vk6pop's blog

Installed WSPR 2 yesterday. So while I was at it I decided to read the instructions! What perplexes me is the Rx noise indicator. The instructions tell me to try to reduce that to as close to zero as possible using the RF gain and AF input volume to the computer. Neither adjustment makes a blind bit of difference to the Rx noise. It's always -30 Db. Never changes, apart from when in Tx mode of course.

Have I read the instructions wrongly?

Last 2 nights, WSPR has shut down around 1830z

Other times it goes through the night without a problem.

Using WSPR version 1.12_r1177. Win XP sp3.

Being sporadic makes it difficult to analyse what's going on.

The only other event on the computer at that time that I'm aware of is a scheduled scan from AVG anti virus. There's nothing in the AVG event log that indicates it has a problem with WSPR.

I won't be sitting up overnight to observe what happens, so I may never find out. :o\

My AVG anti-virus has started reporting that Dimension4 is infected with SHeur2.AZMQ Trojan Horse.

The following notice appears on the Thinking Man Software website:

AVG Antivirus recently updated their software to search for the SHeur2.AZMQ Trojan Horse. This recent AVG Antivirus update INCORRECTLY identifies Dimension 4 as being infected with this new Trojan Horse.

80 metres SAD overnight was good - several European stations, one at 0.1 watts.

The azimuth provided on the database for the European stations looks odd to me.

the map shows Short Path (which should be the default I guess), however the database show different.

for example:
Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
22:40 G3WPD 3.594072 -24 0 IO91qq 10 VK6POP OF88bd 14525 92

What is an alligator? In radio terms it's a person who is all mouth and no ears. If we apply the same idea to radio stations (not people), do we have alligators on WSPR?

On a typical overnight (midnight to 8am my time UTC+8) session on 40 metres, I will hear around 6 Europeans and a small handful of North Americans. Yet most nights I am only heard by a small few of those stations.

What does it say about a station's Rx capability (including environmental issues)? Where are the principles of reciprocity when I hear a 0.5 watt signal from 14,000 km away and my 10 watts is not heard in return?

The reciprocal principle says that, all being equal, two stations should hear each other the same, however it's clear to me that all isn't equal.

It's not sour grapes driving me to write this. I just wonder why a station with a Tx antenna good enough to make a 0.5 watt 14,000 km trip, can't receive a signal much greater in magnitude over the same distance/path. Are the paths really one-way so often?

I think I'll take an aspirin and lie down for a while - too much thinking :)


Several times in the last couple of weeks, when I have left WSPR running overnight, it has shut itself down during the night. The computer is still running, Spectran is still running, but WSPR has stopped.

I'm wondering if anyone else has noticed this happening.

Just put up a new antenna. I made it for a Field Day contest for portable operation. It's up in the trees at my place for testing and tweaking. It's a vee beam. Legs are cut for one wavelength at 40 metres. I made it after reading several websites, and settled on the document by ZS1AN at http://www.qsl.net/zs1an/weekend_antennas_2.pdf.

This wire antenna is fed with several metres of twin feed, a 4:1 air wound balun, then coax to the tuner. At the moment, SWR measurements are a bit high (as high as 4.0:1 in some places) but that should be fixed when I do the final tweaking.

This antenna works on multi bands. It's not better than my YAGI on 10,15,20, but it's a darn good antenna for good results in a portable situation.

the beam is pointing sort of towards Europe (the included angle is about 90 degrees, so the beam is not narrow). I'm using it tonight for WSPR.

This mode is amazing the way it gets through in an apparently dead or noisy band.

Last night we (Tony VK6HAM and I) were getting good results around the place on 20 metres. We decided to crank down the power - tony was able to get down to 1 watt, I couldn't get below 5. We were still getting into Europe and other places. I think I'll have to learn how to put my auto ATU a bit offside to reduce the effective output.

Today I was getting around in spite of finding my loop antenna had one of its four corners on the ground. It's been a bit windy today.

The latest:
I changed soundcards - working off a Sound Blaster now, and I tweaked the sound levels, in and out, and its performing much better, both on send and receive.

Whew! I thought I was going mad. Perhaps I am, but WSPR works!!

Hi all

Yesterday I had my first serious play with WSPR, and I couldn't get it to decode what it was hearing. I fooled around with sound devices, but that wasn't the issue. I connected to a few time servers and "synchronised" the clock. No go. I was receiving stuff, getting nice green bars on the waterfall, but had no call signs or other data coming up.

I read some of the postings here, and against what I thought was my better judgment, installed Dimension 4. Then the signals began to decode, and I was operational.