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GPS behaviour very inconsistent

Keith Maton
 

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU
Keith Maton
 

开云体育

Since I added battery backup to my GPS module at the weekend things are more consistent.?

When I apply power, the clock shows and it's normally accurate to within a few seconds. ?I put the GPS invert to off and the clock shows correct. ?I put the invert back to on and it stays correct without drifting. I've been running WSPR for over 24 hours on 30m/20m with no problems.

I'm very pleased to have been seen in VK land on 20m WSPR this afternoon.

73 Keith, G6NHU
--


On 17 May 2013, at 10:35, Keith Maton <nentecular@...> wrote:

?

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU
Tony Volpe
 

Keith,

Could you say more about the battery backup you added? What is the exact voltage on your system? How is it different to what you had before? I have not been able to get my EM-406A to operate with the new kit, but it is working fine on the old one. In my case, the clock will not appear and the kit won't start when I set USE GPS to ON. If I set the invert GPS parameter to invert (which is wrong for the GPS, the clock appears, and the kit starts and will transmit on schedule, but the clock runs fast and within a minute or two is well out of sync with real time. This corrects momentarily when the transmit cycles end and then it runs away again.

If you have found a solution, I'd be well pleased. :))

The kit works well in every other way that I have tried, but I've only been using WSPR.

Tony
G0BZB


On 20 May 2013 21:43, Keith Maton <nentecular@...> wrote:
?

Since I added battery backup to my GPS module at the weekend things are more consistent.?

When I apply power, the clock shows and it's normally accurate to within a few seconds. ?I put the GPS invert to off and the clock shows correct. ?I put the invert back to on and it stays correct without drifting. I've been running WSPR for over 24 hours on 30m/20m with no problems.

I'm very pleased to have been seen in VK land on 20m WSPR this afternoon.

73 Keith, G6NHU
--


On 17 May 2013, at 10:35, Keith Maton <nentecular@...> wrote:

?

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU
Keith Maton
 

开云体育

Tony,

I've got an adafruit GPS unit ()?which I've connected using four wires to the U2 kit: ?1pps, +V, gnd and data. ?It has the ability to run with a battery backup for quicker acquisition and ?data logging, that's the battery I added at the weekend.

As for the supply, I run with 13.8V through a heatsinked 7805 regulator onto the U2 and from there out to the GPS module.

This morning I've done some more testing - I reset the invert GPS option to OFF and power cycled the U2. ?In this configuration, the time appears within a couple of seconds of power on and it's accurate. ?It's been running for a few hours now and it's stayed accurate.

I hope that helps.

73 Keith.


On 21 May 2013, at 07:54, Tony Volpe <tony.volpe.1951@...> wrote:

?

Keith,

Could you say more about the battery backup you added? What is the exact voltage on your system? How is it different to what you had before? I have not been able to get my EM-406A to operate with the new kit, but it is working fine on the old one. In my case, the clock will not appear and the kit won't start when I set USE GPS to ON. If I set the invert GPS parameter to invert (which is wrong for the GPS, the clock appears, and the kit starts and will transmit on schedule, but the clock runs fast and within a minute or two is well out of sync with real time. This corrects momentarily when the transmit cycles end and then it runs away again.

If you have found a solution, I'd be well pleased. :))

The kit works well in every other way that I have tried, but I've only been using WSPR.

Tony
G0BZB


On 20 May 2013 21:43, Keith Maton <nentecular@...> wrote:
?

Since I added battery backup to my GPS module at the weekend things are more consistent.?

When I apply power, the clock shows and it's normally accurate to within a few seconds. ?I put the GPS invert to off and the clock shows correct. ?I put the invert back to on and it stays correct without drifting. I've been running WSPR for over 24 hours on 30m/20m with no problems.

I'm very pleased to have been seen in VK land on 20m WSPR this afternoon.

73 Keith, G6NHU
--


On 17 May 2013, at 10:35, Keith Maton <nentecular@...> wrote:

?

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU
Barry Chambers
 

开云体育

On 20/05/2013 21:43, Keith Maton wrote:
?
Since I added battery backup to my GPS module at the weekend things are more consistent.?

When I apply power, the clock shows and it's normally accurate to within a few seconds. ?I put the GPS invert to off and the clock shows correct. ?I put the invert back to on and it stays correct without drifting. I've been running WSPR for over 24 hours on 30m/20m with no problems.

I'm very pleased to have been seen in VK land on 20m WSPR this afternoon.

