[CW] TX Spark Simulator

[D.J.J. Ring, Jr.]

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




On Thu, Dec 19, 2013 at 6:51 PM, José Ricardo Ahumada
<jralu1kak at gmail.com>wrote:

> Hi All
>
> Does anybody on this site referred to a Java simulator run TX Spark a
> while back ago?
>
> I can´t  find it now ..
>
> 73
>
> José – LU1KAK
>
> ______________________________________________________________
> CW mailing list
> Home: http://mailman.qth.net/mailman/listinfo/cw
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:CW at mailman.qth.net
> CW List ARCHIVES: http://mailman.qth.net/pipermail/cw/
> Unsubcribe send email to cw-subscribe at mailman.qth.net
> Support this email list: http://www.qsl.net/donate.html
>
> =30=
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/cw/attachments/20131220/617d673e/attachment.html>