Alberto, why not mix the wanted spectrum slice down to DC (I/Q) and then decimate the signal down to a very low FS and compute a no-so-giant complex-input FFT? Is there any advantage of making a huge
Hi Pete, an older version of WSPR was able to generate the data. I don't know if it is still available but there is an alternative. You can use the following program from K1JT to generate the WSPR sy
This is *extremely* amazing! Shannon et al. were right, of course, narrow BW and plenty of patience pays off in the end ;-) I wonder what could be accomplished in the "dark hole" (~6.5kHz) between th
M0FMT wrote 2010-10-12 14:35: As far as I know, the basic WSPR protocol does not allow more than the first four locator characters although the latest WSPR software for PC has a checkbox named "Force
Andy, here's another nice program for all-pass I/Q filter design: http://www.tonnesoftware.com/quad.html 73 Johan SM6LKM -- Andy Talbot wrote 2010-11-06 14:59:
Ken, you will find TANT136.exe, mentioned by Hans-Albrecht, at http://www.zerobeat.net/G4FGQ/ Also look for "solnoid3" which is another program written by the late Reg G4FGQ. It is a very accurate pr
The web site http://www.ua4wpf.nm.ru/ contains malicious material and is not safe to visit according to F-Secure Browsing Protection. 73 Johan SM6LKM Dmitry wrote 2010-12-04 17:26:
Hi Alberto, there are two different links on your page http://www.weaksignals.com/ The link "Download Jason V0.99" points to jaspak_v099b.exe and the screenshot picture points to jaspak_v099.exe. Acc
I measured the input impedance of the mic input on a Dell laptop: AC input impedance: 4.3 kOhms (-6dB with 4k3 resistor in series) Mic bias voltage: +3.8V (open circuit) Output current: 809uA (shorte
Yes Mal, and Farad is another "someones name". CENTIMETRES is the proper unit for capacitance which can be measured with a ruler and it is easy to scale to other units of length, for example yards, i
It WAS necessary: http://www.winforce.org.uk/MMARS/g2fum-6.htm Click the link "his original 1938 Artificial Aerial Licence" and then click the three licence pages for full size. Interesting reading..
Andy, the last two pages of http://www.cs.berkeley.edu/~culler/AIIT/papers/radio/Sokal%20AACD5-poweramps.pdf is a nice and simple guide to the "two dimensional" tuning of the class E amplifier. The t
That number is recognised by an OM in SM as well. It was the line frequency of the old U.K. 405-line TV system ;-) 73 Johan SM6LKM -- Julian Hardstone wrote 2011-02-09 21:11:
Interesting thoughts... I had a vague, and probably wrong, memory that the electron density of the ionosphere had a maximum around 300km so I placed the outer sphere at that altitude and calculated "
Alberto, I'd suggest that you try to get images from *both* EPROMs to avoid the mess of having two program halves with different versions :-) 73 Johan SM6LKM
