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G8MNY  > TECH     18.02.25 16:54l 51 Lines 2218 Bytes #5 (0) @ WW
BID : 26290_GB7CIP
Subj: 2m Cavity Filter
Path: JH4XSY<IW0QNL<IZ3LSV<DB0ERF<DK0WUE<DK0WUE<K7EK<W0ARP<LU9DCE<GB7YEW<
      GB7CIP
Sent: 250218/0746Z @:GB7CIP.#32.GBR.EURO #:26290 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
By VK2DKW
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!

           ﾟｲﾟ__12                        13
 ﾄﾄﾄ    ﾕﾍﾍﾛｲﾛﾍﾍﾍﾑﾍﾍﾍ1ﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍ<   <ﾍﾍﾍﾍﾍﾍﾑﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍｻ
  ｳ  12___/ ｲ    ｰ               >   >   ｳ ｳ<-----50mm------>ｺﾉﾍﾍﾍﾍﾍﾍﾍｻ
  ｳ     ｳ  6ｲ    ｰ10            <   <  33mmｳ              11-ﾌｹ  3_   ｺ
  ｳ      ﾄﾄﾄﾟﾄﾄﾄ2ｰ               >   >   ﾁ ﾀﾄﾄﾄﾄ7ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ(ﾄ* ) ｺ
  ｳ     ﾃﾍﾍﾍﾍﾍﾍﾍ-ﾁ----------5---<   <---5--------------------ｽｳ   ｳ   ｺ
100mm                            >   >                      / ｳ   �   ｺ
  ｳ     ｳ                       <   <                     /   ｳ 4-�   ｺ-8
  ｳ                              >   >                   9\   ｳ   �   ｺ
  ｳ                             <   <                       \ ｳ   �   ｺ
  ｳ     ﾃ--------ﾂ----------5---->   >--5--------------------ｷｳ   ｳ   ｺ
  ｳ            / ｰ              <   <   ﾂ  ﾚﾄﾄﾄﾄ7ﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄ(ﾄ* ) ｺ
  ｳ     ｳ    14  ｰ10             >   > 33mmｳ              11-ﾌｹ   -   ｺ
  ｳ            \ ｰ              <   <   ｳ  ｳ<----50mm------->ｺﾈﾍﾍﾍｳﾍﾍﾍｼ
 ﾄﾄﾄ    ﾔ1ﾍﾍﾍﾍﾍﾍﾍﾏﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍ>   >ﾍﾍﾍﾍﾍﾏﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍﾍｼ    3
        ｳ-------------------450mm--------  13  --------------ｳ

1 Dog Food Cans. 2ｫ(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 & 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


Why Don't U send an interesting bul?

73 De John, G8MNY @ GB7CIP



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