Hello,
Is there any disadvantage of using SR620 with TimeLab as described in high
res freq. measurement document of SRS ?
1) DUT (10MHz) is connected to External Clock In
2) REF OUT (1kHz) is connected to ChA
3) GPS receiver PPS output configured as 1kHz and is connected to ChB.
4) Sample size 10
My antenna is active and it uses 5 volts. I tried 2 different mushroom type
antennas with pipe mounts and ironically a magnet mount. Automotive antenna
outperforms it even with several feet of RG 174 cable. Go figure??Sent from my
Verizon, Samsung Galaxy smartphone by Morse code.
Orig
I really don't care about the 1024 week roll over. My only concern is the 10
MHz stability. I have my frequency counter, spectrum analyzer, my 8VSB
analyzer and my network analyzer locked to 10 MHz. I am using Belden 9913
cable for my antenna feed and I am reluctant to go to LMR type cable S
I was curious and looked up the Datum unit. In the datasheet, there's
this option:
26B55144 HIGH GAIN GPS ANTENNA
This antenna supports an antenna cable loss of up to
35dB. It is required for Option 20D (400'/120 m) or
20E (500'/150 m) antenna cables.
So, 200' should be no sweat, if you use
Hi Jack.
At work I had to bring GPS signal to one of our labs, which is in the
middle of a building with no rooftop access or nearby window. The only I
was able to do it was to bring a long run of LMR400 cable from my
rooftop antenna on top of the building which connects to a GNSS splitter
am
I suppose you could do a split type distribution of the conversion
functions, but it may be simpler to just add some more gain at L1 with
an in-line amplifier - preferably close to the far (antenna) end. You'd
have to work out how to provide the DC power for it, like taking some 5V
supply curre
I have a Datum Exactime ET-6000TCXO that I use to lock all my test equipment to
10 MHz. My GPS antenna is approximately 200 feet from the receiver and I have
intermittent GPS signal levels and associated unlocking of my ET-6000TCXO. I
have tried using bigger less loss coax cable but its jus
I was too fast to click send, there is a graphical client for GPSD :
https://gpsd.io/xgps-sample.html
That is OK for me !
Best regards,
Claude
Le 02/03/2022 17:47, va2...@ebox.net a écrit :
Hi Wilko and Bryan.
I was the one who asked and I'm also interested in getting more
information, bo
Hi Wilko and Bryan.
I was the one who asked and I'm also interested in getting more
information, both on your project and using GPSD as suggested earlier.
Thank you,
Claude
Le 02/03/2022 14:06, Bryan _ a écrit :
CAUTION: This email originated from outside your organization.
Exercise cauti
Yes, from what I can tell, that is a completely different and unrelated
PSU. Mine has no rectifiers of any kind, so it definitely can't run from
AC. All the large TO packages on the primary side are IRFP250 MOSFETs. I
actually found in my stash of stuff a 2A rated 32V PSU, and since it was
drawi
On 3/2/22 6:00 AM, paul swed wrote:
As Ed stated Switchers feeding switchers can be problematic. What I found I
had to do was put a relay in series with a slight time delay. This allows
the primary switcher to come up and then gets slammed into the secondary
SPS. Could be a fet/transistor switch.
Hi Erik,
On 2022-02-26 17:36, Erik Kaashoek wrote:
Magnus, Bob,
Thanks for the replies.
@Magnus, I need to study your input a bit longer. What I currently
fail to understand is : Should there be a low pass filter with a 1/100
s corner frequency in series with the Vtune when the ADEV of the
VC
Hi all,
I think
I've asked this before, but might anyone have a manual for a Precision Standard
Time 1020? I have one which works great but still wonder if there may be manual
to be had out there. Brooke Clarke's
web page has some info on this unit, the PST 1020 I assume must be fairly rare
an
Hi Wilko:
I was not the OP, but I would be interested in the details of your project.
Cheers
-=Bryan=-
From: Wilko Bulte
Sent: March 2, 2022 10:41 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by
On 02/03/2022 17:34, va2...@ebox.net wrote:
Hello to all members.
I want to add to my lab a Pi based display that would show a GNSS SV map
like the one attached to this message.
Any suggestions ?
Thank you !
Claude VA2 HDD
Claude,
I would look into gpsd. I guess someone will have made a g
Hi Brian.
I was aware that running Lady Heater on a Pi is possible, but I don't
know how to display only the SV map with Lady Heater. I will have to
search that part.
Thank you for the suggestion,
Claude
Le 02/03/2022 12:57, Bryan _ a écrit :
CAUTION: This email originated from outside y
hello Bryan,
Runnimg LH on a *Pi is feasible without any problems. I have built such a setup
myself, it lives in my shack and is based on a Samsung UCCM GPSDO (telco
surplus obtained in China). The Pi in question is an OrangePi Zero running
Armbian Linux. It runs an Xdesktop on top of a VNCserv
Just to clarify, HP z3816a that is referenced in this thread
(http://www.realhamradio.com/GPS_Z3816A_Receiver.htm) is actually mine. I
bought it many years ago from a gentleman in Korea and it is unusual in that it
came with a 9 pin RS-232 connector and a 120v built-in power supply. I haven't
m
I have seen a project where ladyheather is run off a PI, suppose you could just
configure LH to display what you need.
-=Bryan=-
From: va2...@ebox.net
Sent: March 2, 2022 9:34 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] Re:
Hello to all members.
I want to add to my lab a Pi based display that would show a GNSS SV map
like the one attached to this message.
Any suggestions ?
Thank you !
Claude VA2 HDD
___
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As Ed stated Switchers feeding switchers can be problematic. What I found I
had to do was put a relay in series with a slight time delay. This allows
the primary switcher to come up and then gets slammed into the secondary
SPS. Could be a fet/transistor switch. So linear is preferable.
Regards
Paul
On 01/03/2022 22:43, Bob kb8tq wrote:
Assuming you are south of Hadrian’s Wall, you will have GPS sats overhead
at least occasionally. The bulk of what you will be able to “see” will be to the
south. If you really have a good antenna location and are a bit north, you may
be able to “see” sats on
>Bob said - " A GPSDO with a poor sky view will not do well"
Thanks for the feedback.
I am exactly 100 miles South of Hadrian's wall and a smidgeon West of The Prime
Meridian. My house is in pretty clear surroundings except for a large willow
tree in the front garden, which faces South. I can e
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