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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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Slow Hell with U2 and U1
"Dave"
Hello All
I am really enjoying this kit and have had great results on WSPR and other modes. From Canada on 20 meters the U2 easily Wsprs around the world and the frequency calibration is very stable and accurate to a few hertz. A tremendous project by Hans. Recently I have been confused by the differing results on Slow Hellschreiber with the new U2 when compared to my earlier U1 version. I have tried different speeds , different shifts and different frequencies ( 30 and 40 meters) and it seems to me that the print received from my U1 is more legible than the print from my U2. I would appreciate it if you could view the crop photos under VE3KCL and see if you have any ideas what settings or conditions could be causing difference in the definition of the print. I built the U2 with 3 matched bs170s and am running 5 volts to the chip and 7 to 9 volts to the PA using a 7805 for regulation . Output is from .5 watts to about 1.5 watts depending on the band and PA voltage. Idling current is 120 ma from the power supply and transmit goes to 270 to 350 ma depending on the band and antenna tuning. Antenna is a G5RV and tuned by a matchbox to about 1.2:1 Any Ideas? Dave Ve3kcl |
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Re: QRSS Arduino Shield Switches
"Mike W"
Dale, be sure the Shield does'nt get claustrophiobia.
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It seems a common problem with homebrewed equipment these days. Probably something to do with global warming or summat. :-) On 4 Jun 2013 at 18:53, w0r wrote:
Thanks Hans |
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Re: QRSS Arduino Shield Switches
"w0r"
¿ªÔÆÌåÓýThanks Hans ? I set the switches and started Argo and everything seems to work properly. Now I need to put it into an enclosure and put it on the air. ? Thanks again 73¡¯s Dale W0IR ? From: QRPLabs@... [mailto:QRPLabs@...] On Behalf Of Hans Summers
Sent: Tuesday, June 04, 2013 5:07 PM To: QRPLabs@... Subject: Re: [QRPLabs] QRSS Arduino Shield Switches ? ? ? Hi Dale ? In the sample sketch provided, two of the switches (S3, S4) set the speed: ????????????????????????????????????????? // Read the switches, to set the mode and speed? mode = digitalRead(SWITCH1) + 2 * digitalRead(SWITCH2);? ditSpeed = digitalRead(SWITCH3) + 2 * digitalRead(SWITCH4);and refer to the speed array at the front of the sketch: ?const unsigned int speeds[] = {1, 30, 60, 100};?? // Speeds for: 12wpm, QRSS3, QRSS6, QRSS10So? ? Switch 3 off, Switch 4 off: 12wpm Switch 3 on, switch 4 off: 3s dits Switch 3 off, switch 4 on: 6s dits Switch 3 on, switch 4 on: 10s dits ? Similarly for mode: ?#define MODE_NONE 0????????????????????? // Mode NONE means the Power Amplifier is disabled#define MODE_QRSS 1????????????????????? // QRSS mode (i.e. ordinary CW)#define MODE_FSKCW 2???????????????????? // FSK CW mode#define MODE_DFCW 3????????????????????? // DFCW modeSo: ? Switch 1 off, switch 2 off: OFF Switch 1 on, switch 2 off: QRSS Switch 1 off, switch 2 on: FSK/CW Switch 1 on, switch 2 on: DFCW ? 73 Hans G0UPL ? ? On Tue, Jun 4, 2013 at 8:53 PM, Dale <w0ir@...> wrote: ? Can some on tell me what the switch setting should be on the QRSS Arduino Shield. I believe I should be running the board QRSS3. ? |
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Re: QRSS Arduino Shield Switches
Hans Summers
Hi Dale In the sample sketch provided, two of the switches (S3, S4) set the speed: // Read the switches, to set the mode and speed mode = digitalRead(SWITCH1) + 2 * digitalRead(SWITCH2); ditSpeed = digitalRead(SWITCH3) + 2 * digitalRead(SWITCH4); and refer to the speed array at the front of the sketch: const unsigned int speeds[] = {1, 30, 60, 100}; // Speeds for: 12wpm, QRSS3, QRSS6, QRSS10So? Switch 3 off, Switch 4 off: 12wpm Switch 3 on, switch 4 off: 3s dits
Switch 3 off, switch 4 on: 6s dits Switch 3 on, switch 4 on: 10s dits Similarly for mode: #define MODE_NONE 0 // Mode NONE means the Power Amplifier is disabled #define MODE_QRSS 1 // QRSS mode (i.e. ordinary CW) #define MODE_FSKCW 2 // FSK CW mode #define MODE_DFCW 3 // DFCW mode So: Switch 1 off, switch 2 off: OFF Switch 1 on, switch 2 off: QRSS Switch 1 off, switch 2 on: FSK/CW
Switch 1 on, switch 2 on: DFCW 73 Hans G0UPL On Tue, Jun 4, 2013 at 8:53 PM, Dale <w0ir@...> wrote:
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