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Latest RX:
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HF 20m, 14.230 MHz
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VHF 2m, 144.500 MHz
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HF 40m, 7.058 MHz
                           
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UHF 70cm, 433.400 MHz (& Gateway)
dSSTV (2)
HF 40m, 7.058 MHz
                           
 

WSPR "whisper" mode
Weak Signal Propagation Reporter



Beacon on 2m 144.489.00 MHz USB

Incredible distances reached with a few watts !
Software: WSJT-X v1.6.0

RX and TX spots can be seen on the website wsprnet.org




The WSPR protocol.
A message normally consist of a standard callsign, a 4-character grid locator, and the power level in dBm (decibels relative to 1 milliwatt). This information is compressed into 50 binary digits and then encoded using a convolutional code with constraint length K= 32 and rate r= 1/2. Each of the resulting 162 bits is used as the most significant bit of a two-bit channel symbol to be transmitted using 4-tone frequency-shift keying at 1.46 baud. The least significant bit is defined by a pseudo-random sequence known to the software at both transmitter and receiver and used to establish accurate synchronization of time and frequency. Convolutional codes with long constraint lengths have the important advantage that undetected decoding errors are rare. These codes are too complex to be decoded with the well-known and highly efficient Viterbi algorithm, so the WSPR decoder uses the so-called sequential algorithm, instead.

Protocol specification

* Standard message: callsign + 4-digit locator + dBm (e.g., K1ABC FN20 37)
* Messages with a compound callsign and/or 6-digit locator use a two-transmission sequence. The first transmission carries compound callsign and power level, or standard callsign, 4-digit locator, and power level; the second transmission carries a hashed callsign, 6-digit locator, and power level. Add-on prefixes can be up to three alphanumeric characters; add-on suffixes can be a single letter or one or two digits.
* Standard message components after lossless compression: 28 bits for callsign, 15 for locator, 7 for power level, 50 bits total.
* Forward error correction (FEC): non-recursive convolutional code with constraint length K=32, rate r=1/2.
* Number of binary channel symbols: nsym = (50+K-1) * 2 = 162.[2]
* Keying rate: 12000/8192 = 1.4648 baud.
* Modulation: continuous phase 4-FSK, tone separation 1.4648 Hz.
* Occupied bandwidth: about 6Hz
* Synchronization: 162-bit pseudo-random sync vector.
* Data structure: each channel symbol conveys one sync bit (LSB) and one data bit (MSB).
* Duration of transmission: 162 * 8192/12000 = 110.6 s.
* Transmissions nominally start one second into an even UTC minute: e.g., at hh:00:01, hh:02:01, etc.
* Minimum S/N for reception: around 28 dB on the WSJT scale (2500Hz reference bandwidth).


