Hi All;
Thanks for all the insight.
Cheers;
Tom Knox
303-554-0307
act...@hotmail.com
"Peace is not the absence of violence, but the presence of Justice" Both MLK
and Albert Einstein
From: time-nuts on behalf of John Ackermann
N8UR
Sent: Wednesday, October
Taka,
The chance of finding a cheap, used, working, replacement tube is rather
small. But...
1) One approach is keep looking for another 5071A that's not working and
selling cheap and hope very much that it's just the electronics that's
bad and the tube is still good. Then you can create
Hello Corby,
I keep my HP5065A powered on 24/7 with UPS backup. Like John, I
compare it once or twice a year (to a Thunderbolt running Lady
Heather) and adjust accordingly. I have modified the C-field
adjustment for higher resolution, original (coarse) control is now
under the hood and the fine
FWIW some measurements:
http://www.anderswallin.net/wp-content/uploads/2015/12/2015-12-17_fda_test_pn.png
and
http://www.anderswallin.net/wp-content/uploads/2016/09/fda_2016-09-12_PN.png
and
https://www.febo.com/pages/amplifier_phase_noise/
my ohwr-design uses better op-amps, giving slightly
I have an HP5071A with a high performance option that does not work. All of my
tests indicate the faulty component is a tube itself. Buying a new tube is way
out of my budget. I am now torn between parting it out and see what I can use
and keeping it intact with hope something might pop up.
Hi Corby,
I very new to this list and have been monitoring it for the last 6 months. I
was
interested in doing some time dilation experiments with some Cs, but had to
become a little
hesitant when I discovered the price of them.
My initial review of the Cs caused me to conclude there were not
Thanks, Bruce. That's pretty much it -- while the layout/lack of
shielded enclosure might have a bit to do with it, the opamps used
(MAX477) aren't super-duper low noise at the floor. The AD8055 we've
used in the lasts few batches since the MAX477 went unobtainium seems to
be a little quieter.
Corby,
I keep my No. 1 running all the time. Should be about 6 years since I
installed the optical filter.
Adrian
Am 23.10.2019 um 17:34 schrieb cdel...@juno.com:
Hi,
How many of you leave your 5065A on all the time?
Approximately how many years have you had it running without major
I have two 5065a's , both running continuously, one since Jan 2017 and once
since Mar 2018. One or the other is monitored every 25 sec by comparison to
a 5071a. I've had no trouble with either one. After a few months, the
ageing rate is so low its hard to measure, although there are environmental
Hi
If I’m doing stuff, they both are powered up. I run a GPSDO as the local
standard
so that is what runs 24/7/365. In a normal year, they are powered up about 50%
of the year.
Bob
> On Oct 23, 2019, at 11:34 AM, wrote:
>
> Hi,
>
> How many of you leave your 5065A on all the time?
>
>
Its measured noise floor is consistent with that expected from the noise
specifications for the opamps employed.
Bruce
> On 24 October 2019 at 08:46 Tom Knox wrote:
>
>
> Hi John;
> Amazing product, I did not realize you could use the TADD-1 for 100MHz
> distribution.
> I do have a
uBlox M8T & antenna behind two panes of glass
skyview is a 170 degree sweep centred 30 degrees east of south
I regularly see attenuation with overcast clouds, but only with some
overcast clouds. It's not consistent enough to be able to say which types.
The attenuation can be as much as 10 dBc,
As far as I know, my friend's GPS dropout problems have been associated with
simple clouds with no rain (at least no rain reaching the surface).
Dana
On Wed, Oct 23, 2019 at 2:00 PM Tim Shoppa wrote:
> I don't think clouds is the direct cause, but of course clouds in the sky
> can be
Hi John;
Amazing product, I did not realize you could use the TADD-1 for 100MHz
distribution.
I do have a question, as someone who has tested most of the commercially
available distribution amps on the market TADD-1's -140dB @ 1Hz is among the
very very best best in the industry, (nothing is
On Wed, Oct 23, 2019 at 2:04 PM ew via time-nuts
wrote:
>
> From Juerg Koegel
>
> 4$ Openlog
> 6$ Micro SD Card
> 1 hour work
> Bert Kehren___
> time-nuts mailing list -- time-nuts@lists.febo.com
> To unsubscribe, go to
>
I also have a BG7TBL, version 2019-03-25, and I use it with a small
embedded X64_64 pcengines box with a dedicated mPCI RS232 receiver.
See picture attached, the PCENGINES box is the black box below the
GPSDO.
>
> 1. The GPS chip onboard can be set via RS232C, for instance by u-center
> program.
Hi Corby --
I normally keep the 5065A running all the time -- it's usually set up as
the "house standard" and I tweak the frequency against Cs every few
months. You know more about its service history than I do. :-)
When it was working, I usually kept the 5061A running full time as local
time
I don't think clouds is the direct cause, but of course clouds in the sky
can be correlated with wet foliage.
Especially if the GPS Field Of View has a lot of angle taken up by tree
canopy, wet foliage can substantially degrade not just GPS reception but
other VHF and UHF signals.
I notice this
akumisz...@gmail.com said:
> 2. I would like to get both NMEA and PPS signal from it on the NTP server.
> Currently PPS is on pin 8 (CTS) but according to http://doc.ntp.org/4.1.1/
> driver22.htm and https://www.satsignal.eu/ntp/NTP-on-Windows-serial-port.html
> it should rather be on pin 1
FWIW, I designed the TADD-1 to have equal length signal paths for all six
channels.
