[time-nuts] Low noise PLL for transceiver locking
francesco messineo
francesco.messineo at gmail.com
Tue Feb 2 18:23:59 UTC 2010
Hi Murray,
On 2/2/10, Murray Greenman <Murray.Greenman at rakon.com> wrote:
> Frank,
>
> My suggestion would be to try injection locking, rather than a PLL. No
> change is made to the 22MHz and 42MHz oscillators, except to find a way
> to inject enough reference power to force them to lock to it. Injection
> locking works well with modest harmonic relationships, and gives good
> noise performance. The injection can be via a coupling link, or even at
> the cold end of an existing bypass capacitor. Narrow pulses often work
> best.
>
> I am confident that you could lock 22MHz to a 2MHz injection (divided
> from your 10MHz reference) if the 2MHz pulse was narrow enough and the
> 22MHz oscillator sufficiently stable. 42MHz is more of a challenge - you
> might need a double-step, such as first locking 7MHz to 1MHz from the
> reference, and using that to lock 42MHz.
I confess I've never heard about injection locking! Do you have any
suggestion where
to start from to learn about it?
73
Frank IZ8DWF
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