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Re: WSPR TX Time Charts
"andyfoad@..."
I am watching this one with interest too.
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I have a U2 which I initially used with no GPS. I calibrated the clock frequency correctly and left the U2 on WSPR witn NO problems. After a day the U2 was transmitting correctly in each assigned time slot. BUT - if yiou switch the U2 off and then restart it (perhaps after an LPF change) then you MUST recalibrate the system clock again, because quartz xtals have a habit of not returning to their original operating frequency even after warming up. That would make the WSPR timings start to wander, e.g start at 10 seconds past the minute and getting progressively worse as time goes on (timings maybe lagging or leading). The moral of the story is ALWAYS recalibrate the systemn clock to the xtal frequency after switching off ;-) 73 de Andy --- In QRPLabs@..., "Paul KE7HR" <ke7hr@...> wrote:
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Re: GPS behaviour very inconsistent
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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Re: WSPR TX Time Charts
"Paul KE7HR"
Hans,
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I may be in error and was only thinking of when I was testing with frame of 02, so it would start as soon as possible. I do find it interesting that for the frame settings that do not come out equal into the 60 minutes, that there is a "short" interval before it resets to the start time value. That was one of the things that caused me to build the chart. Paul KE7HR --- In QRPLabs@..., Hans Summers <hans.summers@...> wrote:
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Re: GPS behaviour very inconsistent
Barry Chambers
¿ªÔÆÌåÓýOn 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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Re: WSPR TX Time Charts
Hans Summers
Hi Paul?
It's obviously not a particularly critical thing, but this one is interesting. Are you sure? I just checked in the code and I couldn't see how that would happen? I'll try to reproduce it here too!
73 Hans G0UPL |
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Re: GPS behaviour very inconsistent
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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WSPR TX Time Charts
"Paul KE7HR"
I put a series of WSPR TX time charts in the Photos section. They show the time slot for various start times and frame settings. For the 00 start time, the chart will be valid after the first hour since the transmit starts in the first available slot and that it likely to be a random time. It was easier for me to see the transmit times on a chart...
Paul KE7HR |
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DDS Oscillator spreadsheet
"Paul KE7HR"
I put a spreadsheet to help calculate the true DDS oscillator frequency in the Files section. It allows a normal operating frequency to be used instead of an out of band frequency.
Make sure that you have an adequately warmed up oscillator and receiver since you are likely measuring the offset in single or tens of Hertz only. Then your on the air transmissions can be confirmed with receiving stations of good quality. In my case there are several WSPR stations on 80 meters that have rubidium or GPS disciplined receivers. When they all agree on my frequency, I have confidence in it. Paul KE7HR in Phoenix, AZ |
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Re: GPS behaviour very inconsistent
"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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Re: GPS behaviour very inconsistent
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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Re: Slow Hell with U2 and U1
g3zjo
On 08/06/2013 14:33, Dave wrote:
would not generate different steps eg. entering a 0, 1 or 2 sometimes generated the same frequency. In the middle of the 20 step band, the 1/2 hz steps worked correctly.Yep, been there seen that. I assume the V2.0x may address this irregularity also.Yes indeed. 73 Eddie |
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Re: Slow Hell with U2 and U1
"Dave"
Hi Eddie
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Thank you for your insight into the slow Hell.. math. Trying to isolate the issue, I recently I mapped some Hell figures into the special messages mode and was pleasantly surprised to find that I could generate a letter V and letter E with pretty clear results on as little as 1 second timing. Each letter would require 25 numerical or letter inputs and then a few space inputs so it was a bit of a challenge for a dyslexic to do on graph paper and then transpose to inputs with U2 the editor. The special messages mode would allow 20.... 1/2 hertz steps..... but in my case some of the numerical entries would not generate different steps eg. entering a 0, 1 or 2 sometimes generated the same frequency. In the middle of the 20 step band, the 1/2 hz steps worked correctly. I assume the V2.0x may address this irregularity also. Thanks for the reply Dave Ve3kcl --- In QRPLabs@..., g3zjo <g3zjo@...> wrote:
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Re: Slow Hell with U2 and U1
g3zjo