73 Keith, G6NHU
--


On 17 May 2013, at 10:35, Keith Maton <nentecular@...> wrote:

?

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU

Keith

which gps module are you using?

-- 

73

Barry, G8AGN
Keith Maton
 

开云体育


On 21 May 2013, at 14:37, Barry Chambers <b.chambers@...> wrote:

?

On 20/05/2013 21:43, Keith Maton wrote:
?
Since I added battery backup to my GPS module at the weekend things are more consistent.?

When I apply power, the clock shows and it's normally accurate to within a few seconds. ?I put the GPS invert to off and the clock shows correct. ?I put the invert back to on and it stays correct without drifting. I've been running WSPR for over 24 hours on 30m/20m with no problems.

I'm very pleased to have been seen in VK land on 20m WSPR this afternoon.

73 Keith, G6NHU
--


On 17 May 2013, at 10:35, Keith Maton <nentecular@...> wrote:

?

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU

Keith

which gps module are you using?

--

73

Barry, G8AGN


I've got an adafruit GPS unit ()

73 Keith, G6NHU
Hans Summers
 


It's quite entertaining that ADAfruit call it the "Ultimate GPS module".... ? and here we are playing with what *I* called the "Ultimate" QRSS kit!

73 Hans G0UPL


On Tue, May 21, 2013 at 3:00 PM, Keith Maton <nentecular@...> wrote:
?


On 21 May 2013, at 14:37, Barry Chambers <b.chambers@...> wrote:

?

On 20/05/2013 21:43, Keith Maton wrote:
?
Since I added battery backup to my GPS module at the weekend things are more consistent.?

When I apply power, the clock shows and it's normally accurate to within a few seconds. ?I put the GPS invert to off and the clock shows correct. ?I put the invert back to on and it stays correct without drifting. I've been running WSPR for over 24 hours on 30m/20m with no problems.

I'm very pleased to have been seen in VK land on 20m WSPR this afternoon.

73 Keith, G6NHU
--


On 17 May 2013, at 10:35, Keith Maton <nentecular@...> wrote:

?

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU

Keith

which gps module are you using?

--

73

Barry, G8AGN


I've got an adafruit GPS unit ()

73 Keith, G6NHU
Keith Maton
 

开云体育

I have one further update regarding the initial time setting from the GPS using the Adafruit.

If it's all powered off and I start the GPS and the U2 at the same time, the U2 will give a slightly incorrect time depending on how long it takes the GPS to lock.

So if the GPS takes six seconds to find a lock the time displayed by the U2 will be six seconds slow.

Simply inverting and re-inverting the GPS settings cause that error to be corrected.

I hope this is helpful.

73 Keith, G6NHU


On 21 May 2013, at 11:34, Keith Maton <nentecular@...> wrote:

?

Tony,


I've got an adafruit GPS unit ()?which I've connected using four wires to the U2 kit: ?1pps, +V, gnd and data. ?It has the ability to run with a battery backup for quicker acquisition and ?data logging, that's the battery I added at the weekend.

As for the supply, I run with 13.8V through a heatsinked 7805 regulator onto the U2 and from there out to the GPS module.

This morning I've done some more testing - I reset the invert GPS option to OFF and power cycled the U2. ?In this configuration, the time appears within a couple of seconds of power on and it's accurate. ?It's been running for a few hours now and it's stayed accurate.

I hope that helps.

73 Keith.


On 21 May 2013, at 07:54, Tony Volpe <tony.volpe.1951@...> wrote:

?

Keith,

Could you say more about the battery backup you added? What is the exact voltage on your system? How is it different to what you had before? I have not been able to get my EM-406A to operate with the new kit, but it is working fine on the old one. In my case, the clock will not appear and the kit won't start when I set USE GPS to ON. If I set the invert GPS parameter to invert (which is wrong for the GPS, the clock appears, and the kit starts and will transmit on schedule, but the clock runs fast and within a minute or two is well out of sync with real time. This corrects momentarily when the transmit cycles end and then it runs away again.

If you have found a solution, I'd be well pleased. :))

The kit works well in every other way that I have tried, but I've only been using WSPR.

Tony
G0BZB


On 20 May 2013 21:43, Keith Maton <nentecular@...> wrote:
?

Since I added battery backup to my GPS module at the weekend things are more consistent.?

