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G0FTD > TECH 07.10.07 14:09l 32 Lines 1196 Bytes #999 (0) @ WW
BID : 000586279PZT
Read: DG5YM GUEST OE7FMI
Subj: Re: VHF ATU Homebrew Design
Path: DB0FHN<DB0RGB<DB0PM<DB0PV<OE5XBL<OE6XPE<DB0RES<ON0AR<GB7YKS<GB7SYP<
GB7PZT
Sent: 071007/1158Z @:GB7PZT.#24.GBR.EU [Kidderminster] #:58600 XSERV410h
Date: Sun, 07 Oct 2007 12:58:12 +0000
From: g0ftd@gb7pzt.#24.gbr.eu (Andy)
To: tech@ww
Subject: Re: VHF ATU Homebrew Design
G8MNY wrote:-
> The value of the variable C will need to be smaller than 30pF for
> higher bands eg. 220MHz, & as large as 100pF for 50MHz, if a good
> impedance matching range is going to be obtained.
May I suggest if anyone is looking for suitable capacitors for such
projects to try J. Birkett (advertised in PW) or Mainline Electronics -
http://www.mainlinegroup.co.uk/ (I use both for my bespoke requirements).
No point giving out addresses/phone numbers because you really have to
see the ads or website to look up your requirements before purchase.
However the C801A100pF ranges from 4.5pF to 100pf from Mainline seems to
fit the job nicely for such a project [Tel:(+44) 0116 278 0980] at just
under 13 quid. This version requires M2.5 screws for fixing to a front
panel but if you want the nut fixing on the shaft version then it's the
C804 version you'll need.
J. Birkett is worth trying as he often has cheaper prices assuming he has
what you want.
This information provided to encourage homebrewers to keep homebrewing !
- Andy -
G0FTD @ GB7PZT
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