On 06/06/2013 00:27, Dave wrote:
Recently I have been confused by the differing results on Slow Hellschreiber with the new U2 when compared to my earlier U1 version.Hi Dave I think you are the only person to have mentioned Hell Modes on the U2, and there have been no replies. During initial tests I abandoned the Hell Modes early on as all results I was getting were indecipherable. The frequency shifts (modulation) to produce Hell is critical. Being an FSK Mode it is suffering from the arithmetic software bug in v2.01, which is producing almost random shifts. Additionally being a 'fast' mode the bandwidth due to the transients software bug in v2.01 is excessive. Standby for the essential software release v2.0X. 73 Eddie G3ZJO |
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Re: U2 Final Voltage
"Yannick"
Hi,
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I have not checked the topology chosen by Hans for the PA and this is just for comparison. With the KD1JV ATS/MTR series of transceivers, we achieved 5W from 3 Bs170 at 12V on 20 meters CW. Power drops to around 3W at 9V. They are happy at 12V not getting hot if run to a 50 ohm load. However the are getting touchy if the impedance goes too low and keeping them at 10V makes the PA sturdier. The highest frequency achieved with the ATS/MTR is 15 meters, but I am not sure this limit comes from a restriction in the PA. Overall this is more a design choice and the main limit being the power consumption of the DDS in receive mode. These are rigs to bring in SOTA expedition and must be small and use as little as possible power from batteries. I repeat this if is for CW and I guess for continuous transmission I would not go above 1W. Last thing, the ATS/MTR series use a MSP430 micro-controller. I have started to modify KD1JV code to turn the MTR into a QRSS beacon. However it is such a good transceiver and buying one is so hard that I finally built my own QRSS/WSPR DDS beacon design... 73, Yan. --- Yannick DEVOS - XV4Y --- In QRPLabs@..., "andyfoad@..." <andyfoad@...> wrote:
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Re: U2 Final Voltage
"Paul KE7HR"
Thanks, Dave. I have a bag of BS170 and don't see marks to identify the maker... I put a heatsink on for good measure and also a variable PA supply separate from the supply that feeds the board. Now everything runs quite cool, even at the full 12 volts. I have reduced the output to 1 watt (20 vpp into 50 ohms) and it should now run ice cold even with high duty cycle.
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I ran a test from 5 volts up to almost 12 volts (the variable supply needs 1.5 volts or so for regulation) and built a chart. The result is in the Files section, if anyone wants to look at the output vs. supply voltage for 80 meters. The output was sent to a dummy load and the voltage across the load was measured with an oscilloscope. I also put several photos in the KE7HR folder that show the U2 in a box with a homebuilt heatsink. It is just about ready for the backpack... KE7HR Paul in Phoenix, AZ --- In QRPLabs@..., "Dave" <airdry@...> wrote:
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Re: U2 Final Voltage
"andyfoad@..."
Has anyone tried running 3 x BS170's at 12v yet AND measured the
output at 28Mhz please ? (Please note, if you have nit used 28Mhz yet then you might need to tweek the blue DDS pot to get it started.) I run a full house of BS170's at 9v @ 28MHZ and get 260mw. 73 de Andy G0FTD |
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Re: U2 Final Voltage
"Dave"
Sorry that should be 830 mw max dissipation on the bs180 to-92
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Dave --- In QRPLabs@..., "Paul KE7HR" <ke7hr@...> wrote:
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Re: U2 Final Voltage
"Dave"
Paul
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I was running a matched set of 3 Fairchild transistors and they are rated for 830 ma max and can take quite a bit of heat max 150c which should put over 2 watts out. I am using a small wattmeter and with 9 volts to the pa I can get 1.2 watts out on 30m Dave --- In QRPLabs@..., "Paul KE7HR" <ke7hr@...> wrote:
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U2 Final Voltage
"Paul KE7HR"
My U2 was putting just over 12 volts peak to peak into 50 ohms on 80 meters using a 5 volt final drive (LM2596 switching regulator) with one final. I installed the other two finals and only got an increase of 1 volt peak to peak (about 60 mW increase). I put the full battery voltage to the finals (12.6 volts) and now get just over 30 volts peak to peak or about 2.25 watts. Since the BS170 is only rated at 350 mW I will next start cutting down the voltage to the finals with another regulator to get the power down to about 1 watt.
What are others with the three finals running for voltages? I have run a couple of nights with the 12 volts final voltage on WSPR with the devices touching a nice big piece of aluminum. A better, field portable, type of heat sink will be worked out... For other modes with 100% transmit, I would really not recommend pushing the devices this hard. Screen shots from the oscilloscope of the voltages into 50 ohms in the photos section. KE7HR |
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