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.


TODAY 19.07.2017 the Ballon STELLA5 gets in the Air.
Its an jointventure with two students from Hamburg.
It is an 800g Latex ballon flying with helium.
The probe transmitts on 30m WSPR, 40m WSPR, 30m JT-9 and 2m CW.

The transmitter is an modified ULTIMATE U3s.

Waiting for hardware to arrive... Ordered a WSPRlite at sotabeams for the start. Additional LP-Filters are under construction

Chasing WSPR for this expedition. Propagation is not cooperating. . .

In a previous posting I wrote that I thought a majority of 20m WSPR stations were having their receive performance substantially reduced due to high noise levels. I suggested that even without a calibrated S-meter or signal source the balloon WSPR stations currently floating around the earth could sometimes be used to assess station performance. I tried to demonstrate some evidence that most 20m WSPR stations do not function as well as they might.

Summer opening on 160m (NA/EU path)

Unique spot list:

I am trying to receive CG3EXP, I am using WSJT-X, I can see their locator but the call sign is not decoding? just (-----) can anyone help.


Home QTH is Calgary, in western Canada, but we do spend a great deal of time during the summer in Southern Ontario - about 3000 km away

Basic setup here is Butternut HF6V vertical, and 80 m dipole fed with open wire, along with FT817 and old FT767 transceivers

Hearing virtually no DX on the air, I thought I would try WSPR with 0.5 watts from the FT-817

It took a week or so of trying to get WSPRMAP to get my location moved, but it is OK now.

I'm not even sure if I can state my question clearly enough, but here goes.

By design, the WSPR protocol has FEC which allows for a decode even though some received bits are missing.

My question is: From a time perspective, what's the minimum window of reception in order to "completely" decode the data embedded in a WSPR transmission? Or is the better question, how many bits of data (stated as a percentage of the total number of bits encoded) are required for a successful decode? I'm not seeking precision in the answer, only a ballpark idea.

Hello to all,

I'm the new electronic QSL manager for the CG3EXP WSPR expedition, and am happy to announce that the CG3EXP eQSL account is active and ready to accept your reports. CG3EXP has "AG" certification so it will also qualify for any additional eQSL awards for those requiring "AG" status eQSLs.

I'm running a QRP Labs QRSS kit on 20 meters (14.097.100). I would like to see how far it will transmit on 250mw into an end fed long wire.

This posting describes a way to gauge a 20m WSPR station’s noise floor and performance using transmissions from one of the high altitude balloons which carry WSPR around the world.

Recently by applying surface wave transmission line theory, I’ve been working to create efficient, small dipoles for the amateur LF through HF bands. Application of this theory to very small dipoles, even ones less than 1 meter tip-tip has provided very good results for amateur HF WSPR use.

From the DARC Facebook page July 5th, 2017
WSPR-Funkbake in der Antarktis

KP4MD/P is active on WSPR until July 12, 2017 from (FK68xk) Carolina, Puerto Rico, on the north shore of the island.
Radio: Elecraft KX3, 5 watts on 20, 30 and 40m.
Antenna: Buddistick monopole at 24m elevation over the Atlantic Ocean.

Possible false band reporting Problem when using Band Hopping and "Tune" Mode with latest WSJTX or JTDX.

Anyone confirm ?
73's de HB9VQQ

Going to try some low power mobile WSPR and see what happens.