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

paul swed paulswedb at gmail.com
Wed Oct 8 15:11:52 EDT 2014


David the locking makes sense but the other numbers do not make sense.
Combined best case would be +3 DBm also you say the current on the diodes
goes down. More power for less power in is not adding up.
Though the right question is what are they using as power detectors?
When the 2 are combined there could be a large lower frequency mix product.
Broad band detectors just collect all of the stuff and add it up.
Regards
Paul
WB8TSL

On Wed, Oct 8, 2014 at 1:10 PM, Dr. David Kirkby (Kirkby Microwave Ltd) <
drkirkby at kirkbymicrowave.co.uk> wrote:

> There's a discussion on the "ukmicrowave" list about combining the
> power from two 10 GHz Gunn oscillators with a magic T.  One might
> expect to get nearly double the power if the two oscillators are
> combined. What people are observing is getting more than double the
> power. To quote from
>
> http://www.bobatkins.com/radio/10GHz_gunn_power_combiner.html
>
> "Individually, the two oscillators produced 64 and 70 mW,
> respectively, but produced a combined power output of 235 mW. "
>
> Another one
>
> "The stability of the combined oscillators was found to be higher than
> that of the individual oscillators. "
>
> It is hardly surprising the two lock together in frequency.
>
> I wonder if people see similar things with pendulums in clocks? I
> can't think of any logical explanation for this, but it seems to be
> more than an April fools joke.
>
> What is interesting is someone who just tried it says the current in
> the diodes goes down about a mA when combined, so the input power to
> the devices go down very slightly. Typically these things run at a few
> hundred mA, so 1 mA is likely to be less than 1 %.
>
>
>
> Dr. David Kirkby Ph.D CEng MIET
> Kirkby Microwave Ltd
> Registered office: Stokes Hall Lodge, Burnham Rd, Althorne, Essex, CM3
> 6DT, UK.
> Registered in England and Wales, company number 08914892.
> http://www.kirkbymicrowave.co.uk/
> Tel: 07910 441670 / +44 7910 441670 (0900 to 2100 GMT only please)
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