Re: Buzzer tuning question

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "J. B. Weazle McCreath by way of Terry Fritz <teslalist-at-qwest-dot-net>" <weazle-at-hurontel.on.ca>


At 08:21 PM 22/02/03 -0700, you wrote:
 >Original poster: "Ed Phillips by way of Terry Fritz <teslalist-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>
 >
 >Tesla list wrote:

 >I think I'm the one who posted that message; at least I posted a
 >similar one.  The high-Z meter might work, but you can't bring the
 >leads close enough to the top terminal of the TC or you'll detune
 >it badly.

<SNIP>

 >The buzzer method certainly will work, and a high-enough powered buzzer
 >would give useful sparks.  During WW1 there were some 100 watt "buzzer
 >transmitters" used which had a similar configuration.  Many signal
 >generators used the same circuit and I have a General Radio 174-B
 >wavemeter (circa 1922) which does the same thing.

<SNIP>

 >As for your VM, I'd try this idea with the small plate (you pick the
 >size).  The problem will be that if you're anywhere near a BC stations
 >you may pick up the voltage from it and not see the TC output.
 >
 >The experiment is easy, so give it a try.  Notice that the primary
 >capacitor and coil IN SERIES are connected across the interruptor
 >points of the buzzer.
 >
 >Ed
 >

Hi Ed, Coilers,

Thanks for the reply.  I may just have to break down and buy a cheap
'scope, but I will give the R.F. voltmeter a try once it warms up so
I can be out in my unheated shop again.  I have a textbook a friend
gave me published in 1915 titled "Handbook of Technical Instruction
for Wireless Telegraphists" which contains a chapter on the testing
of spark transmitter circuits with a buzzer.  As you mentioned, it
says to connect the buzzer points across the spark gap.

73, Weazle, VE3EAR/VE3WZL

"Don't take life so seriously, nobody has survived it yet!"

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