Monday, 23 March 2015

QRP, WSPR and concrete dust.

What do I do WSPR for?

To see how far I can get on low power - testing propagation at the same time. This tests my equipment and antennas as well of course. The fact that you can see how well a distant station can receive you is what I do it for.

Also, you can fit in WSPR alongside other things you are doing. In my case today it is chippping up a concrete floor, in inch-square pieces, on my hands and knees, with a chisel and a very large hammer.

Today WSPR has been about what power I needed to work Jon Ove, EA8/LA3JJ, on Fuertaventura in the Canary Islands.

At 11:44 he could receive me at +3dB when I ran one watt. So I cut it steadily to 50mW, at which stage I had fallen to -25dB. After that it dropped out and he cannot hear me now even though I am now running 200mW. Conditions change. It is 3159km from here to Jon Ove's location.

By dropping the power in this, a coupe of  was I worked Chris 4X1RF (3833km) on 1mW. That is the equivalent of 3,833,000 km per watt.

Power Reported Distance
Date Call Frequency SNR Drift Grid dBm W by loc

 2015-03-23 13:14  GM4FVM  28.126096  -21  0  IO85wu  +27  0.501  EA/LA3JJ  IL38ar 

 2015-03-23 12:28  GM4FVM  28.126096  -25  0  IO85wu  +17  0.050  EA/LA3JJ  IL38ar 

 2015-03-23 12:20  GM4FVM  28.126097  -15  0  IO85wu  +20  0.100  EA/LA3JJ  IL38ar 

 2015-03-23 12:08  GM4FVM  28.126099  -12  -1  IO85wu  +23  0.200  EA/LA3JJ  IL38ar 

 2015-03-23 11:52  GM4FVM  28.126099  -7  0  IO85wu  +30  1.000  EA/LA3JJ  IL38ar 

 2015-03-23 11:44  GM4FVM  28.126099  +3  -1  IO85wu  +30  1.000  EA/LA3JJ  IL38ar 

 2015-03-23 11:24  GM4FVM  28.126099  -2  0  IO85wu  +30  1.000  EA/LA3JJ  IL38ar 

 2015-03-23 10:54  GM4FVM  28.126099  -9  0  IO85wu  +30  1.000  EA/LA3JJ  IL38ar 

I do not intend to post here so often in future but I have a backlog!



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