Yet another... please add me to the list... I'm very interested. Thanks!
On 11/19/2012 2:04 PM, cdel...@juno.com wrote: > "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 -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.