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.

QRV again with Raspberry Pi, 10mW

Hi from Landshut, JN68bm!

Since today I´m QRV again with my Raspberry Pi and 10mW (only the Pi-output)
on 10, 12, 15, 17, 20, 30 and 40m to a Cushcraft R7.

TNX to DL3RCG for his support setting up the Pi for WSPR!
Let´s see which spots are possible with this setup!

73 de Lenz,

Stop USB sound ports moving?

thought some one might know how to stop USB sound ports re-arranging themselves as devices are plugged in or removed. It is so frustrating to see them all change when an external USB devices is unplugged.

VK6 with Raspberry PI (100mW) and Hexbeam Longpath

2014-04-19 08:52 DL3RCG 21.096121 -26 0 JN68cn 0.1 VK6ZT OF78sq 13492 103
2014-04-19 08:40 DL3RCG 21.096121 -23 0 JN68cn 0.1 VK6ZT OF78sq 13492 103
Ist ist the first time that VK6ZT herad me.

Best 73 de DL3RCG

PY station reached EU for the first time in 160m wspr

No more to say for this surprising and short event of the night. Only hopes to see again Everaldo in 160m wspr
with a bit more of EU station in his log. He managed to lower power to 5w with succes :
2014-04-18 02:08 PY9MP 1.838095 -26 0 GH13dw 5 F59706 JN07th 9184 36
2014-04-18 01:58 PY9MP 1.838095 -26 0 GH13dw 5 F59706 JN07th 9184 36
2014-04-18 01:58 PY9MP 1.838095 -24 0 GH13dw 5 OZ7IT JO65df 10261 32
2014-04-18 01:42 PY9MP 1.838095 -24 0 GH13dw 5 F59706 JN07th 9184 36
2014-04-18 01:30 PY9MP 1.838095 -21 0 GH13dw 10 F59706 JN07th 9184 36
2014-04-18 01:30 PY9MP 1.838094 -25 0 GH13dw 10 PA0O JO33hg 9834 33
2014-04-18 01:30 PY9MP 1.838094 -27 0 GH13dw 10 SM6WZI JO67mp 10417 30
2014-04-18 01:18 PY9MP 1.838094 -27 0 GH13dw 10 SM6WZI JO67mp 10417 30
2014-04-18 01:18 PY9MP 1.838095 -23 0 GH13dw 10 OZ7IT JO65df 10261 32
2014-04-18 01:18 PY9MP 1.838095 -23 0 GH13dw 10 F59706 JN07th 9184 36

73, Patrick

Results of W1AW/4 WSPR Operations

Thank you to all for participating in the "QSO Party" helping to commemorate the centennial of the American Radio Relay League (ARRL). As part of the year long celebration, stations (including me, K4RCG) are being authorized to operate with the ARRL HQ callsign of W1AW/4. During the period of 9-15 April, I operated on WSPR, JT65, JT9-2, and PSK-31 during "Virginia QSO Party Week". Results:

12,000 WSPR spots
600 "Unique" WSPR spots
235 "2way" Spots in 117 Grids
360 QSOs using JT9-2/JT65/PSK-31.

I have forwarded all data to the ARRL for LoTW consideration. More info is available at

Thank you again for helping make this unique operating event a success!


6m WSPR Today

I've made 6m 2way WSPR with FR1GZ today.
This is my DX record on 6m WSPR.
In addition, I'm very happy about being heard by HS2JFW in Thailand.

2014-04-16 10:52 JH1GYE 50.294585 -17 -1 PM96mi 5 FR1GZ LG79rc 10821 249
2014-04-16 10:42 JH1GYE 50.294592 -14 -1 PM96mi 5 FR1GZ LG79rc 10821 249
2014-04-16 10:24 JH1GYE 50.294599 -10 1 PM96mi 5 FR1GZ LG79rc 10821 249
2014-04-16 10:24 JH1GYE 50.294540 -6 0 PM96mi 5 HS2JFW OK03fr 4583 247
2014-04-16 10:14 FR1GZ 50.294429 -25 0 LG79rc 20 JH1GYE PM96mi 10821 54
2014-04-16 10:06 FR1GZ 50.294429 -25 0 LG79rc 20 JH1GYE PM96mi 10821 54
2014-04-16 10:02 JH1GYE 50.294597 -9 1 PM96mi 5 FR1GZ LG79rc 10821 249
2014-04-16 09:58 FR1GZ 50.294430 -26 0 LG79rc 20 JH1GYE PM96mi 10821 54


Out of band WSPR transmissions - a gentle reminder.

