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.

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,

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.

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

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

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'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.

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 !

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:

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

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.

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

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:

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 :-)

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

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..

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.


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