The Weak Signal Propagation Reporter Network is a group of amateur radio operators using K1JT's MEPT_JT digital mode to probe radio frequency propagation conditions using very low power (QRP/QRPp) transmissions. The software is open source, and the data collected are available to the public through this site.
modest setup
Submitted by ON3JT on Sun, 2010/01/03 - 09:48Moved house in july 2009. No antennas at the moment but I'll give it another try.
Made me an FD4 antenna. The problem is that the antenna is not installed. It is just lying on the lawn from east to west.
But it kinda works :-)
Now monitoring 30m with the preamp from the ic725 switched on and tuned with the mfj 941e.
200 µW on 80m
Submitted by DL9NEF on Sat, 2010/01/02 - 14:58I am so happy that someone picked up my 200 µW signal on 80 m! Here are the bigears:
2010-01-02 14:50 3.594008 -19 0 JN59ns 0.001 DF6MK JN68ik 188 142
2010-01-02 14:44 3.594008 -28 0 JN59ns 0.001 DF6MK JN68ik 188 142
2010-01-02 14:34 3.594008 -26 0 JN59ns 0.001 DF6MK JN68ik 188 142
2010-01-02 14:34 3.594008 -32 0 JN59ns 0.001 DH5RAE JN68pv 185 121
WSPR is so much fun - tnx de Johannes DL9NEF
GW4SDO
Submitted by OK2VWX on Fri, 2010/01/01 - 15:131508 -26 -2.2 10.140298 0 GW4SDO IO83 30 in JN89oo
Weakest S/N level detectable ?
Submitted by k1jt on Thu, 2009/12/31 - 15:52Do not be deceived by the statistics of randomly fluctuating quantities.
At signal levels close to the WSPR threshold, successive measurements of S/N will not be identical. This is a measurement issue, and is true even in the absence of actual signal fading. Upward and downward fluctuations are equally likely and will have similar magnitudes when stated as power levels. But when stated in dB, downward fluctuations will be much larger than upward ones.
Suppose the average ratio of signal to noise is 0.0015, with measurement-to-measurement fluctuations of +/-0.0010. (These are perfectly reasonable numbers for a marginal WSPR signal.) Then in dB we have
S/N (upward) = 10*log(0.0025) = -26.0 dB
S/N (average) = 10*log(0.0015) = -28.2 dB
S/N (downward) = 10*log(0.0005) = -33.0 dB
So occasionally you'll see WSPR report S/N values as low as -33 dB, because of measurement fluctuations, even if the "true" S/N was -28 dB.
WSPR with Yaesu FT-857D, drifting away?
Submitted by DG9VH on Thu, 2009/12/31 - 14:35Hi,
now starting WSPRing today for the first time and after a time of running all rx-reports show a drift of -1 of my signal. I think it could be a thermal effect on the trx (transmitting 2 minutes with 5 watts output could heat a little bit up inside of this nice trx).
Are there any known issues with this trx? Is the Yaesu FT-857D known for "running away" a little bit?
I take an eye on it.
back to 1mW after tests on 10-5-2.5mW
Submitted by ON8DC on Mon, 2009/12/28 - 23:102009-12-28 19:23 switch from 50µW to 1mW
20:36 to 10mW
20:57 to 5 mw
21:47 to 2.5mw
23:00 to 1mw
sorry I had to test with a new local station.
Erik
On8DC
New bigear and Record broken at 50µWatt DM3XRF
Submitted by ON8DC on Mon, 2009/12/28 - 09:38Last night I saw DM3XRF (new wspr menber) spotting me at 1mW with -4dB SNR. I increased my weinschel attenuator to 23dB =50µWatt.
And yes this morning I got 1 spot with-13dB SNR so plenty room to go lower..
Indeed -13dB 304 km gives 6.08 Km/µWatt. 16dB (-29dB min) room so with 2.5µW it could be possible!
Congrats Peter, but pls provide us with details off your bigear.
2009-12-28 07:50 ON8DC 3.594055 -13 0 JO21be 0.001 DM3XRF JN39pi 304 131
SDR-IQ and WSPR
Submitted by DF9CY on Mon, 2009/12/28 - 08:53After "fiddling around" with some difficulties, I have it running now. Before XMAS my SDR-IQ RX arrived from the U.S. (RFSpace company). Using the VAC(Virtual Audio Cable) software I got the AF fed into WSPR and it is running very fine now. RXwise only of course.
Anyone else is using the SDR-IQ here ??
