The link seems garbled for some reason with it inline so let me try again.
http://www.evoria.net/AE6RV/TIC/TIC2.bmp >________________________________ > From: Bob Stewart <b...@evoria.net> >To: Discussion of precise time and frequency measurement <time-nuts@febo.com> >Sent: Sunday, March 9, 2014 10:40 AM >Subject: Re: [time-nuts] New TIC test run > > >Hi Anders, > >I just put the schematic up at http://www.evoria.net/AE6RV/TIC/TIC2.bmp >However, there are some caveats: I did not have to use the level shifter >Q1/Q2. I am not yet using VR1. (Actually the one I bought failed for some >reason.) R4 is actually 2.4K, and C1 is not being used. The capacitors in >the 18F2220 PIC are sufficient without C1. > >I'm not sure what you mean by "what is the range". The ADC is 10 bits wide. >The output varies from about 150 to about 500 units over 360 degrees of phase >error without the Voltage Ref. It should be twice that when I get that in and >working; though I am worried that it might clip on the high side so... > >The red data, as it says on the plot, is the 53345B. The blue data is from >the TIC. The transfer function is nonlinear, and I have made no effort to >correct for this. > >I've had a day to play with it, and I'm amazed at the precision of this thing. > It's like taking the 5334B and adjusting the focus knob. Of course it's not >as accurate, due to the way it works, but it will fit my needs well in my >GPSDO. > >Bob - AE6RV > > > >>________________________________ >> From: Anders Wallin <anders.e.e.wal...@gmail.com> >>To: Bob Stewart <b...@evoria.net>; Discussion of precise time and frequency >>measurement <time-nuts@febo.com> >>Sent: Sunday, March 9, 2014 3:19 AM >>Subject: Re: [time-nuts] New TIC test run >> >> >> >> >>Do you have the schematic for this online somewhere? >>what is the range of the interpolator? >>which TIC is the red/blue points? the blue data looks like it is aliased >>somehow, perhaps a number that is truncated/rounded badly? >> >> >> >> >>On Sat, Mar 8, 2014 at 9:46 PM, Bob Stewart <b...@evoria.net> wrote: >> >>I put my TIC to hardware, and have started testing it. Here is a sample run >>comparing it against the 5334B with an off frequency OCXO. I've scaled and >>rotated to tried to cancel out the length of the cables to the 5334B. Still >>early days with it, yet. >>> >>> >>>http://www.evoria.net/AE6RV/TIC/TICvs5334B.png >>> >>>Bob - AE6RV >>>_______________________________________________ >>>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. > > > _______________________________________________ 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.
