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Old 20th Feb 2018, 3:34 pm   #8
David Simpson
Octode
 
Join Date: Mar 2008
Location: Aberdeen, UK.
Posts: 1,556
Default Re: Tottenham Wireless Society

Right enough Richard, I had forgotten to mention that the coils were Gambrell's.
Reason for slurping sherry yesterday evening - managed, at last, to get the 90 odd year old buzzer mechanism sorted & working. Drew 80 - 100mA between 4 & 6V DC, and 110 to 120mA at 9V.
Briefly checked the resonance of the tank circuit using the 'A' Coil, and my wee h/held counter revealed "approx." frequencies between 800KHz & 1.2MHz. But its hit & miss, as folk ken - the buzzer's wee spark-gap will give an infinite bandwidth of EM radiation, and the LC tuning circuitry is rather basic. So the wee counter just couldn't lock-on to a specific steady frequency.
It might well be that the enterprising Experimental Wireless Magazine perhaps became agents for a specific wavemeter manufacturer. This set is too well made for a 1920's homebrew project. Shall delve further.

Regards, David
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