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LF: Info selective voltmeter WG TFH-2

To: [email protected]
Subject: LF: Info selective voltmeter WG TFH-2
From: "'Geri' Kinzel, DK8KW" <[email protected]>
Date: Sat, 15 Apr 2000 13:52:02 -0400
Reply-to: [email protected]
Sender: <[email protected]>
Hello Renato,

Hi!
I have a selective voltmeter Wandel & Goltermann TFH-2.
I tried to listen our  136 khz qso but I was not able to listen (i have a
multiturn loop homemade, 1 m. diameter, tuned via a variable capacitor. The
signal >is amplified by a cascode bi-Fet)
I think my selective voltmeter is too little sensitive (it is able to
measure  -40 to + 40 dB).
I think it is possible to modify it!
Have you modified it?
Can you help me?
or must I  put it in in the garbage :-((((  ?
Thanks and best regards
Renato IK2WYS

you are right, - 40 dB, is not sensitive enough (if it is -40 dBm, this is
equivalent to about 2 mV sensitivity, what you need would be at least about
-110 dBm. You might be able to increase the sensitivity with a
pre-amplifier.

However, don't through it away, those selective voltmeter do an excellent
job to measure the near-field of a transmitting station, and for that
purpose the sensitivity should be ok! Anyhow, don't through it away,
whatever you do ... those old instruments have a lot of components that
might be usable for LF applications ...

Vy 73

Geri, DK8KW (W1KW)


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