[time-nuts] Low phase noise VCO
bruce.griffiths at xtra.co.nz
Tue Feb 9 20:32:34 EST 2010
Thats not very useful when you want the 4th harmonic as its amplitude is
zero fro a 25% duty cycle.
Using a duty cycle of 1/8, 3/8 or 5/8 will maximise the amplitude of the
Max Robinson wrote:
> If you start with a square wave odd order is all you can get but if
> you start with a pulse with a 25% duty cycle you can get even order.
> It's best to optimize the pulse width for the harmonic you want.
> Max. K 4 O D S.
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> ----- Original Message ----- From: "Nick Foster" <bistromat at hotmail.com>
> To: <time-nuts at febo.com>
> Sent: Tuesday, February 09, 2010 6:35 PM
> Subject: Re: [time-nuts] Low phase noise VCO
>>> From: bill at iaxs.net
>>> To: time-nuts at febo.com
>>> Date: Tue, 9 Feb 2010 18:24:39 -0600
>>> Subject: Re: [time-nuts] Low phase noise VCO
>>> Which leads me to ask a novice question:
>>> Why not pull a 16 MHz crystal and multiply to 64 MHz?
>>> If you count down from 64 to 10 MHz, isn't the multiplication inside
>>> Perhaps the noise is multiplied by 4, but would it work for the
>>> Bill Hawkins
>> Can you do x4 multipliers? I thought odd-order harmonics were usually
>> used for multipliers. I'd be happy to be wrong!
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