Yes, I was thinking of trying a PICTIC II partial redesign with a Xilinx
CPLD, using other type of fast turn off diodes and so on.
On Tue, Feb 7, 2012 at 8:28 AM, Attila Kinali att...@kinali.ch wrote:
On Sun, 5 Feb 2012 19:55:36 -0900 (AKST)
Richard H McCorkle mccor...@ptialaska.net wrote:
att...@kinali.ch said:
BTW: does anyone know how these days low cost FPGAs perform in terms of
jitter? (the data sheets are kind of scarce in that regard). And how do they
compare to state of the art ECL logic?
Generally, not good.
The general problem is that they have a lot of logic and a
To enhance the PICTIC II performance can step recovery diodes be used?
Maybe the fast turn off can boost the switching capabilities of the
interpolator for best resolution...
On Tue, Feb 7, 2012 at 12:35 PM, Hal Murray hmur...@megapathdsl.net wrote:
att...@kinali.ch said:
BTW: does anyone
On Tue, 7 Feb 2012 08:28:14 +0100, Attila Kinali att...@kinali.ch
wrote:
On Sun, 5 Feb 2012 19:55:36 -0900 (AKST)
Richard H McCorkle mccor...@ptialaska.net wrote:
While using a faster timebase or higher interpolator gain increases
the resolution that doesn?t imply the accuracy will also
Step recovery diodes turn off fast but have a relatively long storage
time. The fastest switched current integrators use schottky diodes.
On Tue, 7 Feb 2012 14:06:55 +0100, Azelio Boriani
azelio.bori...@screen.it wrote:
To enhance the PICTIC II performance can step recovery diodes be used?
On Sun, 5 Feb 2012 19:55:36 -0900 (AKST)
Richard H McCorkle mccor...@ptialaska.net wrote:
While using a faster timebase or higher interpolator gain increases
the resolution that doesnt imply the accuracy will also increase. The
PICTIC II uses CMOS logic with propagation delays that vary
I know it has been a while since the boards were sent out, but I
finally placed an order with Mouser to populate the two boards I
bought. I already have the unobtainium chips and can program the
PICs, so no problems there.
The question is, how do I use the PICTIC II after I've assembled it? I
John,
I appreciate your help. Among other things, I'm not sure what to do
with the adjustment pots after I finish building the board.
Speaking of software, I was wondering if anyone had written a program
for controlling the PICTIC II and logging the data. Using a serial
terminal can be tedious.
John,
Would using the 50 MHz XO option be something I should consider?
Joe Gray
W5JG
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-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of Joseph Gray
Sent: Sunday, February 05, 2012 11:04 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] PICTIC II questions
John,
Would using
On Sun, Feb 5, 2012 at 12:12 PM, John Miles jmi...@pop.net wrote:
We were also talking about
some possible GUI ideas for configuration and data acquisition, but I was
ramping up a larger project at the time and never had time to explore them
further.
Before anything like a GUI, I think I'm
I appreciate your help. Among other things, I'm not sure what to do
with the adjustment pots after I finish building the board.
Set up to measure an interval that is more or less ramdon or granteed to
cover the full range of the interpters.
The idea is to adjust each pair the stop and start
I know the resolution can be enhanced by swapping out some parts, but it's
been too long to recall the details.
On the schematic is a list of alternate XOs. For 50 MHz, the 1000 pf
cap is changed to 180 pf. This is stated to give 25 ps maximum
resolution. If this simple change is all that is
Set up to measure an interval that is more or less ramdon or granteed
to cover the full range of the interpters.
The idea is to adjust each pair the stop and start sides to cover the full
range of possible of numbers without overlap or loss of resolution.
What source would I use to
Fellow Time Nuts,
The PICTIC II is a spin-off of a low cost front end developed for a
GPSDO to compare the oscillator to GPS 1PPS over very short ( 20us)
time intervals. In that application all that was required was 1ns
TIC resolution to match the resolution of the GPS sawtooth correction
to get
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