2-meter band cavity filter
Here's 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.
1 Dog Food Cans. 2 (Empty!) hihi, with Hole for Copper pipe
2 round steel plates, 30mm. Lower one, soldered on copper pipe
3 UHF Socket SO239 Hole Mount.
4 Coil 1mm wire 9 windings inside - 10mm
5 Copper pipe, - 3/4in also 450mm long.
6 5mm screw with steel plate soldered to bottom end.
7 wire, Copper or Brass - 2mm
8 Aluminium Bracket.
9 Copper pipe soldered to bottom end of Can
10 Plastic spacer
11 Pop rivets - 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.
Please direct any queries to George, VK2DKW@VK2WI.#SYD.NSW.AUS.OC
73 De John, G8MNY @ GB7CIP
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