JM
John Moran, Scawby Design
Tue, Mar 1, 2022 10:11 PM
Bob, Jim - Thanks for the detailed replies. You have both managed to confirm the difficulties and unknowns involved in being a fledgling TimeNut.
I think that is what prompted me to try to avoid as many unknowns as possible by buying one that was at least guaranteed to work, especially in the un-locked mode because I'm not sure what my GPS viewing here will be like until I have a unit to play with.
A problem we have over here is that there isn't the huge eBay market for such things, so choice is really limited to Chinese recycled/cloned stuff of unknown provenance. OK, I could buy from a US supplier but, and I will probably be jumped on for saying this, US suppliers seem incapable of finding reasonably priced delivery methods. A recent example was a nice slide rule I was interested in for $36, but carriage was $86 ... I didn't buy.
Getting back to GPSDOs - given that, when locked, they are probably all quoted as 'close to Caesium' (British), I will still buy a new one, but more reasonably priced and then try to acquire an SC-cut crystal to start making an OCXO to eventually form the heart of a GPSDO. I like the comments about holdover and recovery from holdover ... one of you keeps talking about rabbit holes, I think I see one looming.
John
Bob, Jim - Thanks for the detailed replies. You have both managed to confirm the difficulties and unknowns involved in being a fledgling TimeNut.
I think that is what prompted me to try to avoid as many unknowns as possible by buying one that was at least guaranteed to work, especially in the un-locked mode because I'm not sure what my GPS viewing here will be like until I have a unit to play with.
A problem we have over here is that there isn't the huge eBay market for such things, so choice is really limited to Chinese recycled/cloned stuff of unknown provenance. OK, I could buy from a US supplier but, and I will probably be jumped on for saying this, US suppliers seem incapable of finding reasonably priced delivery methods. A recent example was a nice slide rule I was interested in for $36, but carriage was $86 ... I didn't buy.
Getting back to GPSDOs - given that, when locked, they are probably all quoted as 'close to Caesium' (British), I will still buy a new one, but more reasonably priced and then try to acquire an SC-cut crystal to start making an OCXO to eventually form the heart of a GPSDO. I like the comments about holdover and recovery from holdover ... one of you keeps talking about rabbit holes, I think I see one looming.
John
BK
Bob kb8tq
Tue, Mar 1, 2022 10:43 PM
Hi
A GPSDO with a poor sky view will not do well. They are designed with the
“assumption” that you will have a good lock unless the antenna gets hit by
lightning ( or some other catastrophe ).
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 the other side of the north pole. More or less, there
is a big coverage blank area over the poles with GPS.
The closer you get to either pole, you will need to have a fairly good view closer
to the horizon than you would at the equator. Still something like a 20 degree
view should be “good enough”.
One way to get an idea of what’s what is to buy a $10 USB plug in GPS. Fire
up any of the many tracking / display programs and see what sort of plots you get.
It might be a bit cold to sit on the roof with a setup like this, but at least you
will get an idea.
Bob
On Mar 1, 2022, at 5:11 PM, John Moran, Scawby Design john@scawbydesign.co.uk wrote:
Bob, Jim - Thanks for the detailed replies. You have both managed to confirm the difficulties and unknowns involved in being a fledgling TimeNut.
I think that is what prompted me to try to avoid as many unknowns as possible by buying one that was at least guaranteed to work, especially in the un-locked mode because I'm not sure what my GPS viewing here will be like until I have a unit to play with.
A problem we have over here is that there isn't the huge eBay market for such things, so choice is really limited to Chinese recycled/cloned stuff of unknown provenance. OK, I could buy from a US supplier but, and I will probably be jumped on for saying this, US suppliers seem incapable of finding reasonably priced delivery methods. A recent example was a nice slide rule I was interested in for $36, but carriage was $86 ... I didn't buy.
Getting back to GPSDOs - given that, when locked, they are probably all quoted as 'close to Caesium' (British), I will still buy a new one, but more reasonably priced and then try to acquire an SC-cut crystal to start making an OCXO to eventually form the heart of a GPSDO. I like the comments about holdover and recovery from holdover ... one of you keeps talking about rabbit holes, I think I see one looming.
