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.

Simple WSPR Interface

I and many others believe in keeping an interface as simple as possible.

Makes things easy to repair, no RigBlasters here, or Signalinks.

Antennas at G3XBM

The attached picture shows the antennas in use at G3XBM.

OK2SAM, double spaced signal

Although I sometimes decode OK2SAM's WSPR signal, it always need to be strong...
On the attached file, OK2SAM signal is around -10 but getting no decoding. On the other hand the upper signal at 11:40z got decoded at -26 (the stronger one in the same period is 7L4IOU at -10.)
OK2SAM, if you ever read this post, please explain what kind of settings you are using to produce such a signal, resisting to WSPR decoder ! (You may also want to fix it !)


PS: you may wonder how I know it is your signal: easy you are the only one having such a signal !

28MHz MEPT with WSPR Ident back ON.

Back at the Home QTH, my MEPT is on 28.125995MHz. Hopefully near enough to the WSPR slot to produce some Spots.

Power out is 350mW Antenna 6m Vertical at ground level with radials.

Shifted duplicated spots

One more interesting thing found when exploring duplicated spots.

I can understand that sometimes noise can be interpreted as a message:

090812 1750 1 -33 1.5 7.040173 8IT/6Q9WVG 8 -1 18339 19

But I can't imagine, how noise can be interpreted absolutely identical
on different frequencies and different time:

090817 0436 8 -22 +3.3 3.594194 000AAB GQ74 47 1 11545 -49
090817 0436 2 -26 -2.1 3.594148 000AAB GQ74 47 1 11545 0

There's 5.4 seconds and 45 Hz between those noise portions...

One can found a lot of such pairs in the database.

Any idea?

73 de UT2UZ Nick

WSPR with TenTec RX320D

I found my TenTec RX320D to be a wonderful WSPR receiver. I have to set a slight offset of 27 Hz. No more drift seen after switching on than with the TS690s. It is a pity that it has no transmitter ...

DX on 40m

I often hear a VK7 on 40m ssb in the mornings here in the UK.
Very strong.

So I'm gonna leave 40m running over night until about 0600Z and see what happens.

Also...encouraged by my 80m reports, I might try 160m over the weekend too.

- Andy -

Small loop tests on 80m tonight de G0FTD

I shall be testing a 2.5m square wire loop tonight.
It is indoors, fixed to the bedroom wall.
Obviously it's a very poor 80m antenna.
Only 5 watts will be used.

My internet connection will have to go to sleep, so I will
post logs tomorrow, and make a blog entry of stations received.

Unfortunatly I have big QRM on rx :-(

73 de Andy G0FTD

Test post (ignore)


FT2000 and TX

I am using a FT2000 and have noticed that the TX power varies greatly over the 2 min cycle. The power appears to change with each change of tone. It can change from 5W down to 0.5W over the cycle.
Is anybody else using an FT2000 or has anybody else seen this.
I know that the FT2000 is very sensitive to the frequency of the audio of the input signal. (Even the type of voice).

I was WSPRing on 10m for many hours yesterday and received a few big signals, but no body received me.


Robert F5VHN

Amazing, Pipe line to Kabul on 10m during the night.

I've been having a blast recently using WSPR.

The highlight was receiving T61AA for about 2 hours AROUND MIDNIGHT on 10m. This is a path fo 5555km.
He started off around -14dB and over the 2 hours decreased to -26dB. I checked with him and he confirms that he was active that night.

Yesterday I put up a 5/8th wave vertical for 10m ready for the activity day. I was going to do 80m during the night and 10m during the day, I think I will now stay on 10m for the 24hours.

Maybe RX only , (see my 'FT2000' blog)


Robert F5VHN

WSPR reporting precision - suggested code change

WSPR is quite an interesting mode for doing certain
(scientific) experiments. Data integrity is important
when digging into a database. I have been enjoying
reception of mainly 10 MHz WSPR-signals for 10 days.

Probably the only rigid way to avoid incorrect spots
is to include a 4-bit band info into the transmitter
WSPR data stream. These bits should match with the
RX band setting in order to permit upload of the spots.
This would avoid recurrent apologies and corrections
in the database. Of course this would require a change
in the WSPR protocol and a slight software overhaul.

73, "Zaba" OH1ZAA (actively RX-ing with my OH2MZA call)

G0FTD Snippets (2) (Click read more for full story)


I currently use a 28Mhz quad loop which is taped to the spare bedroom wall indoors.

