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.

After looking at the WSPR database over many months I wonder.

Why do so many VK stations feel they must run high power on WSPR?

Look at the database for any band and most of the stations running double figures in power are VK's.

Is it because they can't read:

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.

Is it because we don't understand the terms, Weak Signal Propagation or QRP/QRPp

This is just a quick post to document an improvement on the AVR based audio source I posted a few weeks ago. My main concern was the quantization noise introduced by the very cheap and cheerful 4-bit R-2R ladder. My solution was to throw in a 2nd AVR (ATMEGA168P, at $6.50 it's not a big deal) and program it to be a delta-sigma DAC.

I recently fired up an old Pentium III motherboard to support an ISA GPIB controller.
The fastest ISA board I have is 800 MHz. (If you've priced a PCI bus GPIB controller,
you will understand my interest in an ISA bus motherboard.)

I downloaded the WSPR source code and compiled it under Fedora 16.
It actually ran. However, the CPU utilization was rather high.
One time I observed WSJT skipping a decode because it had to make a
transmission.

I was hoping I could run WSPR on the old box but it looks like GPIB
will be its function.

I've been trying for some time to get my SDR-IQ to decode 2 different modes at the same time using the 2 channel stereo demod in SpectraVue. Finally got it working today. For awhile I had it somewhat working and I could send the audio from two different frequencies (on the same band) to 2 different programs (wspr/psk/jt65a) but the audio was always mixed which made WSPR decoding a nightmare with jt65 or psk signals mixed in.

This weekend I put the DDS based WSPR standalone beacon to schematic and PCB.

I sent it off to the PCB mfr today.
It is 80 x 60mm .

It can also function as a GPS locked timebase for any radio.
In this case, WSPR is not enabled and the PCB programmed to output on the frequency of your radios reference.

I am using the AD9859 (10 bit) ($15) but it can also use the AD9954 (14 bit)($45).
In practice, the performance is very similar.

The pcb prototype should be back to be in mid December.

glen vk1xx

I will use WSPR mainly on 2m and 6m band. Horizontal on 2m and vertical on 6m.

TEST

The screenshot attached shows me getting a lot more spots than others around me (~16 Vs 1 to ~5). I'm using an honest 5W into a 1/2 wave vertical about 8m above ground and am somewhat amazed by its performance.

Without knowing the setups of the other operators it's hard to compare but my fairly modest (ok, probably not modest for a city block) setup can't possibly be the best that's running right now.

Hi Folks, as you would be aware, as the sunspot numbers rise and solar flux etc, the chances of signals passing on the 6m band increase.
We down in Australia have quite a good following on 6m WSPR with operators showing up on the map from different parts of the country.
We really would like to see some more stations on 6m WSPR from specific locations at the moment, particularly those with yagi antennas, but an omni will do if thats all thats available. Even if you can only listen and not TX that is still a good help.

Have been decoding W4MO on various freqs. with audio harmonics, one signal and 8 harmonics. He has no contact info on QRZ. CAN ANYONE FORWARD THIS INFO? cu Jack N8ABY

I rarely operate on 10m SSB, tonight (16th Nov) I thought I would give it a go and share a few voice signals into Europe, Russia via the big Optibeam OB17-4 yagi.
I also gave mention to WSPR weak signal digital mode a few times to some of the hundreds of operators calling in the pile up, maybe some may come and have a look into WSPR now.

Rig :FT-450D
Tuner: :MFJ-929
Antenna :Slinky dipole in attic facing 045/135. Dipole is made with 2 Slinkys on either side stretched to 15 feet on each side.
Interface :SignalLink-USB

I installed the antenna today and unboxed and set up the station now that we have returned to the house after fire damage repair.

Hi!

My IC-706 has ptt problem in WSPR with CAT CI-V control although CI-V ptt is enabled. PTT works ok with other softwares like HRD. WSPR changes frequency ok, so the CAT seems to communicate. Probably the WSPR software has commmon ptt bug for these Icom models? The WSPR dos window tells when trying ptt the IC706:

'set_ptt: error = feature not available'

Alas, the IC706 menu does not allow use x6A address for CI-V CAT so I can not trick it to work with WSPR as another Icom model! Anyone solved this IC706 CI-V ptt WSPR problem?

73, - Juha -

This is a question to the WSPRnet community especially to K1JT.

Is it possible to measure the transmitting distance between a transmitter and receiver using the WSPR technique?

I've attached a distance vs. UTC plot of my 500mW WSPR signal on 10m for a 24 hour period. Interesting how it shows how the band opens and closes to different geographic locations. My signal is unheard on 10m from 0200-1400, begins to be heard in both NA and EU at 1400, EU drops off by 1800, East Africa lingers and Oceania picks up and stays to 0200. Also interesting to note that I'm not being heard by anyone closer that 1600 miles.

73 de AC7SM (Larry)

http://www.facebook.com/groups/WSPRmode/

http://goo.gl/BIQNE a drawing

http://goo.gl/KA5BA a photo

http://goo.gl/Mmh1P a 20M TX @ 5 Watts Spot database from Magloop

As I live in a high density suburb I try to keep a low profile.
I just use coax. inner sliding in one end of a tube as the tuning capacitor, as 5 Watts doesn't generate a high voltage.