John
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
Hi
A GPSDO with a poor sky view will not do well. They are designed with the
“assumption” that you will have a good lock unless the antenna gets hit by
lightning ( or some other catastrophe ).
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 the other side of the north pole. More or less, there
is a big coverage blank area over the poles with GPS.
The closer you get to either pole, you will need to have a fairly good view closer
to the horizon than you would at the equator. Still something like a 20 degree
view should be “good enough”.
One way to get an idea of what’s what is to buy a $10 USB plug in GPS. Fire
up any of the many tracking / display programs and see what sort of plots you get.
It might be a bit cold to sit on the roof with a setup like this, but at least you
will get an idea.
Bob
> On Mar 1, 2022, at 5:11 PM, John Moran, Scawby Design <john@scawbydesign.co.uk> wrote:
>
> Bob, Jim - Thanks for the detailed replies. You have both managed to confirm the difficulties and unknowns involved in being a fledgling TimeNut.
>
> I think that is what prompted me to try to avoid as many unknowns as possible by buying one that was at least guaranteed to work, especially in the un-locked mode because I'm not sure what my GPS viewing here will be like until I have a unit to play with.
>
> A problem we have over here is that there isn't the huge eBay market for such things, so choice is really limited to Chinese recycled/cloned stuff of unknown provenance. OK, I could buy from a US supplier but, and I will probably be jumped on for saying this, US suppliers seem incapable of finding reasonably priced delivery methods. A recent example was a nice slide rule I was interested in for $36, but carriage was $86 ... I didn't buy.
>
> Getting back to GPSDOs - given that, when locked, they are probably all quoted as 'close to Caesium' (British), I will still buy a new one, but more reasonably priced and then try to acquire an SC-cut crystal to start making an OCXO to eventually form the heart of a GPSDO. I like the comments about holdover and recovery from holdover ... one of you keeps talking about rabbit holes, I think I see one looming.
>
> John
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
> To unsubscribe, go to and follow the instructions there.
TH
Tom Holmes
Tue, Mar 1, 2022 11:11 PM
John...
If you haven't already, look into the Leo Bodnar GPSDO. It is a couple hundred bucks US, and the people I know who have them
are pretty happy with them. Not sure off the top of my head if they make a PPS, however. And, he is in the UK.
Tom Holmes, N8ZM
-----Original Message-----
From: John Moran, Scawby Design john@scawbydesign.co.uk
Sent: Tuesday, March 01, 2022 5:12 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
Bob, Jim - Thanks for the detailed replies. You have both managed to confirm the difficulties and unknowns involved in being
a fledgling TimeNut.
I think that is what prompted me to try to avoid as many unknowns as possible by buying one that was at least guaranteed to
work, especially in the un-locked mode because I'm not sure what my GPS viewing here will be like until I have a unit to play
with.
A problem we have over here is that there isn't the huge eBay market for such things, so choice is really limited to Chinese
recycled/cloned stuff of unknown provenance. OK, I could buy from a US supplier but, and I will probably be jumped on for
saying this, US suppliers seem incapable of finding reasonably priced delivery methods. A recent example was a nice slide
rule I was interested in for $36, but carriage was $86 ... I didn't buy.
Getting back to GPSDOs - given that, when locked, they are probably all quoted as 'close to Caesium' (British), I will still
buy a new one, but more reasonably priced and then try to acquire an SC-cut crystal to start making an OCXO to eventually
form the heart of a GPSDO. I like the comments about holdover and recovery from holdover ... one of you keeps talking about
rabbit holes, I think I see one looming.
John
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
John...
If you haven't already, look into the Leo Bodnar GPSDO. It is a couple hundred bucks US, and the people I know who have them
are pretty happy with them. Not sure off the top of my head if they make a PPS, however. And, he is in the UK.
