[time-nuts] Nifty "MINI TIC" for DMTD work

[Daniel Mendes]

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Daniel

Em 19/11/2012 17:57, Volker Esper escreveu:
>
> I'd like to be on the list. Definitely. Where do I have to pay?
>
> Volker
>
>
> Am 19.11.2012 20:04, schrieb cdelect at juno.com:
>>
>> "MINI-TIC" for DMTD work
>>
>>
>> Hi Everyone!
>>
>> I've been testing a Miniature 2 channel TIC that Bert Kehren and Juerg
>> Koegel
>> and Richard Mc Corkle have designed.
>>
>> It has 9 digits/Sec. and with a 1HZ offset in the DMTD unit gives a
>> resolution of 1X10-15th  at 10 MHz, 2X10-15 with a 5 MHz input, when
>> measuring
>> Allan deviation. The 200 MHz version doubles the resolution.
>>
>> Of course the baseline performance of the DMTD unit and the stability of
>> the DMTD reference determines the actual accuracy you can obtain.
>>
>> (My dual mixer has a baseline of approx. 8X10-14th at 1 second and my
>> best reference is  4X10-13th at 1 second.)
>>
>> The "MINI" takes a 5 or 10 MHz reference that only has to be stable to
>> parts in 10-8th/sec.
>> I used a neat 14PIN ovenized DIP clock chip I got on eBay and recently
>> discussed on the list.
>>
>> The reference is multiplied to 100Mhz for use as the counters clock.
>>
>> The "MINI" is about 2.5 by 2 inches and has only 5 chips. Two opto
>> couplers an
>> op amp for two analog channels are also on the board. If run on 5 volt a
>> 3.3 V
>> regulator is also on the board. Power required is +5VDC 0.05 A and +- 12
>>
>> (for the RS232 interface)
>>
>> It also has two pins you can individually ground to measure the 
>> period of
>> the beat
>> note from either channel.
>>
>> This allows you to adjust the offset frequency quickly and accurately.
>>
>> I installed the "MINI" into a 1U chassis with the power supply and also
>> added "heartbeat" LEDS for each channel to show the presence of the 1PPS
>> inputs.
>>
>> I have plotted several Rubidium and many Quartz using the "MINI"
>> simultaneously with a SR620 counter/timer. The plots are "identical"! So
>> much
>> so that I am going to "retire" and sell my SR620!
>>
>> I understand work is complete on a 4 channel counters and Bluetooth
>> interface,
>> and work is ongoing on a LCD.
>>
>> The "MINI" material cost is less than $25.00 depending on how many
>> boards are ordered!
>>
>> Resoution based on clock frequency and beat frequency:
>>
>> Carrier[MHz]  Beat [Hz]     Heterodyne    TIC [ns]   Resolution
>> 10101.00E+06101.00E-14
>> 1011.00E+07101.00E-15
>> 1011.00E+0755.00E-16
>> 10101.00E+0655.00E-15
>> 5105.00E+05102.00E-14
>> 515.00E+06102.00E-15
>> 515.00E+0651.00E-15
>> 5105.00E+0551.00E-14
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