Just a gentle reminder folks...

Please check the accuracy of your WSPR transmissions, I still see quite a few out of the WSPR
sub band, especially on 10Mhz.

These cause QRM to the QRSS sub band which is IMMEDIATELY below the WSPR sub band.

I think that ALL users of these modern ultra narrow band modes really should think about investing in some
decent measuring equipment before being let loose on the air.

Try properly monitoring YOUR own signals, and you might be surprised !

If you've never heard of the QRSS sub band please take a look here and see for yourself what you could cause
QRM to if your WSPR TX is slightly out.

Or for some good views of grotty WSPR signals in Europe try this:

73 de Andy

Gromit, it's time to put the wrong pants

It is almost summer, i have new antenna and i am back on 4. RX only for now, will try to
sort the TX later. Most of the old gear is down, but the OZ2M and the the IC-706 seems
to work, even the frequency is here and there, i will try my best to keep it in the
WSPR window.

My new antenna is double turnstile by G8SEQ:

The most annoying thing of the Yagi(my previous antenna) was the need to rotate every
time a station pops up or propagation path opens. With this, omni directional and horizontal
antenna i hope much better results. Here some pictures of the build and raising:

73, Chris


I seen a prediction for ducting.. I hear 432 beacons.. So, I'm QRV 432.3

Introducing the Hermes-Lite

Hello WSPR users,

I have been working on a lower cost variant of the Hermes DDC/DUC SDR which I am calling Hermes-Lite. All the details are at

I have been using WSPR/JT9/JT65 to test TX/RX. Details are on github.

The design is entirely open source and open hardware. The cost of all materials (including the BeMicro SDK board) is around $150. The FPGA firmware is a port of the Hermes RTL and is compatible enough to work with existing Hermes software. The ADC/DAC is the AD9866 12-bit integrated device intended for cable modems which I have repurposed as a 0-36 MHz transceiver. RX/TX tests of my prototype show good performance. The github site has instructions for listening to the receiver online.

I had hoped to have a more polished project before releasing, but I am starting a new job tomorrow and will have limited time for this project. Any help on this project or derivatives is welcome.



6 meter WSPR beacon

Today I will begin my 6 meter WSPR Beacon experiment using 5 watts output to a Squalo antenna at 10 feet.
Location here is EN74oh in Houghton Lake, Michigan which is north central lower peninsula of Michigan about 75 miles north of Saginaw.
73 Ken N8CGY

Windows XT and Windows 7 functioning on Ham software and older PC's.

Hello everyone

Years I used the old XP to serve me on Ham software , Power SDR, MultiPSK, MixwW 2.20,
FLDigi 1.3.15,WSPR and Bandmaster, and had it all working for the station here,
with the Kenwood TS-870 dsp, IC 706 MK2G, and recent a homebuilt SDR 1000 the HA-SDR1000,
So the adventure with Win7 64 bit ended in the incompatibility with Power SDR for the SDR 1000, I buyed 2 Dell Desktops Pentium D a 745 and a GX 620.
So the X64 option did not work afther some experiments, I desided to install the recomended Win 7 32 bits
home premium, and the SDR 1000 worked wih the powersdr software V 2.4.4 and the drver for the Soundblaster Audigy 2ZS
was last updated one, oke' the Rigcat rs232 worked on the TS870dsp , the PTT and CW remote worked at rs232,
the other programs mented, seem to work allright but i asume there wil be some struggle somewere,
now I am testing a old Medion 8088 PC with a Pentium HT on 3 Ghz ( Dual Processor) also with Win 7 32bit Home- Premium, The two DELLs are doing better,faster and better multitasking both better video cards,
But I could use two audio cards in it to do de SDR and the Digimodeprograms together working as TRX digimode.
Well Guys thats it for now.