Tom Holmes, N8ZM
-----Original Message-----
From: John Moran, Scawby Design <john@scawbydesign.co.uk>
Sent: Tuesday, March 01, 2022 5:12 PM
To: time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
Bob, Jim - Thanks for the detailed replies. You have both managed to confirm the difficulties and unknowns involved in being
a fledgling TimeNut.
I think that is what prompted me to try to avoid as many unknowns as possible by buying one that was at least guaranteed to
work, especially in the un-locked mode because I'm not sure what my GPS viewing here will be like until I have a unit to play
with.
A problem we have over here is that there isn't the huge eBay market for such things, so choice is really limited to Chinese
recycled/cloned stuff of unknown provenance. OK, I could buy from a US supplier but, and I will probably be jumped on for
saying this, US suppliers seem incapable of finding reasonably priced delivery methods. A recent example was a nice slide
rule I was interested in for $36, but carriage was $86 ... I didn't buy.
Getting back to GPSDOs - given that, when locked, they are probably all quoted as 'close to Caesium' (British), I will still
buy a new one, but more reasonably priced and then try to acquire an SC-cut crystal to start making an OCXO to eventually
form the heart of a GPSDO. I like the comments about holdover and recovery from holdover ... one of you keeps talking about
rabbit holes, I think I see one looming.
John
_______________________________________________
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
W
Wes
Wed, Mar 2, 2022 12:36 AM
I just acquired my second Bodnar GPSDO, a single frequency model. I have the
two frequency model already. They don't do 1pps. They are sold in the US by
Airspy but I have had better luck buying from SDR-Kits in the UK. Not much
difference in price, they are friendlier and the delivery is just as fast.
Wes N7WS.
On 3/1/2022 4:11 PM, Tom Holmes wrote:
John...
If you haven't already, look into the Leo Bodnar GPSDO. It is a couple hundred bucks US, and the people I know who have them
are pretty happy with them. Not sure off the top of my head if they make a PPS, however. And, he is in the UK.
Tom Holmes, N8ZM
I just acquired my second Bodnar GPSDO, a single frequency model. I have the
two frequency model already. They don't do 1pps. They are sold in the US by
Airspy but I have had better luck buying from SDR-Kits in the UK. Not much
difference in price, they are friendlier and the delivery is just as fast.
Wes N7WS.
On 3/1/2022 4:11 PM, Tom Holmes wrote:
> John...
>
> If you haven't already, look into the Leo Bodnar GPSDO. It is a couple hundred bucks US, and the people I know who have them
> are pretty happy with them. Not sure off the top of my head if they make a PPS, however. And, he is in the UK.
>
> Tom Holmes, N8ZM
>
MB
Mete Balci
Wed, Mar 2, 2022 7:12 AM
I am new to the topic of time measurement, freq. standards and GPSDO etc.
but would like to share my experience.
I have quite a bad location for a GPS/GNSS antenna, inside an apartment and
looking to the north, and I need ~20m of cable to get it to my desk (using
RG58). The only good thing is I have a pretty open view almost from the
west to the east. Directly in the north direction, there is literally no
GPS/GNSS orbit (it is fun to confirm this with an astronomy program), but I
catch the ones on the sides.
I have a DIY GPSDO made in Japan (as far as I know it is different from
BG7TBL), LeoBodnar dual output GPSDO, and ublox M8T and F9T modules. The
DIY Japanese one has a ublox 7th gen receiver, and it cannot lock most of
the time. I believe the sensitivity is too low. LeoBodnar has a ublox 8th
gen receiver. It was mostly working but sometimes losing the lock, so I
installed an inline amplifier and then it is working pretty OK (Japanese
one does not work well with the inline amplifier also), I never see the
LEDs blinking so I guess it never loses the lock. It is a nice device but
- you cannot use ublox u-center software, 2) it does not have a PPS
output. I tried M8T and F9T modules also, and they also work pretty fine.
F9T is dual freq. and I can use it in Time mode so actually I am planning
to use it to discipline a RbXO.
