I'd like to be on the list. Definitely. Where do I have to pay?
Volker Am 19.11.2012 20:04, schrieb [email protected]:
"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 ____________________________________________________________ Woman is 53 But Looks 25 Mom reveals 1 simple wrinkle trick that has angered doctors... http://thirdpartyoffers.juno.com/TGL3141/50aa82cb1214a2ca03f8st04duc _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
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