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 t
Just came across another FE-5680A tear down video, this one is gets right down
into the RF cavity and lamp assembly.
While I was watching the video, I was thinking you could fix that.. ohh.. too
late.. Unfortunately for this Rb, it gets ultimately destroyed!
Didn't someone need a dead 5680 to d
Why is 10MHz output of many sources or distribution amps in the form of
a sinewave?
Is it something to do with signal reflections or ease of isolation?
Since zero crossing detectors are susceptible to noise wouldn't a fast
TTL square
wave be more appropriate for signal distribution within a equip
(Sorry for the dupe, not sure how that happened...)
-- john
> -Original Message-
> From: time-nuts-boun...@febo.com [mailto:time-nuts-
> boun...@febo.com] On Behalf Of John Miles
> Sent: Sunday, February 05, 2012 1:46 PM
> To: 'Discussion of precise time and frequency measurement'
> Subje
Hi
I suspect it's a linear compensation of a temperature effect that's actually
higher order. Depending on exactly where you are it could be a good thing or a
very bad thing. I have seen examples of both …
Bob
On Feb 5, 2012, at 9:02 AM, Magnus Danielson wrote:
> On 02/02/2012 06:15 AM, Scott
> 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 accomp
> 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 r
El 05/02/2012 22:27, John Miles escribió:
John
Thank you for your effort. It would be nice if you could confirm the 4 to
5
Hz dither that seems to be the loop time constant and long term aging
that
will influence the GPS/Rb control loop time constant setting. I did see 1
E-12 per month wh
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 side
On Sun, Feb 5, 2012 at 12:12 PM, John Miles 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 going to wr
Thanks for the info, Clint.
Seems like the only way to get my four Panasonic DVRs to synchronize
time is to analyze the I/O of the micro in the DVR, write interface
and HMI specs, and replace the micro with one that can talk to my
SNTP server. (Added two DVRs back when NASA was launching shuttles.
> -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
John,
Would using the 50 MHz XO option be something I should consider?
Joe Gray
W5JG
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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.
> 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 assemb
And then all that can be done is lock the oscillator to a solution derived
from the birds... this can explain why a receiver can fail to correctly
lock an oscillator or give a strange PPS. That is, it is possible, in case
of errors, to have, for example, a PPS displaced by 1mS but state that the
s
On 02/02/2012 06:15 AM, Scott Newell wrote:
Javier Herrero's exciting DDS discovery led to this plot of the unit
tweaking the frequency (cmd 0x22):
http://n5tnl.com/time/fe-5680a/graphs/dds_autotuning.png
It appears to make an adjustment even before lock!
It is interesting how the DDS freque
On 02/03/2012 05:30 AM, Jim Lux wrote:
On 2/2/12 12:05 PM, Daniel Schultz wrote:
I found this homebrew GPS receiver project recently:
http://www.holmea.demon.co.uk/GPS/Main.htm
No custom specialized chips that are unavailable in small quantities,
or which
will go obsolete in a few months. I th
On 02/02/2012 10:13 AM, Azelio Boriani wrote:
OK, got it: no need to lock the receiver clock to birds to get stable data
(e.g. Oncore+Cs) but the clock can be locked to birds to get even better
data and obtain "for free" a reference clock (TBolt). The use of a stable
clock (not locked to birds) f
Several months ago I said that if I received scans of the pages that
are missing from the Fluke 845A/AB manual that is posted to the Fluke
web site (and other places), I would assemble a complete manual and
upload it to Didier's site. Through the generosity of another list
member, I received a
John, there are several different versions of the pico supply, if you look
at the M2, M3, or M4-ATX, they are designed to run in a (12v) vehicle and
will work from 6v to 24v. Take a look at:-
http://www.short-circuit.com/categories/dcdc.html
about half-way down the page.
On Sat, 04 Feb 2012 14
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
ha
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