A puzzling question is I have C/N0 values maximum around 35, usually
between 20-30. My understanding is normally it has to be more than 40. I
did not understand yet why it is low but my current guess is it is due to
interference etc. because the antenna is not at the roof. (further
complications, I think my building is a steel construction, the window is a
little inside with a surrounding steel structure like a very large diameter
but small length tube).
So if you have a limited sky view or dont have an antenna on the roof, I
recommend getting a GPSDO having at least a ublox 8th gen receiver or
equivalent. I would like to try a Thunderbolt for example but not sure
about their sensitivity, not even sure if the sensitivity of Thunderbolt E
would be OK for my location.
Mete
On Wed, Mar 2, 2022 at 1:45 AM Wes wes@triconet.org wrote:
I just acquired my second Bodnar GPSDO, a single frequency model. I have
the
two frequency model already. They don't do 1pps. They are sold in the US
by
Airspy but I have had better luck buying from SDR-Kits in the UK. Not
much
difference in price, they are friendlier and the delivery is just as fast.
Wes N7WS.
On 3/1/2022 4:11 PM, Tom Holmes wrote:
John...
If you haven't already, look into the Leo Bodnar GPSDO. It is a couple
hundred bucks US, and the people I know who have them
are pretty happy with them. Not sure off the top of my head if they
make a PPS, however. And, he is in the UK.
I am new to the topic of time measurement, freq. standards and GPSDO etc.
but would like to share my experience.
I have quite a bad location for a GPS/GNSS antenna, inside an apartment and
looking to the north, and I need ~20m of cable to get it to my desk (using
RG58). The only good thing is I have a pretty open view almost from the
west to the east. Directly in the north direction, there is literally no
GPS/GNSS orbit (it is fun to confirm this with an astronomy program), but I
catch the ones on the sides.
I have a DIY GPSDO made in Japan (as far as I know it is different from
BG7TBL), LeoBodnar dual output GPSDO, and ublox M8T and F9T modules. The
DIY Japanese one has a ublox 7th gen receiver, and it cannot lock most of
the time. I believe the sensitivity is too low. LeoBodnar has a ublox 8th
gen receiver. It was mostly working but sometimes losing the lock, so I
installed an inline amplifier and then it is working pretty OK (Japanese
one does not work well with the inline amplifier also), I never see the
LEDs blinking so I guess it never loses the lock. It is a nice device but
1) you cannot use ublox u-center software, 2) it does not have a PPS
output. I tried M8T and F9T modules also, and they also work pretty fine.
F9T is dual freq. and I can use it in Time mode so actually I am planning
to use it to discipline a RbXO.
A puzzling question is I have C/N0 values maximum around 35, usually
between 20-30. My understanding is normally it has to be more than 40. I
did not understand yet why it is low but my current guess is it is due to
interference etc. because the antenna is not at the roof. (further
complications, I think my building is a steel construction, the window is a
little inside with a surrounding steel structure like a very large diameter
but small length tube).
So if you have a limited sky view or dont have an antenna on the roof, I
recommend getting a GPSDO having at least a ublox 8th gen receiver or
equivalent. I would like to try a Thunderbolt for example but not sure
about their sensitivity, not even sure if the sensitivity of Thunderbolt E
would be OK for my location.
Mete
On Wed, Mar 2, 2022 at 1:45 AM Wes <wes@triconet.org> wrote:
> I just acquired my second Bodnar GPSDO, a single frequency model. I have
> the
> two frequency model already. They don't do 1pps. They are sold in the US
> by
> Airspy but I have had better luck buying from SDR-Kits in the UK. Not
> much
> difference in price, they are friendlier and the delivery is just as fast.
>
> Wes N7WS.
>
> On 3/1/2022 4:11 PM, Tom Holmes wrote:
> > John...
> >
> > If you haven't already, look into the Leo Bodnar GPSDO. It is a couple
> hundred bucks US, and the people I know who have them
> > are pretty happy with them. Not sure off the top of my head if they
> make a PPS, however. And, he is in the UK.
