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GPS behaviour very inconsistent
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Barry Chambers
开云体育On 12/06/2013 13:15, Andy Cutland
wrote:
?Andy I would certainly place the GPS outside. An initial fix will take a few minutes or more, depending on where satellites are in your visible piece of sky. A good way to check whether a fix has been found is to set up a spurious locator using the U2 menu and then see later whether it has been corrected. -- 73 Barry, G8AGN |
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Andy Cutland
Hi Barry, Well I fired it up this morning but couldn't get anything out of it. Not sure if it was able to get a fix from where the unit is located so I will take the whole thing outside to give it a chance to see some satellites. I checked the feed voltage and that was a stable 3.3v. The earth checked out fine too so I hope all will be good once a fix is made. Here's hoping ! 73's De Andy From: Andy Cutland To: qrplabs@... Sent: Tuesday, June 11, 2013 3:31 PM Subject: Re: [QRPLabs] GPS behaviour very inconsistent
?
That's great Barry, thanks for the info. I hope to fix it up later tonight. 73"s de Andy ------------------------------ On Tue, Jun 11, 2013 6:25 AM PDT Barry Chambers wrote: >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 <b.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 >> >> >> ------------------------------------ >> >> Yahoo! Groups Links >> >> >> QRPLabs-fullfeatured@...> >> >> >> >> >> > >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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Andy Cutland
That's great Barry, thanks for the info.
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I hope to fix it up later tonight. 73"s de Andy ------------------------------ On Tue, Jun 11, 2013 6:25 AM PDT Barry Chambers wrote:
On 10/06/2013 18:27, Andy Cutland wrote:Hi Barry,Andy |
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Barry Chambers
开云体育On 10/06/2013 18:27, Andy Cutland
wrote:
? 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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Andy Cutland
Thanks for the info Andy.
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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 togetherWire the back up battery line I think it is to the 3.3vdc supply. |
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"andyfoad@..."
Am I right in thinking that pin 4 and 5 can be connected togetherWire 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). |
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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 ------------------------------------ Yahoo! Groups Links <*> To visit your group on the web, go to: ? ? <*> Your email settings: ? ? Individual Email | Traditional <*> To change settings online go to: ? ? ? ? (Yahoo! ID required) <*> To change settings via email: ? ? QRPLabs-digest@... ? ? QRPLabs-fullfeatured@... <*> To unsubscribe from this group, send an email to: ? ? QRPLabs-unsubscribe@... <*> Your use of Yahoo! Groups is subject to: ? ? |
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"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 ? |
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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:
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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 |
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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:
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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 |
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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 |
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"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
I
have one further update regarding the initial time setting from the GPS using
the Adafruit.
Sent: 26 May 2013 10:39 To: QRPLabs@... Subject: Re: [QRPLabs] GPS behaviour very inconsistent 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
? |
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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:
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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:
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Keith Maton
开云体育On 21 May 2013, at 14:37, Barry Chambers <b.chambers@...> wrote:
I've got an adafruit GPS unit () 73 Keith, G6NHU |
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Barry Chambers
开云体育On 20/05/2013 21:43, Keith Maton wrote:
?Keith which gps module are you using? -- 73 Barry, G8AGN |
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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:
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