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.

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

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

On 20 Jul 2003 23:28:34 GMT, (Avery Fineman)
wrote:

In article , Paul Burridge
writes:

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.

Hmmm...I'd "blame" M. Fourier for any of that, not the "dv/dt."

Sorry. The reference to the dv/dt was supposed to appear directly
after the quip about the "perfect square wave" - rather than blaming
Fourier, perhaps my text editing should be held culpable. :-)
Anyway, Len, by all means send me a copy of your program. All these
little utilities will doubtless prove their value at some future time.
Thanks.

On 20 Jul 2003 23:28:34 GMT, (Avery Fineman)
wrote:

In article , Paul Burridge
writes:

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.

Hmmm...I'd "blame" M. Fourier for any of that, not the "dv/dt."

Sorry. The reference to the dv/dt was supposed to appear directly
after the quip about the "perfect square wave" - rather than blaming
Fourier, perhaps my text editing should be held culpable. :-)
Anyway, Len, by all means send me a copy of your program. All these
little utilities will doubtless prove their value at some future time.
Thanks.

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.

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