> >
> > Tom Holmes, N8ZM
> >
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send
> an email to time-nuts-leave@lists.febo.com
> To unsubscribe, go to and follow the instructions there.
EK
Erik Kaashoek
Wed, Mar 2, 2022 7:35 AM
Just happen to be evaluating my own GPSDO design and part of it is
evaluating a cheap GPS module
The measurement done is the phase of the PPS versus a Rb standard.
One measurement was done with a roof top GPS antenna, the other with the
antenna at an east facing window.
The difference is striking. Where the phase of rooftop antenna
measurement has very little phase wandering at all (the Rb is a bit out
of tune)
the phase with the east facing antenna wandered 6e-7 s in 30 minutes.
(see attached phase plot)
My location is several hundred kilometers south of Hadrian's wall and
one timezone to the east.
Erik.
On 1-3-2022 23:43, Bob kb8tq wrote:
Hi
A GPSDO with a poor sky view will not do well. They are designed with the
“assumption” that you will have a good lock unless the antenna gets hit by
lightning ( or some other catastrophe ).
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 the other side of the north pole. More or less, there
is a big coverage blank area over the poles with GPS.
The closer you get to either pole, you will need to have a fairly good view closer
to the horizon than you would at the equator. Still something like a 20 degree
view should be “good enough”.
One way to get an idea of what’s what is to buy a $10 USB plug in GPS. Fire
up any of the many tracking / display programs and see what sort of plots you get.
It might be a bit cold to sit on the roof with a setup like this, but at least you
will get an idea.
Bob
Just happen to be evaluating my own GPSDO design and part of it is
evaluating a cheap GPS module
The measurement done is the phase of the PPS versus a Rb standard.
One measurement was done with a roof top GPS antenna, the other with the
antenna at an east facing window.
The difference is striking. Where the phase of rooftop antenna
measurement has very little phase wandering at all (the Rb is a bit out
of tune)
the phase with the east facing antenna wandered 6e-7 s in 30 minutes.
(see attached phase plot)
My location is several hundred kilometers south of Hadrian's wall and
one timezone to the east.
Erik.
On 1-3-2022 23:43, Bob kb8tq wrote:
> Hi
>
> A GPSDO with a poor sky view will not do well. They are designed with the
> “assumption” that you will have a good lock unless the antenna gets hit by
> lightning ( or some other catastrophe ).
>
> 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 the other side of the north pole. More or less, there
> is a big coverage blank area over the poles with GPS.
>
> The closer you get to either pole, you will need to have a fairly good view closer
> to the horizon than you would at the equator. Still something like a 20 degree
> view should be “good enough”.
>
> One way to get an idea of what’s what is to buy a $10 USB plug in GPS. Fire
> up any of the many tracking / display programs and see what sort of plots you get.
> It might be a bit cold to sit on the roof with a setup like this, but at least you
> will get an idea.
>
> Bob
>
DT
David Taylor
Wed, Mar 2, 2022 11:49 AM
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 the other side of the north pole. More or less, there
is a big coverage blank area over the poles with GPS.
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 the other side of the north pole. More or less, there
> is a big coverage blank area over the poles with GPS.
Even north of Hadrian's wall we get GNSS satellites overhead. Here's with an
indoor antenna dual-band setup. None reach 40 dB.
David
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv
V
va2hdd@ebox.net
Wed, Mar 2, 2022 5:34 PM
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
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
B_
Bryan _
Wed, Mar 2, 2022 5:57 PM
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: va2hdd@ebox.net va2hdd@ebox.net
Sent: March 2, 2022 9:34 AM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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
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: va2hdd@ebox.net <va2hdd@ebox.net>
Sent: March 2, 2022 9:34 AM
To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com>
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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
V
va2hdd@ebox.net
Wed, Mar 2, 2022 6:38 PM
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 your organization.
Exercise caution when opening attachments or on clicking links from
unknown senders.
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: va2hdd@ebox.net va2hdd@ebox.net
Sent: March 2, 2022 9:34 AM
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
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 your organization.
