Quoting jung.schorndorf--- via time-nuts, who wrote on Thu, Jun 09, 2022 at
04:26:08PM +0200 ..
hello Helmut,
> power supply unit for the GPS frequency standard
> from DATUM (Type MFS Modular Frequency Systems), I visited your homepage and
> registered on "time-nuts" mailing list.
> .
> May I
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
hi Skip,
Now, that was a very interesting read! The tenacity with debugging such a
variety of issues has to be admired!
At the same time I am quite surprised to see the messy (sorry, no insult
intended, but the original dead bug proto style can and is done a lot cleaner
than this) build
A thought has just crossed my mind, not sure if the idea is valid or not. The
idea is to re-purpose (parts of a) PLC network adapter. At the very least they
can be a source of line voltage rated parts I'd think.
But the low frequency characteristics make me wonder in this context, as PLC is
in
Given that it sounds that these capacitors are mains connected I would
recommend using Y rated capacitors for safety reasons. That should prevent them
from going short circuit, Y caps being designed to "fail open".
Or did I misunderstand the proposed circuit?
Wilko
> On 22 Jan 2022, at
; Bob
>
>> On Dec 23, 2021, at 8:42 AM, Wilko Bulte wrote:
>>
>> hi,
>>
>> I am currently trying to revive a Trimble UCCM-LPS ex-telco GPSDO.
>> The model is a 57963-D according to the PCB silkscreen.
>>
>> Got the board without its OCXO but
> On 23 Dec 2021, at 18:58, Attila Kinali wrote:
>
> On Thu, 23 Dec 2021 12:14:48 -0500
> Bob kb8tq wrote:
>
>> It’s a pretty good bet that the Vref is 5V
>
> A quick google lead me to this forum post:
>
> On 23 Dec 2021, at 18:47, Attila Kinali wrote:
>
> On Thu, 23 Dec 2021 14:42:27 +0100
> Wilko Bulte wrote:
>
>> A quick experiment learned that the OCXO freq responds to the EFC voltage.
>> So, looks like the Vref circuit in the OCXO has died.
>
> A
hi,
I am currently trying to revive a Trimble UCCM-LPS ex-telco GPSDO.
The model is a 57963-D according to the PCB silkscreen.
Got the board without its OCXO but luckily my stash of surplus I have
discovered a Trimble OCXO labeled 72345-86. Given that that OCXO also has a
label UCCM-LPS it
one unit.
Sofar all amps I could get centered on 10MHz with 150 or 180pF total
capacitance.
Maybe even better 'peaking' can be achieved with a differen toroid coil but
I decided that that was too much hassle (these things are attached to the
PCB globs of silicone sealant "goo").
Wilko
hi Paul, Bob,
Is there a significant difference between these telco-surplus Rb and the more
'fancy' ones in this regard?
I happen to own an Efratom MRK-HLN, which, I presume, is also more geared
towards "always on". So, I wonder would the MRK be better or worse compared to
a telco-surplus
fit is quite
> small.
>
> Indeed there was some beer involved in the discussion, but HP OCXO
> engineering was onboard with the above information last time we chatted
> about it. That would have been in the early 1990’s …. These failures have
> been going on for a *long* time.
For those interested, Dave PA5DOF and your's truly are working to get the
doubler implemented that Luciano has on his website. The first PCB prototype is
in and has been built and works OK. Some minor tweaks/fixes will be added to a
V0.2 PCB. If there is interest I can share the Gerber files.
Being curious here: has anyone ever taken a Cs in a submarine? E.g. the
Marianatrench or so?
As a native from a mountain-deprived country I could not help wondering.
Wilko
> On 28 Nov 2021, at 08:14, Tom Van Baak wrote:
>
> Hi Thomas,
>
> Good to hear the experiment was contagious for you.
Another option would be a Meinberg NTP appliance.
https://www.meinbergglobal.com/
I have implemented a couple (for geographically dispersed data centres) of the
Meinberg LANtime M300 about 10'years back. They still run without a hitch, and
have done so without ever failing. "Ours" are dual
Santa is testing his new SteSle[tm]? *)
Kidding aside, maybe it is an idea to see if the position reported by the
various GPS starts to "wander"? I assume any spoofing/scrambling should be
noticable too, apart from the SV plot that LH reports.
Maybe good GPS reject "implausible" SV locations
hi,
I checked with Tom and he OK-ed me posting this:
As you probably have seen my ham buddy Dave & I possess some surplus modules
from the Efratom MFS that we would like sell to a "time-nutty" enthousiast for
a "time-nutty" price. Or "amateur price", as we ham's tend to call it here in
NL. We
. Some do really fantastic projects like restore H Masers. But
> many of us are simply lowly Cesium and Rubidium references and then the
> lazy persons answer a GPDSO. (I like lazy)
> You will fit in well and we always appreciate projects, insights, and
> sharing.
> Enjoy
> Paul
> W
hi,
Thought it be good to introduce myself, being new to the list etc.
My name is Wilko, I am a ham operator located in Arnhem, the eastern part of
the Netherlands, callsign PA1WBU. There is at least one list member that knows
me (hi Poul ;)
I recently found myself with 2x UCCM GPSDO, a FEI Rb
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