GL es 73 de Christoph DF9CY
Fine 40m XMAS experience
Submitted by DF9CY on Mon, 2009/12/28 - 08:50The 40m low power activity on the XMAS days were fantastic. I found it almost unbelievable, of what my little Softrock_RXTX6.1 is capable TXwise with the 450mW as well as RX wise. I have a high noise level from halogen light switching PSUs here otherwise receiving could be better. Despite my antenna - which is a full size dipole for 40m - is up only about 6m, my signal was heard down in VK7 and ZL. Thanks to all for participating to the activity.
73 de Christoph DF9CY
Stopped 100µWatt test at 2009 12 26 23:00 and back to 1mW results.
Submitted by ON8DC on Sat, 2009/12/26 - 23:48final results are listed down. intresting remark "best ear" is DK5AI with 4.47Km/µW 4.4Mi Km/W. If I take into acount that his SNR is -21dB and the best could be -29dB He can theoreticly spot me with 16µW
Same excercise PA0HCK could recieve me in theory with 13µW finally ON7AN with 10µW.
2009-12-26 13:20 ON8DC 3.594069 -25 0 JO21be 0.001 ON7AN JO20ek 85 168
2009-12-26 13:00 ON8DC 3.594069 -24 0 JO21be 0.001 ON7AN JO20ek 85 168
2009-12-26 12:40 ON8DC 3.594069 -28 0 JO21be 0.001 ON7AN JO20ek 85 168
2009-12-26 12:32 ON8DC 7.040053 -25 0 JO21be 0.001 DK3SML JN49sf 443 117
2009-12-26 12:32 ON8DC 7.040055 -29 0 JO21be 0.001 G4ENZ IO81vv 445 283
2009-12-26 12:00 ON8DC 3.594069 -22 -1 JO21be 0.001 ON7AN JO20ek 85 168
2009-12-26 08:00 ON8DC 3.594074 -21 0 JO21be 0.001 DL0TUH JO43xl 471 55
2009-12-26 02:20 ON8DC 3.594077 -28 0 JO21be 0.001 DL0TUH JO43xl 471 55
2009-12-26 01:20 ON8DC 3.594073 -21 0 JO21be 0.001 DL0TUH JO43xl 471 55
Hallo YL,XYL es OM
Submitted by DL3XD on Fri, 2009/12/25 - 16:51Für weitere Informationen schaut bitte in meinem Spaces
100µ watt Best Ear PA0CHK
Submitted by ON8DC on Fri, 2009/12/25 - 09:26I had spots from PA0HCK with 1mW at SNR -10 dB and switched to 100µwatt
2009-12-25 09:20 ON8DC 3.594057 -20 0 JO21be 0.001 PA0HCK JO33ld 291 40
We have to invent new parameter µ watts /km and taking SNR into account.
Merry Christmas to all
Erik
stopped 250µW back to 1mW at 19:22
Submitted by ON8DC on Thu, 2009/12/24 - 19:24more bigears
2009-12-24 17:00 ON8DC 3.594067 -31 0 JO21be 0.001 DG6ABK JO51 476 83
2009-12-24 16:40 ON8DC 3.594055 -25 0 JO21be 0.001 PA0HCK JO33ld 291 40
2009-12-24 16:40 ON8DC 3.594084 -23 0 JO21be 0.001 DL5RBD JN69kb 667 107
2009-12-24 16:40 ON8DC 3.594051 -14 0 JO21be 0.001 DM3XRF JN39pi 304 131
2009-12-24 16:40 ON8DC 3.594070 -23 0 JO21be 0.001 PE4BAS JO33jk 309 35
2009-12-24 16:00 ON8DC 3.594056 -20 0 JO21be 0.001 PA0HCK JO33ld 291 40
propagation is down after 17:00 (dark)
Nice Xmas to every one
73's
Erik
switched from 1mW to 250 µWatt test on all bands started 15:46 searching for "Bigears!"
Submitted by ON8DC on Thu, 2009/12/24 - 16:22already spoted by "Bigears"
2009-12-24 16:00 ON8DC 3.594065 -24 0 JO21be 0.001 G3YSX IO91wg 296 273
2009-12-24 16:00 ON8DC 3.594056 -20 0 JO21be 0.001 PA0HCK JO33ld 291 40
2009-12-24 16:00 ON8DC 3.594064 -25 0 JO21be 0.001 DC4FS JO33vn 363 42
73's
Erik
First try
Submitted by DF9LJ on Wed, 2009/12/23 - 17:24I started with WSPR the first time today. Using WSPR in a virtual windows machine running on a mac.
