytes #999 (0) @ WW
BID : 1B4089G0FTD
Read: GUEST
Subj: Re: A simple 3 ele yagi for 144Mhz
Path: DB0FHN<DB0MRW<DB0FSG<DB0PV<DB0ZKA<DB0GPP<DB0KTL<DB0ZDF<DB0LJ<DB0RES<
ON0AR<ZL2BAU<GB7ESX<GB7NNA
Sent: 060314/1337z @:GB7NNA.#31.GBR.EU #:01508 $:1B4089G0FTD [Witham, Esx]NNA
> A coaxial matching stub is used to match the driven element to 50ê due
> to the coupling effect of the other elements. Attach a length of approx
> 20cm RG58 coax at the feedpoint of the dipole (in parallel with the
> feeder cable and leave it open ended).
>
> Some trimming will no doubt be needed of the matching stub for best match.
> I find it best to star off with a slightly longer length than required
> and trim by *5 mm* each time. It is essential to trim by 5mm because the
> exact point of matching is quite narrow.
I recently changed from a coaxial stub to a 5-15pf trimmer across the
feedpoint. This too works a treat.
- Andy -
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