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On Sat, 19 Jul 2003 17:39:23 GMT, John Popelish
wrote: Paul Burridge wrote: Feed the square output to a coil+capacitor in parallel and you'll get a sine wave. Tune the this 'tank' circuit for harmonics of the funamental and you can double, triple, quadruple and so on the original square wave's frequency. This works pretty good at the third and fifth harmonics, but there is no second or fourth harmonic in a perfect square wave. Good point, John. But fortunately, I've never generated a *perfect* square wave! :-) In practice, it's probably more accurate to say that the even harmonics are well down on the odds. Blame it on dv/dt. |
On Sat, 19 Jul 2003 17:56:55 +0200, "Tom" wrote:
Paul Burridge wrote: Feed the square output to a coil+capacitor in parallel and you'll get a sine wave. Tune the this 'tank' circuit for harmonics of the funamental and you can double, triple, quadruple and so on the original square wave's frequency. Thank you Paul! This is a good hint. Can you tell me in which book did you learn it? I would really like to get into this stuff. Check out 'RF Circuit Design', by Chris Bowick. It's an excellent read on the subject of RF in general. |
Ken Knox wrote:
On Sat, 19 Jul 2003 06:47:32 -0700, W7TI wrote: On Sat, 19 Jul 2003 12:42:02 +0100, Paul Burridge wrote: 0 hz is hardly a 'frequency.' __________________________________________________ _______ Of course zero Hz is a frequency. Have you ever had a checkbook balance of zero? Is that not a balance? :-) Frequently!!! :-) I believe this proves that negative frequencies exist!! Rob |
Rob Judd wrote:
Ken Knox wrote: On Sat, 19 Jul 2003 06:47:32 -0700, W7TI wrote: On Sat, 19 Jul 2003 12:42:02 +0100, Paul Burridge wrote: 0 hz is hardly a 'frequency.' _______________________________________________ __________ Of course zero Hz is a frequency. Have you ever had a checkbook balance of zero? Is that not a balance? :-) Frequently!!! :-) I believe this proves that negative frequencies exist!! Rob Yes, it does. I just now sent you a message from the future on a negative frequency. You should be getting it yesterday. Hey, I should make a movie! Called "Frequency"! 73, Dave KZ1O -- Please yank that last "t" from my email address. It's "net", not "nett". You know how to do that, but the spammers won't. |
"W7TI" wrote in message ... On Mon, 21 Jul 2003 19:34:55 GMT, Dave Bushong wrote: I'm still stringing up my 0 MHz half-wave dipole. 468/f db kz1o __________________________________________________ _______ You will never finish. Sorry. :-) -- Bill, W7TI It could be shortened by the use of N turn loading coils, where N - infinity. -- ... Hank Hank: http://horedson.home.att.net W0RLI: http://w0rli.home.att.net |
Dave Bushong wrote:
I believe this proves that negative frequencies exist!! Yes, it does. I just now sent you a message from the future on a negative frequency. You should be getting it yesterday. Errm.... can i get a copy ? |
Old DXer wrote:
Yes, it does. I just now sent you a message from the future on a negative frequency. You should be getting it yesterday. Errm.... can i get a copy ? Careful -- you may end up in swaddling clothes and have to do it all over again. Kirk Over!! Picard - Make It So! Ok, see you on USS Eldridge. I can't wait to finally meet Tesla, Townsend Brown and Einstein. They must be somewhere on the ship! |
Tom wrote:
Old DXer wrote: Yes, it does. I just now sent you a message from the future on a negative frequency. You should be getting it yesterday. Errm.... can i get a copy ? Careful -- you may end up in swaddling clothes and have to do it all over again. Kirk Over!! Picard - Make It So! Ok, see you on USS Eldridge. I can't wait to finally meet Tesla, Townsend Brown and Einstein. They must be somewhere on the ship! Sure. They're down in the games room, watching the 3D television that Philo T. Farnsworth just invented. :) |
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