When I apply power, the clock shows and it's normally accurate to within a few seconds. ?I put the GPS invert to off and the clock shows correct. ?I put the invert back to on and it stays correct without drifting. I've been running WSPR for over 24 hours on 30m/20m with no problems.

I'm very pleased to have been seen in VK land on 20m WSPR this afternoon.

73 Keith, G6NHU
--


On 17 May 2013, at 10:35, Keith Maton <nentecular@...> wrote:

?

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU
"David Atkins"
 

开云体育

My thanks to Tony and Phil for publishing pictures of their builds, and to everyone else, like Keith,?who has given details of their construction. All of your experiences are helping me plan my own installation.
?
?
Both of my units are currently languishing in a drawer, pending Hans' return and his words of wisdom. The U2's USP for me was that it could be portable and self-contained. I wanted the ability to set up a WSPR beacon in the middle of nowhere without having to take a load of other equipment. The U2 should work out its location, sort out its clock to WSPR standards, and start to talk. Mine have both got the location sorted, but the lack of pps functionality means that neither the location nor the timing are usable. I'm confident that we shall see a solution soon. Sadly, I have a trip to the Highlands on Wednesday that will most likely be too premature for that.
In the meantime, I have shack-bound WSPR capabilities that I can go back to using. But I was so looking forward to being portable ;-(
?
A naive question. What did the Beta-testers use that gave them success? Is there a way I can copy that?
?
Best Wishes
?
David G8XBZ
From: QRPLabs@... [mailto:QRPLabs@...] On Behalf Of Keith Maton
Sent: 26 May 2013 10:39
To: QRPLabs@...
Subject: Re: [QRPLabs] GPS behaviour very inconsistent

I have one further update regarding the initial time setting from the GPS using the Adafruit.

If it's all powered off and I start the GPS and the U2 at the same time, the U2 will give a slightly incorrect time depending on how long it takes the GPS to lock.

So if the GPS takes six seconds to find a lock the time displayed by the U2 will be six seconds slow.

Simply inverting and re-inverting the GPS settings cause that error to be corrected.

I hope this is helpful.

73 Keith, G6NHU
?
Barry Chambers
 

Afternoon All

For several weeks, I've been struggling to get my U2 kit working with a EM-406A GPS module. The problem seems to be with the 1pps signal. as the NEMA data is read correctly.

Today, I got through the post a Fastrax (Reyax) UP501 GPS module (from Taiwan via E-Bay, ???17, about 10 days delivery time). Hans lists this module on the U2 kit web pages. It requires a 3.3v supply and the modem setting is 09600,10,1,8. Hey presto! It works! I found that the "Inv GPS" setting needs to be "On". The clock keeps perfect time (as compared against my wireless clock), the Locator is set correctly and the DDS 125MHz oscillator frequency is corrected (mine is now slightly lower than 125 MHz). At present I have "Start" set at 02 and "Frame" at 04 and the U2 is on soak test on 20m WSPR with a "loop" made from two pieces of wire about 15cm long, joined by a 47R resistor.

73

Barry, G8AGN
Tony Volpe
 

Good news Barry. Delighted your new GPS works with the new kit.?

However, there is nothing wrong with the EM-406A. I've had one working with the UQRSS1 for about ten months, day in day out 24/7. It is working now with all GPS functions working correctly as designed. However, it behaves just like yours did on the UQ2.

The issue with the UQRSS2 is being caused by some different way the software in this kit works. It's a shame really, but I won't be spending another ?17 to replace a GPS that is not faulty.

Best regards


Tony G0BZB


On 31 May 2013 12:18, Barry Chambers <b.chambers@...> wrote:
Afternoon All

For several weeks, I've been struggling to get my U2 kit working with a
EM-406A GPS module. The problem seems to be with the 1pps signal. as the
NEMA data is read correctly.

Today, I got through the post a Fastrax (Reyax) ?UP501 GPS module (from
Taiwan via E-Bay, ?17, about 10 days delivery time). Hans lists this
module on the U2 kit web pages. It requires a 3.3v supply and the modem
setting is 09600,10,1,8. Hey presto! ?It works! I found that the "Inv
GPS" setting needs to be "On". The clock keeps perfect time (as compared
against my wireless clock), the Locator is set correctly and the DDS
125MHz oscillator frequency is corrected (mine is now slightly lower
than 125 MHz). At present I have "Start" set at 02 and "Frame" at 04 and
the U2 is on soak test on 20m WSPR with a "loop" made from two pieces of
wire about 15cm long, joined by a 47R resistor.