The best wishes from Peter PA0PVL

My 160m season is now over

The daily total of 160m spots is falling rapidly. Other bands are now attractive even by night. It is time to summarize my 160m NA Rx Challenge: I logged 37 unique callsign of NA station (27 for the previous season) and here is the list with the output power:
VA3MW(1w), W1FVB(0.5w), WB5WPA(5w), VE3SWS(5w), K4RCG(5w), K9PAW(1w), K9YWO(1w), KE7A(5w), KU4XR(5w), W8AC(5w), K5DNL(5w), W3PM(1w), N2NOM(5w), N0NCO(5w), W1CK(1w), N1NCO(5w), VA3XH(5w), VA3SK(2w), KC2STA(5w), WD4ELG(5w), W3TMB(5w), KA1SX(5w), W9HAK(5w), K3PGP(1w), W3ZUP(10w), N9XG(2w), W5CGC(10w), KD2MX(5w), N1NAZ(5w), WD1S(10w), K5CGM(5w), N4AU(2w), K4PZ(5w), W8CT(5w), AK4UR(5w), N9XY(5w), N4NZM(5w).
The qrp and qrpp spirit is nicely represented by 34 stations!! A talking information, is'nt it?
My score was made possible by new entries, great conditions toward NA and some improvement of my antenna system (upgrade to the Wellbrook ALA100 HG version).I hope to do even better next season and and I know that some one have planned to improve their station to be effective.

In margin of my NA Rx Challenge, here are some events:
- 2013-08-30 21:24 ZS1LS 1.838071 -26 0 20 JF96fd F59706 JN07th 9173 , my first ZS
- 2013-10-09 02:34 W1FVB 1.838027 -26 0 0.5 FN44ej F59706 JN07th 5467, the lowest power (500mw) to cross the Atlantic
- 2013-11-29 Record night in 160m wspr "across the pond" 760 DX spots between NA and EU from 21:24z(11/28) to 08:22z(11/29).
- 2013-12-22 07:40 W1CK 1.838163 -25 0 1 DM13ie F59706 JN07th 9190, my first west coast
- 2014-01-21 19:24 VK2KRR 1.838101 -25 0 20 QF34mr JN07th F59706 16864, the only one spot to Leigh, far from the dozen of spots of year 2012
I warmly thanks George (K9PAW) who still sent me 1W and for 3 seasons with incredible regularity.
He is really an essential reference and the ONE by my number of spots and pleasure to decode at my sunrise.
Thank you to all and see you around september on 160m,..... merci beaucoup

my rugged rx loop

chimney aluminium corrugated pipe 1m large.
14cm diameter.
coupled using a T200 working as an impedance adapter. (a loop has a very low impedance)
variable capacitor 2x320pF.
I can tune it as is from 40m to 6m.
it's tuneable till LF adding a parallel capacitor, according to the required band (60, 80, 160, MF, LF).

yes, this rugged loop works in my 1st floor balcony :-)
please feel free to get a look to my spots on public WSPRNET database :-)

it's still in testing phase, and obviously I'll put the capacitor(s) and terminal plugs in a plastic waterproof box :-)

ps: as SWL it's enough for me test and tune this loop using just my ears, my radio smeter, and SpectrumLab :-)

100uW with Raspberry Pi on 40 meter.

I added an 24dB attenuator to my Raspberry Pi. Output is now 200mV over 50 ohm or 100uW. Antenna is a short G5RV, used as an inverted V, just over the top of my house. (10meter) Results are unbelievable. 911 km or 9,110,000 km/Watt.

Don’t know how to tell WSPR just running 100uW

2014-04-01 04:20 PE0MGB 7.040192 -29 -1 JO22fb 0.001 IZ3ATV JN55vk 911 141
2014-03-31 04:58 PE0MGB 7.040192 -26 0 JO22fb 0.001 GM4SFW IO77sn 836 321
2014-03-25 04:20 PE0MGB 7.040194 -31 0 JO22fb 0.001 DH5RAE JN68qv 722 116
2014-03-30 16:10 PE0MGB 7.040192 -25 0 JO22fb 0.001 G3UYN IO70lb 700 255

Anan100D SDR 100mW 20m WSPR

OK I've been using WSPR for some time but mainly with 5w. Recently I have been dropping power and seeing what I get.