Unique reporters (TX PD3ADN), 13 mrt - 20 mrt 2016 Power Reported Distance
Date Call Frequency SNR Drift Grid dBm W
by loc km mi
 2016-03-20 12:20  PD3ADN  144.490541  +12  1  JO22cb  +40  10.000  PB0AHX  JO22ea  12  7 
 2016-03-20 09:34  PD3ADN  144.490457  -19  -4  JO22cb  +40  10.000  PA3ARK  JO33lf  226  140 
 2016-03-19 23:58  PD3ADN  144.490563  -19  2  JO22cb  +40  10.000  PA2GP  JO33hb  198  123 
 2016-03-19 20:38  PD3ADN  144.490545  -8  2  JO22cb  +40  10.000  PD5HW  JO22xu  148  92 
 2016-03-19 19:36  PD3ADN  144.490582  -19  0  JO22cb  +40  10.000  PD0SBS/P  JO33le  224  139 
 2016-03-18 23:28  PD3ADN  144.490548  -24  -4  JO22cb  +40  10.000  DL5MDN  JO32px  232  144 
 2016-03-18 09:40  PD3ADN  144.490453  -21  1  JO22cb  +40  10.000  PA0KNW  JO33md  226  140 
 2016-03-17 23:58  PD3ADN  144.490486  -25  3  JO22cb  +40  10.000  PA4GB  JO33ik  227  141 
 2016-03-17 21:42  PD3ADN  144.490487  -22  1  JO22cb  +40  10.000  PE7FG  JO32lh  190  118 
 2016-03-17 21:42  PD3ADN  144.490506  -9  3  JO22cb  +40  10.000  PA3BHW  JO32hq  178  111 
 2016-03-17 21:42  PD3ADN  144.490465  -26  2  JO22cb  +40  10.000  PD0ME  JO32kx  207  129 
 2016-03-17 14:26  PD3ADN  144.490487  +0  1  JO22cb  +40  10.000  PA4JB  JO22fb  17  11 
 2016-03-17 12:34  PD3ADN  144.490564  -27  0  JO22cb  +40  10.000  PD4U  JO22xe  120  75 
 2016-03-16 12:08  PD3ADN  144.490504  -26  1  JO22cb  +40  10.000  PD0PNQ  JO21fo  54  34 
 2016-03-14 19:40  PD3ADN  144.490592  -14  1  JO22cb  +40  10.000  PA3MET  JO22ma  57  35 
 2016-03-14 19:40  PD3ADN  144.490609  -13  3  JO22cb  +40  10.000  PA1RAB  JO22of  71  44 
 2016-03-14 19:40  PD3ADN  144.490525  +8  1  JO22cb  +40  10.000  REVSPACE  JO22eb  11  7 
 2016-03-14 18:42  PD3ADN  144.490588  -16  1  JO22cb  +40  10.000  PD0SBS  JO33le  224  139 
 2016-03-14 14:24  PD3ADN  144.490587  -15  -3  JO22cb  +40  10.000  PD9FJ  JO22ec  12  7 
 2016-03-14 00:16  PD3ADN  144.490585  +2  1  JO22cb  +40  10.000  PA5K  JO22ca  5  3 
 2016-03-13 21:36  PD3ADN  144.490555  -25  0  JO22cb  +40  10.000  PD2MT  JO22nc  63  39 



Unique RX spots by PD3ADN, 13 mrt - 20 mrt 2016 Power Reported Distance
Date Call Frequency SNR Drift Grid dBm W by loc km mi
 2016-03-20 12:24  PB0AHX  144.490501  +19  2  JO22ea  +37  5.012  PD3ADN  JO22cb  12  7 
 2016-03-17 09:02  PA3ARK  144.490518  -15  1  JO33lf  +30  1.000  PD3ADN  JO22cb  226  140 
 2016-03-16 12:40  PD0ME  144.490485  -22  0  JO32kx  +43  19.953  PD3ADN  JO22cb  207  129 
 2016-03-16 10:14  PD0PNQ  144.490494  -27  -2  JO21fo  +27  0.501  PD3ADN  JO22cb  54  34 
 2016-03-16 09:28  PA2GP  144.490498  -27  0  JO33hb  +33  1.995  PD3ADN  JO22cb  198  123 
 2016-03-16 03:54  PD0JX  144.490481  -28  3  JO21wx  +40  10.000  PD3ADN  JO22cb  114  71 
 2016-03-15 10:18  PA4JB  144.490604  -2  -4  JO22fb  +43  19.953  PD3ADN  JO22cb  17  11 
 2016-03-15 07:24  PD9FJ  144.490489  -9  2  JO22ec  +37  5.012  PD3ADN  JO22cb  12  7 
 2016-03-15 05:44  PD4U  144.490517  -20  4  JO22xe  +43  19.953  PD3ADN  JO22cb  120  75 
 2016-03-14 22:36  PE2TV  144.490508  -25  -4  JO32gh  +37  5.012  PD3ADN  JO22cb  161  100 
 2016-03-14 19:54  PA1RAB  144.490474  -21  -3  JO22of  +33  1.995  PD3ADN  JO22cb  71  44 
 2016-03-14 19:32  PD0SBS  144.490488  -28  0  JO33le  +33  1.995  PD3ADN  JO22cb  224  139 
 2016-03-14 17:42  PA3MET  144.490471  -22  -3  JO22ma  +33  1.995  PD3ADN  JO22cb  57  35 
 2016-03-14 00:00  PA5K  144.490446  +12  0  JO22ca  +37  5.012  PD3ADN  JO22cb  8  5 
 2016-03-13 18:10  PD2MT  144.490534  -19  3  JO22nc  +37  5.012  PD3ADN  JO22cb  63  39 

Latest APRS track:


QTH Loosduinen (Base)
Locator: JO22cb
CQ Zone: 14
ITU Zone: 27


QTH Zoetermeer
Locator: JO22gb



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SSTV 20m 14.230 MHz HAM


 

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