[CW] TX Spark Simulator

[José Ricardo Ahumada]

Hi All

Thanks David N1EA, very good presentation of the operation of Spark, worked perfectly, missing only hear the Generators. Also interesting is the history of Broadcast Stations..not know her. You always surprise David.

73 José – LU1KAK

 

 

De: cw-bounces at mailman.qth.net [mailto:cw-bounces at mailman.qth.net] En nombre de D.J.J. Ring, Jr.
Enviado el: viernes, 20 de diciembre de 2013 02:27 a.m.
Para: CW Reflector
Asunto: Re: [CW] TX Spark Simulator

 

LU1KAK de N1EA = R R R 

 

Sure thing José,

 

If anyone wants to operate and experience a  spark gap transmitter, there is virtual machine at:  http://www.zianet.com/sparks/transmitters.html#virtual

 

Requires JAVA version 7.45 to operate. If you don’t have it, the browser displays an empty rectangle below the title

 

“A Virtual Spark Transmitter”. With your mouse button , you need to energize the  transmitter before it will transmit.

 

Notice that you have to take the HF coil out - that coil let you transmit on 300 meters - or just around 1000 kc/s (kHz).  It was illegal to use that frequency less than around 200 miles from shore - EXCEPT of course if there was an SOS.

 

Broadcast stations - the 540 to 1600 kc/s medium wave band had to have a licensed radiotelegraph operator - commercial license - on duty at the remote control point - the broadcast studios and master control building - he had a receiver tuned to 500 kc/s and had to make a log entry at 15 to 18 minutes past the hour and 45 to 48 minutes past the hour.  He ALSO had to immediately shut the station down if he heard an SOS.

 

Usually an announcer would come on and say "This is WNBC, New York, we are now going off the air do to a ship SOS and will return as soon as the distress is over, this is WNBC, New York signing off the air....." and the carrier would go dead.

 

I knew people who did that and my aunts remember hearing it.

 

Have fun.

 

73

 

David N1EA

 

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