[time-nuts] LT1016 as a pulse shaper...

[ewkehren]

BruceWisjh I had known about it a week ago and we could have added a board to the A9 order. Next order is probably three weeks away ifIi can help contact me off list     Bert Kehren
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-------- Original message --------From: Bruce Griffiths <bruce.griffiths at xtra.co.nz> Date: 3/4/18  8:32 PM  (GMT-05:00) To: Hal Murray <hmurray at megapathdsl.net>, Discussion of precise time and frequency measurement <time-nuts at febo.com> Subject: Re: [time-nuts] LT1016 as a pulse shaper... 
Since I have a Timepod all that I'd need would be a board that had SMA inputs and outputs with provision for an LC L network to  step up the input if necessary plus an RLC network on the output something like in the attachment.

If one doesnt have a Timepod or equivalent a low noise phase detector will suffice for the noisier sources. An adjustable phase shift network is required to achieve quadrature between the LO (driven directly from the splitter) and the RF input (driven by the DUT output).

The required phase shift adjustment range could perhaps be reduced by using a quadrature hybrid to split the test source instead of a standard splitter. The output of the phase detector is low pass filtered and amplified and fed to a high resolution ADC such as a sound card.

Bruce

> 
>     On 05 March 2018 at 13:59 Hal Murray <hmurray at megapathdsl.net> wrote:
> 
>     Bruce Griffiths <bruce.griffiths at xtra.co.nz> said:
> 
>         > > 
> >         If I had a suitable PCB board for it I would do the measurement properly.
> > 
> >     > 
>     What would a suitable board look like and/or what sort of gear do you need to
>     measure PN?
> 
>     --
>     These are my opinions. I hate spam.
> 
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