What about impedance matching?
Will a magic tee output with two gunn sources driving it will look anything
like a single source -as far as the power measuring device is concerned?
And similarly -impedance wise- what will the inputs to the magic tee look
like compared to the power measurig device being directly connected to each
of the sources? I suspect there will be source impedance changes- depending
on the sources being injection locked or not- as well.
But its been quite a while since I worked with this stuff.........
DaveB, NZ
----- Original Message -----
From: "Dr. David Kirkby (Kirkby Microwave Ltd)"
<drkir...@kirkbymicrowave.co.uk>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Sent: Thursday, October 09, 2014 9:46 AM
Subject: Re: [time-nuts] locking oscillators - an increase in power and/or
stability ?
On 8 Oct 2014 20:26, "Bob Camp" <kb...@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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