> Exercise caution when opening attachments or on clicking links from
> unknown senders.
>
>
> 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: va2hdd@ebox.net <va2hdd@ebox.net>
>
> Sent: March 2, 2022 9:34 AM
>
> To: Discussion of precise time and frequency measurement
> <time-nuts@lists.febo.com>
>
> Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
>
>
>
> 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
>
>
>
>
>
> _______________________________________________
>
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
> send an email to time-nuts-leave@lists.febo.com
>
> To unsubscribe, go to and follow the instructions there.
WB
Wilko Bulte
Wed, Mar 2, 2022 6:41 PM
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 VNCserver. Obviously LH shows herself on that desktop ;-) This whole shebang allows running the GPSDO/OrangePi combo to run headless (i.e. without a display), one can use any VNCclient to check on LH via the network. Laptop, tablet, even a smartphone can be used to monitor the GPSDO. The OrangePi has both Wlan as well as wired Ethernet options.
Hope this makes sense, I did an article for Electron, the monthly of the Dutch VERON ham organisation. In Dutch, for obvious reasons. But can make it available if there is interest.
Wilko
PA1WBU
On 2 Mar 2022, at 19:21, Bryan _ bpl521@outlook.com wrote:
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: va2hdd@ebox.net va2hdd@ebox.net
Sent: March 2, 2022 9:34 AM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
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 VNCserver. Obviously LH shows herself on that desktop ;-) This whole shebang allows running the GPSDO/OrangePi combo to run headless (i.e. without a display), one can use any VNCclient to check on LH via the network. Laptop, tablet, even a smartphone can be used to monitor the GPSDO. The OrangePi has both Wlan as well as wired Ethernet options.
Hope this makes sense, I did an article for Electron, the monthly of the Dutch VERON ham organisation. In Dutch, for obvious reasons. But can make it available if there is interest.
Wilko
PA1WBU
> On 2 Mar 2022, at 19:21, Bryan _ <bpl521@outlook.com> wrote:
>
> 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: va2hdd@ebox.net <va2hdd@ebox.net>
> Sent: March 2, 2022 9:34 AM
> To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com>
> Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
>
> 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
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
> To unsubscribe, go to and follow the instructions there.
DT
David Taylor
Wed, Mar 2, 2022 6:47 PM
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 graphical add-on, if
not a text simulation of a graphical display. Mine was u-blox u-center with a
serial line actually from an RPi HAT, operated stand-alone.
73,
David GM8ARV
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv
On 02/03/2022 17:34, va2hdd@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 graphical add-on, if
not a text simulation of a graphical display. Mine was u-blox u-center with a
serial line actually from an RPi HAT, operated stand-alone.
73,
David GM8ARV
--
SatSignal Software - Quality software for you
Web: https://www.satsignal.eu
Email: david-taylor@blueyonder.co.uk
Twitter: @gm8arv
B_
Bryan _
Wed, Mar 2, 2022 7:06 PM
Hi Wilko:
I was not the OP, but I would be interested in the details of your project.
Cheers
-=Bryan=-
From: Wilko Bulte wkb@xs4all.nl
Sent: March 2, 2022 10:41 AM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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 VNCserver. Obviously LH shows herself on that desktop ;-) This whole shebang allows running the GPSDO/OrangePi combo to run headless (i.e. without a display), one can use any VNCclient to check on LH via the network. Laptop, tablet, even a smartphone can be used to monitor the GPSDO. The OrangePi has both Wlan as well as wired Ethernet options.
Hope this makes sense, I did an article for Electron, the monthly of the Dutch VERON ham organisation. In Dutch, for obvious reasons. But can make it available if there is interest.
Wilko
PA1WBU
On 2 Mar 2022, at 19:21, Bryan _ bpl521@outlook.com wrote:
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: va2hdd@ebox.net va2hdd@ebox.net
Sent: March 2, 2022 9:34 AM
To: Discussion of precise time and frequency measurement time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
Hi Wilko:
I was not the OP, but I would be interested in the details of your project.
