Re: Colpitts - Negitave resistance help

From: Winfield Hill (Winfield_member_at_newsguy.com)
Date: 06/26/04 

Date: 26 Jun 2004 11:43:54 -0700

ddwyer wrote...
>
> Jake writes
>> All I wanted to do was emulate this wide range they achieved in a signal
>> generator with a more conventional circuit with less switching. I don't
>> realy want to do anything with it. It has become a challenge and I saw a
>> possible solution in the negitive resistence calculation ;-) It is more
>> for knowledge and experience.
>
> Note that my comments re negative resistance/coulpitts/crystals still
> applies to an oscillator where the crystal is replaced by an LC circuit.
> A varicap tuned L can give a 2: 1 frequency sweep; within the active
> range of the coulpitts. For a wider range the L can be switched with pin
> diodes though for widest range I would use a zero phase shift series
> resonant oscillator with switched L

 Re: your Wireless World article, scanned and posted on a.b.s.e.,
 I was only able to retrieve the first page, would you be so kind
 as to separately repost the 2nd and 3rd pages?

 Thanks,
    - Win

 (email: use hill_at_rowland-dot-org for now)

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