Well,
Following my musings last time about how far not much RF can travel, I took another look at the site of W3PM here:
http://www.knology.net/~gmarcus/
This is where I found the inspiration for my WSPR beacon back here:
http://g0mgx.blogspot.co.uk/2012/05/back-to-real-homebrewing.html
So I took a look at the latest software for the project - noting that my callsign appears in the credits! - then just reprogrammed my project with the latest code after changing the appropriate bits like callsign and locator et cetera.
I then calibrated the output for an accurate 100mW - I also calculated the loss in the coax between the output and the antenna - I make that about 1dB.
So, I have 100mW or 20bBm out of the box, 1dB loss in the coax = 19dBm or about 80mW into the antenna.
Remembering that propagation conditions are quite poor at the moment, here are the results of an overnight run:
Simply stunning, egh?
Following my musings last time about how far not much RF can travel, I took another look at the site of W3PM here:
http://www.knology.net/~gmarcus/
This is where I found the inspiration for my WSPR beacon back here:
http://g0mgx.blogspot.co.uk/2012/05/back-to-real-homebrewing.html
So I took a look at the latest software for the project - noting that my callsign appears in the credits! - then just reprogrammed my project with the latest code after changing the appropriate bits like callsign and locator et cetera.
I then calibrated the output for an accurate 100mW - I also calculated the loss in the coax between the output and the antenna - I make that about 1dB.
So, I have 100mW or 20bBm out of the box, 1dB loss in the coax = 19dBm or about 80mW into the antenna.
Remembering that propagation conditions are quite poor at the moment, here are the results of an overnight run:
Simply stunning, egh?
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