[time-nuts] Low phase noise VCO

Max Robinson max at maxsmusicplace.com
Wed Feb 10 19:37:21 UTC 2010


Bruce wrote.

>A full wave rectified sinewave has only even harmonics present.

True, but it needs a center tapped coil.

Regards.

Max.  K 4 O D S.

Email: max at maxsmusicplace.com

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----- Original Message ----- 
From: "Bruce Griffiths" <bruce.griffiths at xtra.co.nz>
To: "Discussion of precise time and frequency measurement" 
<time-nuts at febo.com>
Sent: Tuesday, February 09, 2010 7:25 PM
Subject: Re: [time-nuts] Low phase noise VCO


>A full wave rectified sinewave has only even harmonics present.
>
> Bruce
>
> 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.
>>
>> Regards.
>>
>> Max.  K 4 O D S.
>>
>> Email: max at maxsmusicplace.com
>>
>> Transistor site http://www.funwithtransistors.net
>> Vacuum tube site: http://www.funwithtubes.net
>> Music site: http://www.maxsmusicplace.com
>>
>> To subscribe to the fun with transistors group send an email to.
>> funwithtransistors-subscribe at yahoogroups.com
>>
>> To subscribe to the fun with tubes group send an email to,
>> funwithtubes-subscribe at yahoogroups.com
>>
>> ----- 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
>>>> the
>>>> PLL?
>>>>
>>>> Perhaps the noise is multiplied by 4, but would it work for the
>>>> intended
>>>> purpose?
>>>>
>>>> Bill Hawkins
>>>
>>> Can you do x4 multipliers? I thought odd-order harmonics were usually
>>> used for multipliers. I'd be happy to be wrong!
>>>
>>> Nick
>>>
>>> _________________________________________________________________
>
>
>
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