[time-nuts] 10 MHz -> 16 MHz

[Tom Holmes]

Hi Pete...
TAPR doesn't really discontinue things until we've sold out the quantity we've built. Sometimes that is 100pieces, sometimes 500. It all depends on how many we think we can sell when the kit comes out. If we sell out and still see a lot of interest, we may do a second build. The Clock-Block has been around for a few years and took a couple of years to sell out. 

From Tom Holmes, N8ZM

> On Oct 9, 2018, at 1:25 PM, Pete Lancashire <pete at petelancashire.com> wrote:
> 
> I just wish the tapr would not discontinue things so fast it seems once you
> see it mentioned it's discontinued
> 
>> On Sun, Sep 30, 2018, 1:08 PM Bob kb8tq <kb8tq at n1k.org> wrote:
>> 
>> Hi
>> 
>> If (as originally specified) noise and jitter are not a big deal - there
>> are a lot
>> of chips out there like the ICS570. They are designed to do weird ratio
>> frequency
>> conversions so 10 to 12 or 10 to 16 are trivial for them. The Clockblock
>> board was
>> one way to get it all put together.
>> 
>> Bob
>> 
>>> On Sep 30, 2018, at 12:05 PM, Gerhard Hoffmann <dk4xp at arcor.de> wrote:
>>> 
>>> 
>>>> Am 30.09.2018 um 16:49 schrieb Attila Kinali:
>>>> 
>>>> The simplest way I can think of is the following:
>>>> Use a 74LV8154 to divide the 10MHz down to 152.587890625Hz.
>>>> Use the capture timer unit of the uC to measure the phase of the
>>>> pulse. Use any kind of DAC (internal, external, PWM,...) to steer
>>>> the 16MHz VCO. Depending on how fast the timer unit runs, this
>>>> will give you something in the order of 10-200ns dead-band.
>>>> By choosing the right frequency for the timer unit, one can
>>>> get it to "dither" a bit and then use averaging.
>>>> 
>>>> For lower jitter, use one half of a Nutt interpolator
>>>> to get the timing difference between the 152Hz signal
>>>> and the 16MHz (ie similar to what the SRS FS740 does).
>>>> Use something akin Nick Sayer's time-to-amplitude converter
>>>> for the fine measurement.
>>>> 
>>>> Same works equally well for 12MHz.
>>>> 
>>>> 
>>> 
>>> Wow. That's truly a Rube Goldberg design.
>>> 
>>> There is a simpler way.  IDT ICS570. Digikey 800-1073-5-ND
>>> 
>>> Solder time less than 10 minutes.
>>> I had the 3V3-Version in the parts drawers, officially it takes the 5V
>>> version to generate the 160 MHz, but the 3V3 version happened to work,
>> too.
>>> The difference between 120 and 160 MHz is just a GND wire on pin 6 (vs.
>> open)
>>> 
>>> Divide by 10 is left as an exercise.
>>> 
>>> regards,
>>> Gerhard
>>> 
>>> (But then, some like to build and tune multiplier chains and mixers.)
>>> 
>>> 
>> <Auswahl_008.png><times12.bmp><times16.bmp>_______________________________________________
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