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.

Excellent, managed to master Ubuntu enough to install WSJT and WSPR this afternoon.
Now up and running again at a new QTH, hope to be very active once more now I'm not tied to windoze.
Just need a good time synch for the clock.

I decided it would be fun to process all of the spots in the spot database since the beginning (March 2008) and keep track of various "records", i.e. the top 25 spots per callsign in various categories. I had to pre-process some of the data to remove duplicates and properly sort LF/MF bands (newer monthly archive files have better filters applied, but corrections were never made to older data).

New radio, need to get it cabled up.

today Sunday 6 Jan 1255
using 3 element SteppIR at 45 ft

Sorry to say that the participants in the ARRL RTTY Roundup 2013 have camped themselves all over WSPR on 20. Thats why I like the WARC bands so much.

homebuild SDR trx based on Flex1000 software: PowerSDR 2.5.3 Liniair amplifier homebuild 100W . Antennae wire dipole 2x 20m

I just finished construction of Jay Wilson's kit with the addition of a low pass filter from Kits-and-parts.
I attached the low pass board right above the WSPR-AXE board.
Broke the PC trace going to the output BNC and inserted the low pass filter.
Tomorrow I will strip the outer insulation from some RG-58 and fold back the braid to make a 1/4 wave vertical coax dipole.
I will run it up with a fiberglass surf fishing rod and get it on the air.
And will do it on the first day of a new year.

What a great kit!

Just beginning to spend some quality time setting up WSPR to receive on my old trusty Yaesu FT840. That's what extended holiday vacations are for.

After years of WSPR-ing I decided to give two meters WSPR a try.
The radio has CI-V (CAT) commands for setting frequency but not
transmit/receive. So I went into the microphone input so I could
use VOX to key the transmitter.

The 706 stock oscillator is nowhere near stable enough.
I tried the little German crystal heater but I couldn't get
the expected results. It couldn't counter the temperature
variation from the fan going full tilt during transmit.

Santa gave me a new WSPR transmitter for Christmas, the kit arrived from England well before christmas and was assembled in a few hours, since then it has been running on the bench, as I played with its many (9) different modes of operation.

Then came the task of putting it in a box and adding the finishing touches, and finally the big moment yesterday I connected it to the antenna.

What can you expect from two intergrated circuits, one a 74HC00 logic chip the other a small AT microcontroller with two 2N7000 MOSFETs as the PA, running from a 5 Volt supply pulling 110mA on transmit, the answer is 8.4volts P/P on 50 ohms, a quick calculation 175mW, increasing the PA volts (only) to 6 Volts produced the desired 9V P/P or 200mw RF output.

A quick touch up of the frequency to 10.140170MHz, selecting WSPR Mode and setting the realtime clock to UTC and into the antenna, a Vertical Moxon Rectangle (top at 30 ft reflector at 6ft) a real NVIS cloud warmer, SWR 1.2:1 and fingers crossed, where will my 200mW go.

Two and a half minutes later the answer a +10 s/n spot from VK4TMH 507km away a good start, as the afternoon progresses the reports get better VK5ZEA @ 1.817km, WA2YUN @ 5,409km, KL1X @ 11,169km, W5Olf @ 12,805, then just before bedtime several -28 s/n spots from OH8GKP @ 14,502km.(a total over 75 spots in 5 hours)

A quick final technical check, 200mW yes, the 2n7000's do run a little warm at that, but at 60 cents each that is not a worry, the realtime clock once set has kept time to better than a second (or my windows computer without help), the frequency has slowly drifted a few Hz with a 5 degree C change in ambient temperature.
(I am not at this stage using the external GPS time frequency input option provided in the software).

So we now have a viable battery powered, stand alone 200mW WSPR Beacon transmitter that works. (time to think about a small solar panel battery charger)

Usually when we talk about getting signal below noise, we imply spread spectrum. WSPR is no spread spectrum. On the universal conservation of energy perspective, spread spectrum spreading gain is no different from measuring input noise with a wide bandwidth filter and getting the signal with a narrow bandwidth (usually matched filter). WSPR belongs to the latter. So we need to estimate the real WSPR SNR with respect to the signal's noise bandwidth.

I have enjoyed my first week using WSPR and have made regular postings on the facebook group, I shall be concentrating on 2M over the Christmas period.

Merry Christmas and a Happy New year

Birmingham, UK

What's the consensus of opinion on the advantage WSPR has over, say SSB. So, suppose I can "work" a tasty DX from IO82 on 5W WSPR, what would I need to work him on SSB?

I think it's at least 15dB. Probably a lot more.

2012-12-21 23:50 RX3DHR 1.838121 -27 0 KO94ks 5 N2NOM FN22bg 7588 314

I am trying out WSPRnet, but nobody seems to be able to spot me. :-(

Recently I'm relatively active on 40m band WSPR.
I sometimes receive reports from Eu SA and VK etc.

But when receiving WSPR signal, I sometimes suffer by QRM of CW signal.
It is sending "K" and the other station is sending "M".
Does anyone know where it comes from?
I suppose it comes not from local station, because it has slight QSB.
When QRM signal is weak, I can copy many DX station though.

Anyway, I'm going to measure the precise frequency of this signal.


I have now open the pre-orders for the agile WSPR beacon with DDS signal source.
This kit will allow you to generate a WSPR signal anywhere from LF to 28MHz band...

Having replaced a blown RF transformer in the receive line of my 30 year old Trio (Kenwood) TS-130V, I decided to see just how good the receive side now is. In comparison to my more modern rigs, such as the Yaesu FT-857D, it certainly seemed to be down in sensitivity, but by how much was the question. Well, all I can say is that WSPR has been an eye-opener. From the outset I decided to keep the output power down to 1 watt to avoid any heating effects on the VFO.

I have erased the logs from the screenshot, I wonder how many watts the stations are running.... I thought WSPR was meant to be run at QRP....

After a few days of experimenting with WSPR, I can only say that I am very pleasantly surprised.

I have my rig at my workplace and mainly just on receive, as I do not have a proper outdoor antenna here - my antenna is a simple coil-loaded mobile whip antenna with a mag mount, standing indoors on the floor. Due to the lack of a proper coupling to ground, the antenna is not in tune anywhere on the ham bands. Nevertheless, I am still able to receive and decode many transmissions.