Cheers
-=Bryan=-
________________________________
From: Wilko Bulte <wkb@xs4all.nl>
Sent: March 2, 2022 10:41 AM
To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com>
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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 VNCserver. Obviously LH shows herself on that desktop ;-) This whole shebang allows running the GPSDO/OrangePi combo to run headless (i.e. without a display), one can use any VNCclient to check on LH via the network. Laptop, tablet, even a smartphone can be used to monitor the GPSDO. The OrangePi has both Wlan as well as wired Ethernet options.
Hope this makes sense, I did an article for Electron, the monthly of the Dutch VERON ham organisation. In Dutch, for obvious reasons. But can make it available if there is interest.
Wilko
PA1WBU
> On 2 Mar 2022, at 19:21, Bryan _ <bpl521@outlook.com> wrote:
>
> 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: va2hdd@ebox.net <va2hdd@ebox.net>
> Sent: March 2, 2022 9:34 AM
> To: Discussion of precise time and frequency measurement <time-nuts@lists.febo.com>
> Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
>
> 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
>
>
> _______________________________________________
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
> To unsubscribe, go to and follow the instructions there.
_______________________________________________
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
V
va2hdd@ebox.net
Wed, Mar 2, 2022 10:47 PM
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 caution when opening attachments or on clicking links from
unknown senders.
Hi Wilko:
I was not the OP, but I would be interested in the details of your
project.
Cheers
-=Bryan=-
From: Wilko Bulte wkb@xs4all.nl
Sent: March 2, 2022 10:41 AM
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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
VNCserver. Obviously LH shows herself on that desktop ;-) This whole
shebang allows running the GPSDO/OrangePi combo to run headless (i.e.
without a display), one can use any VNCclient to check on LH via the
network. Laptop, tablet, even a smartphone can be used to monitor the
GPSDO. The OrangePi has both Wlan as well as wired Ethernet options.
Hope this makes sense, I did an article for Electron, the monthly of
the Dutch VERON ham organisation. In Dutch, for obvious reasons. But
can make it available if there is interest.
Wilko
PA1WBU
On 2 Mar 2022, at 19:21, Bryan _ bpl521@outlook.com wrote:
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: va2hdd@ebox.net va2hdd@ebox.net
Sent: March 2, 2022 9:34 AM
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
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 caution when opening attachments or on clicking links from
> unknown senders.
>
>
> Hi Wilko:
>
>
>
> I was not the OP, but I would be interested in the details of your
> project.
>
>
>
> Cheers
>
>
>
>
>
> -=Bryan=-
>
> ________________________________
>
> From: Wilko Bulte <wkb@xs4all.nl>
>
> Sent: March 2, 2022 10:41 AM
>
> To: Discussion of precise time and frequency measurement
> <time-nuts@lists.febo.com>
>
> Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
>
>
>
> 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
> VNCserver. Obviously LH shows herself on that desktop ;-) This whole
> shebang allows running the GPSDO/OrangePi combo to run headless (i.e.
> without a display), one can use any VNCclient to check on LH via the
> network. Laptop, tablet, even a smartphone can be used to monitor the
> GPSDO. The OrangePi has both Wlan as well as wired Ethernet options.
>
>
>
> Hope this makes sense, I did an article for Electron, the monthly of
> the Dutch VERON ham organisation. In Dutch, for obvious reasons. But
> can make it available if there is interest.
>
>
>
> Wilko
>
> PA1WBU
>
>
>
>> On 2 Mar 2022, at 19:21, Bryan _ <bpl521@outlook.com> wrote:
>
>>
>
>> 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: va2hdd@ebox.net <va2hdd@ebox.net>
>
>> Sent: March 2, 2022 9:34 AM
>
>> To: Discussion of precise time and frequency measurement
>> <time-nuts@lists.febo.com>
>
>> Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
>
>>
>
>> 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
>
>>
>
>>
>
>> _______________________________________________
>
>> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
>> send an email to time-nuts-leave@lists.febo.com
>
>> To unsubscribe, go to and follow the instructions there.
