2) Does any one have the test data of 12 digit/s counter when DUT=REF?
I want to know the gap between mine and a commercial counter.
Thanks
Li Ang
I did a lot of testing of 53132A counters a while back to research how well the
interpolators worked and to measure the interference when
On 2/27/15 3:23 AM, Flemming Larsen wrote:
Check the price here:
Patek Philippe Digital Display Clock
| |
| | | | | | | |
| Patek Philippe Digital Display ClockVintage digital display clock by Patek
Philippe of Geneva. Made for Abou Watfa of Damascus, circa 1970. Rare Patek
I have an XL-DC and it has an internal GPS receiver in it. It supplies
and monitors 5 volts to a BNC antenna jack for an external amplified GPS
antenna. I don't know what the internal GPS engine is but doubt if it is
anything special.
The manual describes the down converter system as
Hi all,
I was wondering if anyone has ever had any success with the TS2100 and
getting the ACTS system to work correctly and adjust the clock. As most
of you know there is a bug in the 4.1 firmware version that was putting
everything off a second with GPS. So my company purchased another one
Hi
All of these older rack mount “GPSDO” products had a fairly long lifespan
compared
to the advances in GPS receivers. When some / most of them first came out, the
only practical /proven
way to do timing off GPS was with a downconverter. Without things like serial
numbers / date codes it’s
I can confirm there are at least two common varieties of the XL-DC GPS
RX board.
One uses a normal GPS antenna (no down-converter, provides DC on the
antenna line for an amp in the antenna, the typical antenna provided
seems to be an AeroAntenna AT575 variety, but I suspect other antennas
Hello, all. I have a reel of the good Rev C DS1620S chips as used in
the T-bolt. $1 each + shipping. Pic of the chip is at the link below.
Please contact me off list if interested. Not sure if anybody needs them
anymore, and wanted to check with the list before I get rid of them.
Thanks.
Hi
One important caution on antennas:
The 575 is quite happy with anything from 5 to 18V as a feed voltage and only
pulls 35 ma. There are antennas out there that don’t like voltages over 6V.
There also are antennas on the market that pull well over 50 ma.
If the “original” box sourced 12V
If we all did this, then I realize that we could identify the different
power grids. However, I wonder if there is any interesting variation
*within* a grid. As the electricity flows vary throughout the day, it
seems possible that the phase difference between two people on the same
grid
Hi Tim,
probably not the answer you are looking for, because it's a piece of
software and not a device, and it doesn't output NMEA, but maybe it can
still be of some help
https://github.com/mpbraendli/trimble-thunderbold
Matthias
HB9EGM
On 26. 02. 15 05:11, Tim wrote:
Hi all,
Is there a
In my XL-DC's case, there must have been a downconverter built into the antenna
(which I don't have), but there was an upconverter in the chassis which took
the IF signal from the cable, and heterodyned it back up to L-Band. I haven't
fiddled-around with the upconverter, but I suspect the IF
HI
On Feb 27, 2015, at 10:46 AM, Philip Gladstone
pjsg-timen...@nospam.gladstonefamily.net wrote:
On 2/26/15 20:39, Charles Steinmetz wrote:
ben wrote:
I'm going to have to build one of these. Assume you have some sort of
circuit that converts low-voltage AC from a transformer secondary
I don't think your TTi TF930 has a GPS input to calibrate against, based on
a quick perusal of the data sheet. I would guess that the calibration
constants are thus fixed from the factory (including temperature
coefficients).
On Thu, Feb 26, 2015 at 3:36 PM, James via time-nuts
On 2/26/15 20:39, Charles Steinmetz wrote:
ben wrote:
I'm going to have to build one of these. Assume you have some sort of
circuit that converts low-voltage AC from a transformer secondary to
a pulse train, start a timer, and count x amount of pulses?
Here is a zero-cross detector designed
I presume that this is what my TTi TF930 does. Calibration is closed box so I
guess the TCXO is free running and the micro inside just uses calibration
constants.
James
-Original Message-
From: Paul Alfille paul.alfi...@gmail.com
To: Discussion of precise time and frequency
The TF930/960 does have a calibration procedure that is performed from
the front panel. Basically, you feed it a stable input from any known
source (so both 1 Hz and 10 MHz from a GPSDO should work) and then
adjust until the displayed frequency agrees with the known input
frequency. The
Hi,
AT575-142TTW-TNCF-000-RG-41-NM
Not all 575 antennas eat the same power. Its the RG in the part number above
that specifies 4.2V to 15V DC power for the internal LNA.
This is the most common option - but there are others.
--
Björn
div Originalmeddelande
In yesterday's Wall Street Journal (or maybe USA Today, I can't remember..)
Nice Nixie displays...
I wonder if it normally displays the same time on all, or if it is a
multi-time zone/elapsed time kind of thing. It looks a lot like clock
display stacks used for displaying Mission Elapsed
Check the price here:
Patek Philippe Digital Display Clock
| |
| | | | | | | |
| Patek Philippe Digital Display ClockVintage digital display clock by Patek
Philippe of Geneva. Made for Abou Watfa of Damascus, circa 1970. Rare Patek
Philippe digital clocks for sale at M.S. Rau
Hi
Thanks about the explanation on hysteresis and comparator.
The PM6685(http://assets.fluke.com/manuals/PM6685__smeng.pdf )
is using 74ALS176 as the frontend for REF channel.
So
I tried that on the previous board. The performance is better with
74ALS176+74LVC2G14 than MC100LVELT22 at
In yesterday's Wall Street Journal (or maybe USA Today, I can't remember..)
Nice Nixie displays...
I wonder if it normally displays the same time on all, or if it is a
multi-time zone/elapsed time kind of thing. It looks a lot like clock
display stacks used for displaying Mission Elapsed
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