73,
John
On Oct 23, 2019, 1:01 PM, at 1:01 PM, "Bill Dailey, MD, MSEng, MSMI"
wrote:
>I am working in a project that requires me to have very similarly
>phased
>10mhz references (beamforming).
>
>Previously I
If you're doing beam forming, the "one amp driving multiple
loads" approach is probably going to do the best and most
stable job of getting what you need. And all your loads should
be identical, not some mix of different makes/models.
But you will need to find an amplifier that can deliver the
Andy,
Isn't DirecTV downlinking around 12 GHz? Yet GPS L1 is at only ~1575
MHz. That's
a huge difference with regard to scattering losses, and probably a fair
amount of
difference for water absorption losses as well.
I've recommended that my old friend try putting his GPS antenna up in the
Tobias Pluess writes:
> Assume a timer is clocked with the 10MHz clock. The timer overflows
> when it reaches 999 (=10e6-1). Further, this timer is used to
> generate the 1PPS pulse output: each time when the timer reaches the
> value of 0, a pulse is generated on one of the output pins. Since
Having had DirecTV on the roof for a few years, and having experienced
regular significant signal loss events during heavy rain and snow (loss of
reception was a rather good predictor that "the skies were about to open
up" with rain), I can confirm that signal strength deteriorates noticeably
Corby
I do not run the 5061's or 5065 all the time. Only for checks and pump
downs.
Regards
Paul
WB8TSL
On Wed, Oct 23, 2019 at 12:10 PM wrote:
> Hi,
>
> How many of you leave your 5065A on all the time?
>
> Approximately how many years have you had it running without major
> maintenance?
>
>
I am working in a project that requires me to have very similarly phased
10mhz references (beamforming).
Previously I just used splitters for 10MHz but now I am graduating to a
distribution amplifier. Looking for suggestions/recommendations and what I
should consider. Distributing a Fury or a
On Wed, Oct 23, 2019 at 9:20 AM Martin Burnicki
wrote:
>
> shouldbe q931 wrote:
> > I recently acquired a pair of Meinberg M600's (with GPS-CON downconverters).
>
> Just a summary of what it's for:
>
> Most Meinberg GPS receivers expect an input signal that has been
> down-converted from the
Charles wrote:
>Well, there is a distinct difference between DAs that use a single
amplifier (discrete or integrated) to drive each output channel (as your
design does), and DAs that drive multiple outputs from each amplifier
using build-out resistors. In the case of the Extron
Hi,
How many of you leave your 5065A on all the time?
Approximately how many years have you had it running without major
maintenance?
My current "gold standard" 5065A has been running for over 5 years.
Cheers!
Corby
___
time-nuts mailing list --
Hi
You (sort of) have run into two problems:
1) The GPSDO takes forever and ever to lock ( = the gain is to low / the time
constant it to long)
2) The GPSDO has to much jitter ( = the gain is to high / the time constant is
to short)
Obviously, you can’t solve both of these problems by
Hi all.
I've been given a 5371A that i'll like to use to mesaure Allen Variation and
plot results with TimeLab.
Can somebody be so kind to give me some hints on how to do that ? (instrument
setup etc)
Regards,
Giorgio.
___
time-nuts mailing list --
Hi!
I just bought my first GPSDO (BG7TBL dated 2019-08-03 with Trimble 73090
and u-blox 7 series GPS chip – more info here:
https://www.eevblog.com/forum/testgear/bg7tbl-gpsdo-master-reference/msg2749310/#msg2749310).
I intend to connect it to a PC and use it as NTP and maybe PTP server, and
Hi colleagues
thanks to your inputs I could design the EFC circuit for my new GPSDO and I
think its quite clear how that will work.
So in the past days, I spent my spare time on thinking about the control
algorithm. I used FLL previously, which gave unsatisfactory results, so I think
PLL is
Luciano wrote:
The Extron is a very nice solution, certainly of modest price, but we must
consider * * * the low separation between the output channels.
Well, there is a distinct difference between DAs that use a single
amplifier (discrete or integrated) to drive each output
Achim, thank you for your graph and for the link to Dan Drown blog and
your suggestions. I am going to collect data and replicate his
research. I doubt I'll discover anything new, but it's interesting
nevertheless to look into these time series data.
-- Fio Cattaneo
Universal AC, can Entropy be
> My understanding is that it would work moderately well even without a
> stratum-1 server, at least be able to operate within a few tens of
> milliseconds for several hours. Although I confess I haven't used peering in
> a very long time. In my workplace we added stratum-1 GPS symmetricom NTP
>
shouldbe q931 wrote:
> I recently acquired a pair of Meinberg M600's (with GPS-CON downconverters).
Just a summary of what it's for:
Most Meinberg GPS receivers expect an input signal that has been
down-converted from the original L1 frequency.
The appropriate Meinberg antennae have a built-in
e...@scace.org said:
> proper display of 23:59:60, etc on the system clock & return of same to
> appropriate function calls.
I doubt if you will find that on any system with a Unix/POSIX background.
86400 seconds per day is just wired in too deeply to change.
>(In contrast, Microsoft
Eric,
You might want to try this thread over on the LEAPSECS list [1]. Yes,
there's a special list just for leap second nuts so that we don't have
to discuss them here on time-nuts. You'll find the archives deep,
fascinating, and often contentious. Practical real life examples like
your
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