73

Barry, G8AGN


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Hans Summers
 


Tony, Barry,

I agree, the GPS is not faulty. The U2 kit does appear to be a lot more fussy about what GPS modules it will work with. Don't worry. This weekend I will have a bit of time, and I will fix the U2 software.?

When I say "fix", I'm going to make it as similar as possible to the way it worked in the U1, which everyone seems happy with!

Should be fixed soon.?

73 Hans G0UPL


On Fri, May 31, 2013 at 3:07 PM, Tony Volpe <tony.volpe.1951@...> wrote:
?

Good news Barry. Delighted your new GPS works with the new kit.?

However, there is nothing wrong with the EM-406A. I've had one working with the UQRSS1 for about ten months, day in day out 24/7. It is working now with all GPS functions working correctly as designed. However, it behaves just like yours did on the UQ2.

The issue with the UQRSS2 is being caused by some different way the software in this kit works. It's a shame really, but I won't be spending another ?17 to replace a GPS that is not faulty.

Best regards


Tony G0BZB


On 31 May 2013 12:18, Barry Chambers <b.chambers@...> wrote:
Afternoon All

For several weeks, I've been struggling to get my U2 kit working with a
EM-406A GPS module. The problem seems to be with the 1pps signal. as the
NEMA data is read correctly.

Today, I got through the post a Fastrax (Reyax) ?UP501 GPS module (from
Taiwan via E-Bay, ?17, about 10 days delivery time). Hans lists this
module on the U2 kit web pages. It requires a 3.3v supply and the modem
setting is 09600,10,1,8. Hey presto! ?It works! I found that the "Inv
GPS" setting needs to be "On". The clock keeps perfect time (as compared
against my wireless clock), the Locator is set correctly and the DDS
125MHz oscillator frequency is corrected (mine is now slightly lower
than 125 MHz). At present I have "Start" set at 02 and "Frame" at 04 and
the U2 is on soak test on 20m WSPR with a "loop" made from two pieces of
wire about 15cm long, joined by a 47R resistor.

73

Barry, G8AGN


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Tony Volpe
 

Thanks Hans.

I wasn't worried, because I know how dedicated you are to supporting these kits Hans. They are brilliant fun for what they cost. I need a new AVR anyway, being a complete arse, I stupidly shorted the 5v/9v PA pins while it was powered up..... The screen went blank and the chip now sits there getting quite warm. I'm hoping the DDS is OK, I can hear a faint 125mhz signal and an even more feint 20hhz one, so maybe it is OK. Maybe I'm too senile to be messing about with things like this.... I certainly called myself some names.

:)))

Tony BZB
Hans Summers
 


Ooops, sorry to hear that Tony :-( ? ?I have to admit to having done that before myself, too...

I hope you didn't fry the LCD... I mean, at least one of three things could be fried: DDS, chip, LCD. ?

73 Hans G0UPL


On Fri, May 31, 2013 at 3:18 PM, Tony Volpe <tony.volpe.1951@...> wrote:
?

Thanks Hans.

I wasn't worried, because I know how dedicated you are to supporting these kits Hans. They are brilliant fun for what they cost. I need a new AVR anyway, being a complete arse, I stupidly shorted the 5v/9v PA pins while it was powered up..... The screen went blank and the chip now sits there getting quite warm. I'm hoping the DDS is OK, I can hear a faint 125mhz signal and an even more feint 20hhz one, so maybe it is OK. Maybe I'm too senile to be messing about with things like this.... I certainly called myself some names.

:)))

Tony BZB
"Peter Helm"
 

开云体育

Mine does this, but never give it a thought.
?
>So as it stands, when running FSKCW (and possibly other modes), there's no stabilisation apart from the initial routine, no matter how long the >callsign is because there isn't a pause between transmissions.

All the best Peter G8AEN
?
Tony Volpe
 

Ha ha ha - LCD? I hadn't thought of that. Might be better off ordering another kit and be done with it.

:)

I'll wait for the update in the software and order then. The old UQRSS1 has stepped into the breach and is maintaining a presence on 10.140mhz.

Have a nice weekend.?

Tony BZB
Andy Cutland
 

Hi Barry,

My up501 has just arrived from taiwan and am eager not to blow this one up !

Did you place any resistors on the unit and if so what value did you use. I will be supplying the unit from a dedicated 3.3v reg supply. Am I right in thinking that pin 4 and 5 can be connected together (vdd and vdd b) ?

