[time-nuts] How can I generate a very clean 1 W signal @ 116 MHz ?

Tim Shoppa tshoppa at gmail.com
Mon May 30 15:06:55 EDT 2016


OK, it sure sounds like you want to use a commercial signal generator or
something. But a different take:

14.5MHz is a standard stocked crystal at Mouser, Digikey, etc. Three stages
of doublers with simple fundamental-reject filters at each stage get you to
116 MHz.

If you want to make it time-nutty, there's the NIST JFET "push-push"
frequency doubler we've talked about here in the past. I think you'll use
substantially smaller number of turns on the 116MHz stage than on the
14.5MHz end of the transformers.
http://www.ko4bb.com/~bruce/FrequencyMultipliers.html

Tim N3QE

On Mon, May 30, 2016 at 7:06 AM, Dr. David Kirkby (Kirkby Microwave Ltd) <
drkirkby at kirkbymicrowave.co.uk> wrote:

> I was thinking about designing a 2 m (144-146 MHz) ->HF (28-30 MHz)
> transverter, using a 116 MHz local oscillator feeding a level 30 mixer.
>
> 116 + 28 = 144
> 116 + 30 = 146
>
> I'm wondering what's the best way to generate 116 MHz with very low phase
> noise. Phase noise at < 20 kHz offset is particularly important, but 200
> kHz would be fairly important. Outside that, it does not matter too much.
>
> The ability to lock to 10 MHz would be "nice", but certainly not essential,
> as absolute frequency stability would not be of prime importance. Getting
> the phase noise as low as possible would be more important. I expect better
> performance can be achieved if one forgets about locking the signal source
> to something else, but I may be wrong.
>
> An HP 8663A sig gen has <-147 dBc/Hz at 10 kHz offset, but I'd hope its
> possible to produce something better than is possible in a commercial sig
> gen that covers up to 2.5 GHz.
>
> Dave
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