Will use my 3 el. for 40m beaming 300 deg (W) with 10 W starting 17:05 UTC Dec. 23rd for a few hours.
For me WSPR is an exciting new approach to study shortwave propagation.
Thanks for this new facet of ham radio to K1JT.
By the way, I just received VE6AXL on 40 m 17:14 UTC great!
More "bigears" now testing 500µWatt and 250µ Watt
Submitted by ON8DC on Wed, 2009/12/23 - 12:4740m every 10min 80m every 30 min using si-570 beacon PE1NNZ/QRP2000 with attenuator
I will try tio find out their equipment.
73's
Erik
ON8DC
250µ Watt -6dBm W3DZZ
2009-12-23 12:10 ON8DC 3.594069 -21 1 JO21be 0.01 ON7AN JO20 98 143
2009-12-23 12:02 ON8DC 7.040056 -26 1 JO21be 0.01 G6YEK IO81mi 493 275
2009-12-23 11:50 ON8DC 3.594064 -16 0 JO21be 0.01 G3JKV IO91uf 308 273
2009-12-23 11:30 ON8DC 3.594066 -23 0 JO21be 0.01 G3YSX IO91wg 296 273
2009-12-23 11:02 ON8DC 7.040059 -27 0 JO21be 0.01 G6YEK IO81mi 493 275
2009-12-23 10:52 ON8DC 7.040159 -24 0 JO21be 0.01 DG0OPK JO50gq 453 95
2009-12-23 10:52 ON8DC 7.040160 -28 0 JO21be 0.01 G6YEK IO81mi 493 275
500µ watt -3dBm W3DZZ
2009-12-23 10:10 ON8DC 3.594068 -24 0 JO21be 0.01 G3YSX IO91wg 296 273
2009-12-23 10:10 ON8DC 3.594066 -25 0 JO21be 0.01 G3JKV IO91uf 308 273
2009-12-23 10:02 ON8DC 7.040062 -22 0 JO21be 0.01 DG0OPK JO50gq 453 95
first try
Submitted by G7OGX on Tue, 2009/12/22 - 20:01My first dip into wspr. usually contribute to propnet.org. will try switching to activity frequency later tonight.
WSPR 2.0 User's Guide in Russian
Submitted by k1jt on Tue, 2009/12/22 - 18:53Thanks to Vlad, UA6JD, a Russian translation of the WSPR 2.0 User's Guide is now available. A link has been placed on the WSJT/WSPR web site:
http://physics.princeton.edu/pulsar/K1JT/wspr.html
We now have translations of the WSPR 2.0 User's Guide in French, (Brazilian) Portuguese, and Russian. Translations into other languages would be very welcome; if you are interested in doing this and would like a copy of the original MS Word file in English, please let me know.
-- 73, Joe, K1JT
Snowbound!
Submitted by G4FUI on Tue, 2009/12/22 - 11:37Well here in the Northwest corner of England we are experiencing probably the first spell of very snowy weather since (by my reckoning anyway) 1996.
I think we have about seven inches (18cm) of level snow, and thankfully there hasn't been any wind to whip it up into deep drifts.
No big deal. However ... Not good for loft-mounted antennae!
There appears to be about 3 to 4 inches of snow lying on my roof.
Interestingly, over the last couple of days I have been beaconing WSPR at the 500mW level, and virtually no-one is hearing me. I haven't noticed particularly that I am hearing fewer signals, so it all seems to be the equivalent of having an attenuator in series with your feedline.
Maybe I need a few kW to melt the snow off the roof!
Actually it would be quite interesting to crank up the power gradually to find the point at which my signals are being heard again. Maybe I'll do that ...
WSPR Audio Signal Source
Submitted by W3PM on Mon, 2009/12/21 - 20:48I have documented my most recent project that allows a portable SSB QRP transceiver to transmit WSPR beacons from a portable location without a computer.
The project consists of a simple audio oscillator controlled by a Microchip 16F628 PIC that has the following capabilities:
- Internal timing or NMEA GPS timing for UTC synchronization of WSPR transmissions.
- RS232 input of the WSPR message.
- Line or microphone output.
- Symbol data output available to modulate a VXCO
- Low power consumption allowing battery operation
The documentation is located at:
http://www.knology.net/~gmarcus/