2011-11-09 17:04 K4MOG 28.126114 -7 0 EM73qw 0.01 F5OIH JN06ci 6994 51
2011-11-09 17:18 K4MOG 28.126114 -10 0 EM73qw 0.01 F5OIH JN06ci 6994 51
2011-11-09 17:00 K4MOG 28.126114 -11 0 EM73qw 0.01 F5OIH JN06ci 6994 51
2011-11-09 17:24 K4MOG 28.126114 -7 0 EM73qw 0.01 F5OIH JN06ci 6994 51
2011-11-09 17:02 K4MOG 28.126114 -8 0 EM73qw 0.01 F5OIH JN06ci 6994 51
2011-11-09 17:14 K4MOG 28.126113 -8 0 EM73qw 0.01 F5OIH JN06ci 6994 51

Just put up a new 10m antenna: a converted "Station Master" 27MHz CB antenna. It's just an end fed half wave aluminium pole with a homebrew matching unit.

The matching unit is just a 13 turn autotransformer wound on some 15mm PCV pipe and tapped at turn 4 (ish). The parallel tuning capacitor is ~15cm of RG58.

The first WSPR Tx gave a lot of spots:

2011-11-09 00:30 VK2MEV 28.126030 -25 0 QF57ua 10 N6GN CM88ok 11861 55
2011-11-09 00:30 VK2MEV 28.126048 -25 0 QF57ua 10 WA7HL DM51ck 12558 66
2011-11-09 00:30 VK2MEV 28.126024 -21 0 QF57ua 10 KF7O DN06tb 12568 49
2011-11-09 00:30 VK2MEV 28.126052 -22 0 QF57ua 10 ZL1JA RE66ir 2155 128
2011-11-09 00:30 VK2MEV 28.126041 -19 0 QF57ua 10 VK2XN/2 QF59ar 340 332
2011-11-09 00:30 VK2MEV 28.126052 -4 0 QF57ua 10 N7GLS CN85qo 12249 48
2011-11-09 00:30 VK2MEV 28.126030 -18 0 QF57ua 10 K6PZB CM88nk 11855 55
2011-11-09 00:30 VK2MEV 28.126044 -18 0 QF57ua 10 W5CGC EM13ka 13722 70
2011-11-09 00:30 VK2MEV 28.126030 -24 0 QF57ua 10 VE6OG DO33 13220 43
2011-11-09 00:30 VK2MEV 28.126009 -18 0 QF57ua 10 KO6SY DM14ka 12074 61
2011-11-09 00:30 VK2MEV 28.126014 -22 0 QF57ua 10 W1MNK EL87uv 14863 81
2011-11-09 00:30 VK2MEV 28.126044 -9 0 QF57ua 10 N7KJW DM43au 12492 63
2011-11-09 00:30 VK2MEV 28.126020 -18 0 QF57ua 10 VK4ZBV QG62ml 620 12
2011-11-09 00:30 VK2MEV 28.126041 -4 0 QF57ua 10 AC0NM DM12jt 12004 62

No complaints there! Those -4dB spots to the US are very encouraging :).

Attached is the current version of my AVR WSPR audio source code. It's written and tested on an ATMEGA8L running at 4MHz but thanks to AVR's fairly general architecture it should compile and work on a large number of AVRs.

2011-11-07 19:48 W1BW 10.140239 -11 0 FN42hl 0.1 F5OIH JN06ci 5504 59
2011-11-07 20:08 W1BW 10.140238 -16 0 FN42hl 0.1 F5OIH JN06ci 5504 59
2011-11-07 19:28 W1BW 10.140242 -16 -1 FN42hl 0.1 F5OIH JN06ci 5504 59
2011-11-07 20:00 W1BW 10.140238 -17 0 FN42hl 0.1 F5OIH JN06ci 5504 59
2011-11-06 23:50 G3XIZ 1.838102 -21 0 IO92ub 0.2 F5OIH JN06ci 636 177
2011-11-07 02:36 G3XIZ 1.838102 -22 0 IO92ub 0.2 F5OIH JN06ci 636 177

Hi All,

Enclosed the log for station below 0.1 w received at home

2011-11-05 09:54 PD0RLX 14.097092 +7 0 JO11sl 0.02 F5OIH JN06ci 620 204
2011-11-05 09:56 PD0RLX 14.097092 +9 0 JO11sl 0.02 F5OIH JN06ci 620 204
2011-11-05 09:58 PD0RLX 14.097091 +9 0 JO11sl 0.02 F5OIH JN06ci 620 204
2011-11-05 10:00 PD0RLX 14.097090 +8 0 JO11sl 0.02 F5OIH JN06ci 620 204
2011-11-05 08:26 RV3APM 14.097121 -26 -1 KO86rt 0.05 F5OIH JN06ci 2780 261
2011-11-05 08:34 RV3APM 14.097113 -24 -1 KO86rt 0.05 F5OIH JN06ci 2780 261

73 de Vincent

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