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G8MNY  > TECH     10.05.22 11:37z 50 Lines 2217 Bytes #23 (0) @ WW
BID : 1924_GB7CIP
Read: GUEST
Subj: 2m Cavity Filter
Path: SP7YDD<SR8BBS<SR4BBX<DB0RES<DB0ERF<DK0WUE<DB0ZAV<UA6ADV<VE2PKT<VE3KPG<
      GB7CIP
Sent: 220510/0704Z @:GB7CIP.#32.GBR.EURO #:1924 [Caterham Surrey GBR] $:1924_GB
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!

           ߲__12                        13
     ۲1<   <ͻ
    12___/                    >   >    <-----50mm------>ͻ
         6    10            <   <  33mm              11-̹  3_   
        2               >   >    7(* ) 
       -----------5---<   <---5--------------------      
100mm                            >   >                      /       
                              <   <                     /    4-   -8
                                >   >                   9\         
                               <   <                       \       
       ------------------5---->   >--5--------------------      
              /               <   <     7(* ) 
           14  10             >   > 33mm              11-̹   -   
              \               <   <     <----50mm------->ͳͼ
     1>   >ͼ    3
        -------------------450mm--------  13  --------------

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 & 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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