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G8MNY  > TECH     25.04.24 16:32l 73 Lines 2747 Bytes #6 (0) @ WW
BID : 6247_GB7CIP
Subj: RF Field Indicator FL-30AH
Path: JH4XSY<N3HYM<K5DAT<VE3CGR<VK2RZ<GB7CIP
Sent: 240425/0732Z @:GB7CIP.#32.GBR.EURO #:6247 [Caterham Surrey GBR] $:6247_GB
From: G8MNY@GB7CIP.#32.GBR.EURO
To  : TECH@WW

By G8MNY                                                (New Mar 09)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)

This device is used to peaking up or "seeing RF" around your Tx aerial.
Here is a reverse engineered diagram this simple RF indicator..
            ｳ
            ｳTelescopic
            ｺ Plug in
            ｺ Aerial
           ﾚﾐｿ
ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾁﾄﾁﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ｳ  ________    __.__   ｳ   
ｳ ｳ|       ｳ  / Tune\  ｳ  It covers 1MHz to 300MHz in 5 Bands
ｳ ｳ|       ｳ |   _   | ｳ  with a set of 180� scales.
ｳ  ~~~~~~~~ |---(_)---|ｳ 
ｳ            |  Dial | ｳ
ｳBand  Phone  \__ __/  ｳ
ｳ (_)    o       ~     ｳ
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ

INSIDE LAYOUT     _
ﾚﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾅﾄﾅﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
ｳ                 ~         Meter       ｳ
ｳ                      ｳ~~~~~~~~~~~~~~ｳ ｳ
ｳ                      ｳ        L1    ｳ ｳ
ｳ    ﾚﾄﾄﾄﾄﾄﾄｿ          ｳ    L2        ｳ ｳ
ｳ    ｳ 100pFｳ          ｳ______________ｳ ｳ
ｳ    ｳ   �  ｳ             L3   _-_      ｳ
ｳ    ｳTuningｳ                /~   ~\    ｳ
ｳ    ﾀﾄﾄﾄﾄﾄﾄﾙ               |       |   ｳ
ｳ               L4         |    o    |SWｳ
ｳ                           |       |   ｳ
ｳ                    (0) L5  \_   _/    ｳ
ｳ                              -_-      ｳ
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾙ

CIRCUIT              SW
                      oﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ
              \ｳ/     oﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ     ｳ
Phones         ｳ      oﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄﾄｿ     ｳ     ｳ
 ==>ﾄﾄﾄﾄﾄﾄﾄﾂｴ<ﾃﾁﾂﾄﾄﾄﾄ>oﾄﾄﾄﾄﾄﾄﾄｿ     ｳ     ｳ     ｳ
 _ｳ_^ﾄﾄｿn47ｳ    ｳ_    oﾄｿ     ｳ     ｳ     ｳ     ｳ
       ｳ  ===   ｳ/|     ｳ     ｳ     ｳ     ｳ     ｳ
       ｳ  _ｳ_  ===      ｳ     ｳ     ｳ     ｳ     ｳ
   ﾚﾄﾄﾄｴ       /ｳ100pF Aｳ    Bｳ    Cｳ    Dｳ    Eｳ
10nｳ   ｳ       _ｳ_    L1)   L2)   L3)   L4)   L5)Short
  === Meter             )     )     )     )     ｳWire
   ｳ  560R              )     )     )     ｳ     ｳ
   ﾃﾄﾄﾄﾙ                ﾀﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄﾁﾄﾄﾄﾄﾄｴ
  _ｳ_                                          _ｳ_  
                       1-3   3-9  7-20  25-80 90-300MHz

HOW IT WORKS
The input from the telescopic probe feeds RF into the high impedance tuned
circuit with the poly variable capacitor. The 5 pole switch selects the coil
for the chosen band. All coils are fixed type to the tuned frequency scale is
only apporximate. The diode detector drives either headphones or the meter.
Sensitivity is adjusted by the length of the telescopic aerial.
                                      
It is not very good at selecting RF so it is not really a wavemeter!


Also look at my TECH buls on "Piston Absorption Wavemeter", "BURNS's MF-UHF
Wavemeter TC-101", & "AKD's VHF/UHF Wavemeter WA1".


Why Don't U send an interesting bul?

73 de John G8MNY @ GB7CIP


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