Today has been incredible 100mW from Anan100D into ground mounted Butternut HF6V vertical and I get this..

2014-04-01 15:40 G0MGM 14.097138 -26 0 IO91po 0.1 WA2YUN RK39hh 12034 13
2014-04-01 17:20 G0MGM 14.097141 -27 0 IO91po 0.1 WA2YUN RK39hh 12034 13
2014-04-01 17:10 G0MGM 14.097141 -25 0 IO91po 0.1 WA2YUN RK39hh 12034 13
2014-04-01 16:32 G0MGM 14.097139 -27 0 IO91po 0.1 WA2YUN RK39hh 12034 13
2014-04-01 15:26 G0MGM 14.097138 -29 0 IO91po 0.1 WA2YUN RK39hh 12034 13

Wake Island. I cant believe that is 120340k/w


Tnx Joe K1JT for such a great mode!


Using my network analyzer to send WSPR

I was trying to control the N2PK VNA from an Arduino, when I got the idea to send WSPR with it. At less than 2mW RF output, I wasn't sure what to expect, but I did manage to get spotted up to 700km away. The credit must go to those receiving stations, they must have very good ears.

More info here:


I couldn't decode JG1KGS's signal tonight.
Only trace of aircraft reflection was seen.
Please refer the file attached.

I think the reason is that height of my antenna isn't enough.
My antenna height is only 10m. But I'm using homemade tower mounted preamplifier using 3SK97 perhaps.


10 Meters - 4 Element Wire Yagi - 1W

I built a 4 element wire Yagi for 10 meters. The Yagi was design from scratch using MMANA-GAL. It is my first attempt at design such an antenna and I was curious if it would ever come close to model in the application.

The Yagi boom length is 32 feet and I went for a balance between gain vs. front to back ratio. The Yagi is feed with window line and match with a homemade balance matching unit.

I have the Yagi up at 25 feet to clear the tree line and it is point in the NE direction. The goal was to get something up with a little gain that would improve my coverage in to Europe for the JTx modes.

A good test of the antenna would obviously be given it a try on WSPR with low power....approx. 1 watt.

Results with 1 watts have been impressive:

Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
2014-03-30 13:32 KA1GMN 28.126019 -22 0 EM12ku 1 SA6BSC JO67ts 8065 32
2014-03-30 13:32 KA1GMN 28.126002 -9 0 EM12ku 1 SWL-NOVARA JN45hk 8552 44
2014-03-30 13:32 KA1GMN 28.126003 -16 0 EM12ku 1 K5XL EM12kp 23 180
2014-03-30 13:32 KA1GMN 28.126094 -14 0 EM12ku 1 GM4WJA IO87mn 7210 36
2014-03-30 13:32 KA1GMN 28.126026 -16 0 EM12ku 1 OE1KDA JN88ed 8851 38

WSPR Development

I've received several questions recently about plans for future development of WSPR, so perhaps this is a good time for a public update.

As you probably know, WSPR is one of a group of programs all related to weak-signal communication by Amateur Radio. The other programs are WSJT, MAP65, WSPR, WSJT-X, and WSPR-X. All are described and hosted on the WSJT Home Page, , and their open source code is available at . Members of an active WSJT Developers Group are currently busy with various enhancements to the programs themselves, their documentation, and procedures for compiling and distributing them. Recently much of the new effort has been devoted to WSJT-X and MAP65.

The latest full version of WSPR, v4.0, has automated "band hopping" features and support for SoftRock and similar hardware. A few of us have been using this version recently. An open beta release will be made when the documentation is finished.

The experimental version called WSPR-X is also alive and well, although there's little reason to use it unless you wish to use the experimental WSPR-15 mode. WSPR-X does not offer band-hopping, support for I/Q audio, or various other features that are present in WSPR.

-- 73, Joe, K1JT

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