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

DARRELL ROBINSON darrell at shaw.ca
Tue Nov 20 04:41:51 UTC 2012


Please put a tic next to my name. I am interested as well and await details.

Darrell

----- Original Message -----
From: cdelect at juno.com
To: time-nuts at febo.com
Sent: Monday, November 19, 2012 11:04:12 AM
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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