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kb8wfh (November 30, 1999 at 12:00 am)
I have a vague recollection of hearing about some early experiments using a rotary gap to modulate a phone signal, but I don't think they were at all practical or usable. However, it was ultimately unnecessary as AM signals were possible with carrier signals with newly emerging vacuum tubes. I really wouldn't bother to try it with a rotary gap to generate a signal. I doubt whatever you got would really be intelligible.
Rippey574 (November 30, 1999 at 12:00 am)
I am attempting to do an spark gap transmitter. what i am trying to do is actually output modulated sound like with a modern unit (am C.B. {U.S.A.} style) with the spark gap. Is this possible or is spark gap limited to CW operation only?
NorbertZF (November 30, 1999 at 12:00 am)
Excellent! Wish I had one. I also have an interest in the wireless transmission of energy as per Tesla.
Thank you!!!
WA5MUF (November 30, 1999 at 12:00 am)
I bet not too many RSTs with a T of 9 were received back in the Spark Gap days! Great video -- thanks a million.
73,
WA5MUF (Same call sign since 1965)
trisoctehedron (November 30, 1999 at 12:00 am)
I am sure glad I got to see a spark transmitter at last after reading about them for so long. I've never understood why they need a rotary gap. Looks like you could just key a stationary gap with high voltage applied to it and get a spark. If you feel like explaining I will be very grateful.
kuernodechivo (November 30, 1999 at 12:00 am)
I think I heard someone running voice into one of those on 27.025 (The Bowl)
RckyMtneer (November 30, 1999 at 12:00 am)
Thanks for posting that. One of my grandfathers, u6CCY, had one of those in the 1920's. I still have his original licenses that state he was authorized to run spark gap. Kewl! Rick N0VLF Colorado
Mindraker1 (November 30, 1999 at 12:00 am)
Good heavens, mate. You can hear that thing humming.
Organgrinder010 (November 30, 1999 at 12:00 am)
Beauty. You do fine work.
gedanate (November 30, 1999 at 12:00 am)
Wow! So now I really understand why early ships' radio operators were all called "Sparks". Thank you very much. I've got to show this video to my XYL, but she already believes all Hams are crazy. :-)
73 de David, vk2dmh |
