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.

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.

Thought I would post my thoughts on the kit, from Hans Summers

Recently completed the kit complete with the relay board which allow up to six bands, controlled through a simple two button interface to the 2 Line LCD display

Everything worked first time just had to tweak the 125MHz Ref frequency a little and also today adjusted the 20Mhz reference with the help of a frequency counter which now has the onboard Realtime Clock running pretty accurately,

A GPS module is yet to be added but thought I'd try it first without,

I don't know how stable or accurate my radio is on 440, but I'm TX'ing 16% on 432.3015 through a helix pointing up! Right now, and through the night. This ever been done with WSPR? Implications? Multipath? phase distortion? TNX QRZ de KB2MEN

2014 marks the centennial of the American Radio Relay League (ARRL). As part of the year long celebration, K4RCG has been authorized to operate with the ARRL HQ callsign as W1AW/4 on WSPR, JT65, JT9, and PSK-31 during "Virginia QSO Party Week". Look for me on all of the usual HF WSPR/JT/PSK freqs. JT65/JT9 and PSK-31 QSOs will be uploaded to LOTW; I will also forward all W1AW/4 WSPR spots to the ARRL but they are not uploadable to LOTW at this time. More info is available at


I am testing a 60m beacon with audio generated from a micro processor. Any information on the quality of my signal and speed of the CW at the end will be appreciated. 73 de Paul ZS6EHG

JA1KWV in Tokyo may be on the air tonight(3/14 around 2000 to 2100JST).
Please spot him.


WSPR right
So how about 40.670 MHZ band
Allowed 1 watt eirp with no licence, needed so it should be easy.
Q is?
What frequency should we use?


Only 2 JAs logged.


5 watts to 50 watts

By decision 2013-1515, issued to day 2014 march 12th in the French "Journal Officiel", all amators in France may now transmit on the MF band 472 - 479 kHz.

73 de Andy F6CNI.

The activity on 160m is always consistent from one week in particular on the period from 05:00z to sunrise. I spotted this night a new entry (W8CT). The 34th NA stations in my list.
As noted by Jim (WB5WPA) new stations come on 160m. In this respect, I welcome Jim (VE1RBR) for its recent arrival on 160m. In a few weeks he has already spotted all major European stations and even Leigh (VK2KRR). Good job, really FB station!!!
73 - Patrick

2014-03-09 05:48 RV3APM 14.097141 -23 0 KO85ru +30 0.501 WA8PGE EM89ov 7973 4954
2014-03-09 05:48 RV3APM 14.097109 -26 -1 KO85ru +30 0.501 GM4SFW IO77sn 2524 1568
2014-03-09 05:48 RV3APM 14.097132 -20 0 KO85ru +30 0.501 OE6PWD JN77rb 1799 1118

And 5W on 17m

Last night session on 2m WSPR was as follows.

Conditions on 6m are very good these days.
So, I’m going to test 2m WSPR directing VK tomorrow. (March 8th around 3:00 to 6:00z) And possibly next day. (March 9th)
Please watch and try to spot me. At the same time, I will be running 6m WSPR too.
Antenna direction is south. Power and frequency are +40dBm and 144.490530MHz respectively. Japanese stations are also welcome.


Since i have chosen the SI570 for local oscillator in mcHF i was wondering how good my implementation of the comm routines really is. After spending long time of tracking a bug with setting some specific frequencies I have found that the chip has internal mechanism that cause it to revert to factory startup frequency if error occurs in the frequency setup routine.