[time-nuts] Setting Osc Frequencies
vk3yv at netspace.net.au
Wed Apr 11 02:49:08 EDT 2007
Hi Bruce, I for one would like to get the completed circuit seeing as I
started the whole thing off and was just getting ready to maybe do a copy of
the HP unit.
----- Original Message -----
From: "Dr Bruce Griffiths" <bruce.griffiths at xtra.co.nz>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Wednesday, April 11, 2007 4:34 PM
Subject: Re: [time-nuts] Setting Osc Frequencies
> Hal Murray wrote:
>>> And Hal- what about the pcb layout for Bruce's 74CX version? Had time
>>> to look at it yet?
>> It fell through the cracks when I got interested in something else.
>> Is anybody really interested in that board? If so, please send me a
>> reminder about the schematic.
>> There have been lots of ideas kicked around recently. Is that still the
>> right/best thing to build?
>> I've used PCB Express, http://www.pcbexpress.com/
>> $125 for 10 boards, 2 layers, no solder mask, up to 9 sq inches
>> $265 for solder mask and top silk screen.
>> add $45 for silk on the bottom side
>> Round up for shipping and taxes and whatever.
> For a simple no frills linear phase detector using an AD9901 (available
> from Digikey in the 44pin PLCC package)in the ECL mode is a better bet.
> It only requires a couple of slow linear amplifiers to scale the output.
> No comparators are necessary for the inputs.
> Just a few diodes capacitors and resistors are required to terminate the
> input cables and protect the differential clock inputs.
> If you want more bells and whistles such as programmable input dividers
> etc a CPLD implementation is better.
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