[time-nuts] locking oscillators - an increase in power and/or stability ?

Bob Camp kb8tq at n1k.org
Wed Oct 8 18:22:23 EDT 2014


In the case of a magic Tee or a normal power splitter (both passive devices), the current will not be limited by the combiner or the source. With a proper combiner, the source will always be running into 50 ohms. You will indeed get 6 db in the in phase sum case. 


On Oct 8, 2014, at 4:46 PM, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby at kirkbymicrowave.co.uk> wrote:

> On 8 Oct 2014 20:26, "Bob Camp" <kb8tq at n1k.org> wrote:
>> Hi
>> It’s called injection locking. The two oscillators (or what ever) lock up
> at exactly the same frequency and some arbitrary phase. Depending on the
> amplitude and phase at the sum point, the result can be anything from +6 db
> to zero power. Anything that oscillates can injection lock if given the
> right feedback at the right point.
>> The gotcha is that they are at the same frequency, so they add as
> voltages rather than power. In phase, equal amplitude, you get 6 db more
> power. Exactly 180 degrees out of phase and exactly equal power and you get
> nothing (no power at all) at the sum point. Off by a fraction of a degree
> or a fraction of a db and you still get roughly 6 db in the zero degree
> case.
> But while voltages could double,  that is not going to happen if something
> limits the current.
>> Bob
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