Message 29788 in TECH.WW
From: G8MNY
Date: Fri, 11 Sep 26 07:09:00 Z
Newsgroups: TECH.WW
Subject: RF Field Indicator FL-30AH
Message-ID: <4779_GB7CIP>
Path: N2MH4|N3HYM|VE3CGR|LU9DCE|PY2BIL|GB7CIP
R:260911/0712Z 37031@N2MH4.#SENC.NC.USA.NOAM LinBPQ6.0.24
R:260911/0711Z 17677@N3HYM.#FRDK.MD.USA.NOAM BPQ6.0.25
R:260911/0711Z 94318@VE3CGR.#SCON.ON.CAN.NOAM LinBPQ6.0.25
R:260911/0711Z 21807@LU9DCE.TOR.BA.ARG.SOAM LinBPQ6.0.25
R:260911/0711Z 54140@PY2BIL.SP.BRA.SOAM LinBPQ6.0.25
R:260911/0709Z @:GB7CIP.#32.GBR.EURO #:4779 [Caterham Surrey GBR] $:4779_GB7CIP
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..
INSIDE LAYOUT _
CIRCUIT SW
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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