73's
De Andy


From: Barry Chambers
To: QRPLabs@...
Sent: Friday, May 31, 2013 12:18 PM
Subject: Re: [QRPLabs] GPS behaviour very inconsistent

Afternoon All

For several weeks, I've been struggling to get my U2 kit working with a
EM-406A GPS module. The problem seems to be with the 1pps signal. as the
NEMA data is read correctly.

Today, I got through the post a Fastrax (Reyax)? UP501 GPS module (from
Taiwan via E-Bay, ?17, about 10 days delivery time). Hans lists this
module on the U2 kit web pages. It requires a 3.3v supply and the modem
setting is 09600,10,1,8. Hey presto!? It works! I found that the "Inv
GPS" setting needs to be "On". The clock keeps perfect time (as compared
against my wireless clock), the Locator is set correctly and the DDS
125MHz oscillator frequency is corrected (mine is now slightly lower
than 125 MHz). At present I have "Start" set at 02 and "Frame" at 04 and
the U2 is on soak test on 20m WSPR with a "loop" made from two pieces of
wire about 15cm long, joined by a 47R resistor.

73

Barry, G8AGN


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"andyfoad@..."
 

Am I right in thinking that pin 4 and 5 can be connected together
(vdd and vdd b) ?
Wire the back up battery line I think it is to the 3.3vdc supply.

Then just wire the data and 1pps direct to the U2.
No pull up / down / sideways resistors - no nothing ;-)

Just make the small adjustment on the U2 menu as per Hans' website
and enjoy hassle free GPS working.

73 de Andy (UP501 user on U1/U2).
Andy Cutland
 

Thanks for the info Andy.

I think your reply is a yes to my question in that the two pins can be connected to the same voltage source.

73's
De Andy


------------------------------

On Mon, Jun 10, 2013 10:50 AM PDT andyfoad@... wrote:

Am I right in thinking that pin 4 and 5 can be connected together
(vdd and vdd b) ?
Wire the back up battery line I think it is to the 3.3vdc supply.

Then just wire the data and 1pps direct to the U2.
No pull up / down / sideways resistors - no nothing ;-)

Just make the small adjustment on the U2 menu as per Hans' website
and enjoy hassle free GPS working.

73 de Andy (UP501 user on U1/U2).
Barry Chambers
 

开云体育

On 10/06/2013 18:27, Andy Cutland wrote:
?
Hi Barry,

My up501 has just arrived from taiwan and am eager not to blow this one up !

Did you place any resistors on the unit and if so what value did you use. I will be supplying the unit from a dedicated 3.3v reg supply. Am I right in thinking that pin 4 and 5 can be connected together (vdd and vdd b) ?

73's
De Andy


From: Barry Chambers
To: QRPLabs@...
Sent: Friday, May 31, 2013 12:18 PM
Subject: Re: [QRPLabs] GPS behaviour very inconsistent

Afternoon All

For several weeks, I've been struggling to get my U2 kit working with a
EM-406A GPS module. The problem seems to be with the 1pps signal. as the
NEMA data is read correctly.

Today, I got through the post a Fastrax (Reyax)? UP501 GPS module (from
Taiwan via E-Bay, ?17, about 10 days delivery time). Hans lists this
module on the U2 kit web pages. It requires a 3.3v supply and the modem
setting is 09600,10,1,8. Hey presto!? It works! I found that the "Inv
GPS" setting needs to be "On". The clock keeps perfect time (as compared
against my wireless clock), the Locator is set correctly and the DDS
125MHz oscillator frequency is corrected (mine is now slightly lower
than 125 MHz). At present I have "Start" set at 02 and "Frame" at 04 and
the U2 is on soak test on 20m WSPR with a "loop" made from two pieces of
wire about 15cm long, joined by a 47R resistor.

73

Barry, G8AGN


------------------------------------

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? ? (Yahoo! ID required)

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Andy

I didn't use any pull-up resistors. I connected GPS pins 4 and 5 together and fed them from a 3.3v regulator ( TS2950CT-3.3, N68CA from Maplin).

GPS pin 1 was left floating.

In the U2 menu, "Inv GPS" should be set "On".

Once a 3D fix has been obtained, the clock should run correctly (including the seconds). When using the WSPR mode,? the Maidenhead location should be correct for your location and the DDS frequency should be slightly different from the default of? 125,000,000.

Hope this helps.

-- 

73

Barry, G8AGN

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