>
> _______________________________________________
>
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
> send an email to time-nuts-leave@lists.febo.com
>
> To unsubscribe, go to and follow the instructions there.
>
> _______________________________________________
>
> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
> send an email to time-nuts-leave@lists.febo.com
>
> To unsubscribe, go to and follow the instructions there.
V
va2hdd@ebox.net
Wed, Mar 2, 2022 10:50 PM
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 caution when opening attachments or on clicking links from
unknown senders.
Hi Wilko:
I was not the OP, but I would be interested in the details of your
project.
Cheers
-=Bryan=-
From: Wilko Bulte wkb@xs4all.nl
Sent: March 2, 2022 10:41 AM
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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
VNCserver. Obviously LH shows herself on that desktop ;-) This whole
shebang allows running the GPSDO/OrangePi combo to run headless (i.e.
without a display), one can use any VNCclient to check on LH via the
network. Laptop, tablet, even a smartphone can be used to monitor the
GPSDO. The OrangePi has both Wlan as well as wired Ethernet options.
Hope this makes sense, I did an article for Electron, the monthly of
the Dutch VERON ham organisation. In Dutch, for obvious reasons. But
can make it available if there is interest.
Wilko
PA1WBU
On 2 Mar 2022, at 19:21, Bryan _ bpl521@outlook.com wrote:
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: va2hdd@ebox.net va2hdd@ebox.net
Sent: March 2, 2022 9:34 AM
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
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
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
send an email to time-nuts-leave@lists.febo.com
To unsubscribe, go to and follow the instructions there.
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, va2hdd@ebox.net a écrit :
> 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 caution when opening attachments or on clicking links from
>> unknown senders.
>>
>>
>> Hi Wilko:
>>
>>
>>
>> I was not the OP, but I would be interested in the details of your
>> project.
>>
>>
>>
>> Cheers
>>
>>
>>
>>
>>
>> -=Bryan=-
>>
>> ________________________________
>>
>> From: Wilko Bulte <wkb@xs4all.nl>
>>
>> Sent: March 2, 2022 10:41 AM
>>
>> To: Discussion of precise time and frequency measurement
>> <time-nuts@lists.febo.com>
>>
>> Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
>>
>>
>>
>> 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
>> VNCserver. Obviously LH shows herself on that desktop ;-) This whole
>> shebang allows running the GPSDO/OrangePi combo to run headless (i.e.
>> without a display), one can use any VNCclient to check on LH via the
>> network. Laptop, tablet, even a smartphone can be used to monitor the
>> GPSDO. The OrangePi has both Wlan as well as wired Ethernet options.
>>
>>
>>
>> Hope this makes sense, I did an article for Electron, the monthly of
>> the Dutch VERON ham organisation. In Dutch, for obvious reasons. But
>> can make it available if there is interest.
>>
>>
>>
>> Wilko
>>
>> PA1WBU
>>
>>
>>
>>> On 2 Mar 2022, at 19:21, Bryan _ <bpl521@outlook.com> wrote:
>>
>>>
>>
>>> 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: va2hdd@ebox.net <va2hdd@ebox.net>
>>
>>> Sent: March 2, 2022 9:34 AM
>>
>>> To: Discussion of precise time and frequency measurement
>>> <time-nuts@lists.febo.com>
>>
>>> Subject: [time-nuts] Re: GPSDO - GPS1300-10-1000 by RFX Ltd. UK
>>
>>>
>>
>>> 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
>>
>>>
>>
>>>
>>
>>> _______________________________________________
>>
>>> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
>>> send an email to time-nuts-leave@lists.febo.com
>>
>>> To unsubscribe, go to and follow the instructions there.
>>
>> _______________________________________________
>>
>> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
>> send an email to time-nuts-leave@lists.febo.com
>>
>> To unsubscribe, go to and follow the instructions there.
>>
>> _______________________________________________
>>
>> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe
>> send an email to time-nuts-leave@lists.febo.com
>>
>> To unsubscribe, go to and follow the instructions there.
