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

Pascual Arbona p.arbona at securimar.com
Tue Nov 20 12:41:10 UTC 2012


I am interested in one.


----- Original Message ----- 
From: <cdelect at juno.com>
To: <time-nuts at febo.com>
Sent: Monday, November 19, 2012 8:04 PM
Subject: [time-nuts] Nifty "MINI TIC" for DMTD work


>
> "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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