I had forgotten just how unbalanced the system can be whilst using an experimental tuner I had made for another purpose. Several years ago I made a balun for it, and it made a huge difference, both on tx and rx.

Having recently resurrected it's use for tx purposes my memory is coming back.

WSPR has only highlighted what I should have remembered.

I'll dig out my old tuner/balun config during the week, which will enable
me to use it as a mag loop for the LF bands too. Despite only being wire,it used to
work VERY well, and didn't melt with high power either ;-)


I left my WSPR beacon on for most of the day. All I got was one measley cloud of SpE, but very good signal strengths for a short time.

Having seen a fair few G stations monitoring, some just outside of ground wave
range, I was hoping to see some possible MS or aircraft scatter reception occur.

But nothing happened. However I will persevere,as these sort of tests are far

Just started

Trying WSPR for the first time today - some initial issues with Vista crashing but seems to have settled down now.

Using Microham MK II soundcard and seems to work fine - my erp is very weak as I am using a 20m mobile whip antenna on 30m, but without any radial plane - just working against the ATU in my TS570D. Reason being, my main antenna - Froce12 Sigma-5, is in bits currently awaiting replacement parts.

Hope I am doing all I should, and not doing what I shouldn't !

73, Ian GM4KLN
Rosemarkie, Nr. Inverness

About the WSPR database reliability

As I already mentionned, the WSPR DB is far too unreliable to attempt any serious propagation study or to trigger any propagation alert (ie for multi-hop E's on 10/6m)...

Here is an example among many others

As human errors will always occur anyway, I think that a better filtering is required: For example when a spotted station is obviously on another band, all the spots from this spotter should be ignored... (ie case of K1JT and others on the above example).
We really need the WSPR DB to become something serious... otherwise it is useless !


G0FTD snippets.

Locator square finally corrected.

Also I am currently using a wire loop antenna, and it's weird how
I'm being received in places that should be directly in the null of
the antenna.

73 de Andy

IC746PRO - How to get low power (<5W)

If anybody knows a simple way to get a IC746PRO to put out less than 5W - please let me know. The next step for me would be to build a precision power divider. I would really like to get it down to 1W or less.

RTTY Contest

Bad day for WSPR here in UK on 20m. RTTY contest hooligans all over 14.0956. It's all quiet again now so I'm back on 20m

I can see nostalgic reasons why some people might want to operate RTTY, but contests for this obsolete mode - WHY???

Dave M0BGR

Trials and tribulations of starting up a WSPR station (Part 3)


I now have my WSPR transmitter working. I have had several requests for the schematics so I have included them. My output power is 1/4W but I suspect if you ran a higher gain output transistor with a better output matching network, you should get at least 1/2W and possibly more. Since the two stages of the PA are the same, you could also add a third with a lower value emitter resistor and get more power. Be careful though to use a higher rated output transistor. The 2N2222A that I use won't deliver much more without blowing up. I use mine with natural air convection and I do not use a heat sink but I think I should. I just don't have one.

If you have any questions on this, please don't hesitate to ask. Good luck,

Remove the _.txt from the filename and you can get all the remaining information to complete this magnificant product.


Triple spots

That happеned during last WSPR activity period (12 August) on 40m band. Once I've noticed the following sequence:

2009-08-12 22:14 UT2UZ 7.040190 -20 0 KO50cr 2 VK8CH PH57 11836 90
2009-08-12 22:14 UT2UZ 7.040147 -8 0 KO50cr 2 VK8CH PH57 11836 90
2009-08-12 22:14 UT2UZ 7.040104 -20 0 KO50cr 2 VK8CH PH57 11836 90

The first idea, came into brains, was that something wrong is with my equipment.

However, more triple sequences were seen that day:

2009-08-12 22:26 DH5RAE 7.040051 -24 0 JN68pv 5 VK8CH PH57 13063 77
2009-08-12 22:26 DH5RAE 7.040094 -13 0 JN68pv 5 VK8CH PH57 13063 77
2009-08-12 22:26 DH5RAE 7.040137 -23 0 JN68pv 5 VK8CH PH57 13063 77

2009-08-12 22:24 VK6BN 7.040099 -25 0 OF88ac 10 VK8CH PH57 2639 39
2009-08-12 22:24 VK6BN 7.040142 -14 0 OF88ac 10 VK8CH PH57 2639 39
2009-08-12 22:24 VK6BN 7.040185 -25 0 OF88ac 10 VK8CH PH57 2639 39

Looks like small parasite modulation.

The frequency difference is equal to 43 Hz in all the cases. I have no idea, what does that number correspond to?

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