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G8MNY > TECH 31.12.02 14:32l 46 Lines 2122 Bytes #999 (0) @ WW
BID : 2117_FG1JD
Read: GUEST OE7FMI
Subj: 2M Cavity Filter
Path: DB0MRW<DB0RGB<OK0PPL<RZ6HXA<SP7MGD<7M3TJZ<F6CDD<FG1JD<FG1JD<VE2WXK<
F1FBB<ON4HU<ON0BEL<ON0AR<VK3TE<GB7YFS<GB7KHW<GB7CIP
Sent: 021229/0943Z @:GB7CIP.#32.GBR.EU #:34686 [Caterham] $:34686_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
Here under a cheap way to build your 2 meter band Cavity filter. VK2DKW sent to
packet a diagram for a cavity filter made of dog food cans, with which he
successfully eliminated heavy pager interference at his site on 2m.
Use the font "Terminal" to see all the details as the author intended them!
ß²ß__12 13
ÄÄÄ ÕÍÍÛ²ÛÍÍÍÑÍÍÍ1ÍÍÍÍÍÍÍÍÍÍ< <ÍÍÍÍÍÍÑÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ»
³ 12___/ ² ° > > ³ ³<-----50mm------>ºÉÍÍÍÍÍÍÍ»
³ ³ 6² °10 < < 33mm³ 11-̹ 3_ º
³ ÄÄÄßÄÄÄ2° > > Á ÀÄÄÄÄ7ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ(Ä* ) º
³ ÃÍÍÍÍÍÍÍ-Á----------5---< <---5--------------------½³ ³ º
100mm > > / ³ î º
³ ³ < < / ³ 4-î º-8
³ > > 9\ ³ î º
³ < < \ ³ î º
³ Ã--------Â----------5----> >--5--------------------·³ ³ º
³ / ° < < Â ÚÄÄÄÄ7ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ(Ä* ) º
³ ³ 14 °10 > > 33mm³ 11-̹ - º
³ \ ° < < ³ ³<----50mm------->ºÈÍÍͳÍÍͼ
ÄÄÄ Ô1ÍÍÍÍÍÍÍÏÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ> >ÍÍÍÍÍÏÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍͼ 3
³-------------------450mm--------- 13 --------------³
1 Dog Food Cans. 2«(Empty!) hihi, with Hole for Copper pipe
2 round steel plates, 30mm í. Lower one, soldered on copper pipe
3 UHF Socket SO239 Hole Mount.
4 Coil 1mm wire 9 windings inside í 10mm
5 Copper pipe, í 3/4in also 450mm long.
6 5mm screw with steel plate soldered to bottom end.
7 wire, Copper or Brass í 2mm
8 Aluminium Bracket.
9 Copper pipe soldered to bottom end of Can
10 Plastic spacer
11 Pop rivets í 3mm
12 2 5mm Nuts Soldered to outside and inside of can.
13 Wire no 7 soldered to outside of can.
14 Silicon to keep plastic spacer in place.
Pse direct any queries to George, VK2DKW@VK2WI.#SYD.NSW.AUS.OC
73 De John, G8MNY @ GB7CIP
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