Talbot Andrew wrote: Has anyone looked at what Signal to Noise is realistically viewable on a spectrogram display ? Assuming bandwidth equal to FFT bin size, my few tests suggest around 10dB but it w
Hi Alberto, You may not need to. There's hope for us low ERP guys yet, it seems that one just needs to go slower and slower. What about 300 second dots or 1000 second dots for VK and ZL? 73, John, G
[snip] More seriously, we can go on inventing new signalling methods and alphabets ad-infinitum. But we'll always come up against Shannon's law eventually. There is an absolutely fundamental limit t
Laurie and Larry Many congratulations on an incredible achievement. Congratulations also from me. It is an incentive to dig faster for the buried radials, and to burn some more Mosfets trying to buil
Hi Rich, Just a wild guess : Could the "DV-AQ" sequence have been G3AQ, where G was corrupted to D and V- was 3 ? Don't know if Laurie (G3AQC) was on yesyerday. 73, Rik ON7YD Hi Rik, this message of
When removing jitter from a signal that's accurate over the long term, we can do better than just averaging. By letting a counter run (e.g. from the oscillator we're trying to discipline) and latchi
Oh! That's bad news. I checked the Laipac data sheet and the 1PPS accuracy is +/-1 microsecond - about 20 times worse than the UT+... It's good enough to be used as a bit clock but probably not good
Another alternative is Motorola Oncore UT+ which was designed specifically for timing applications. It has a "Site Survey" function which, if started, calculates the average of 10000 position measur
[snip] tks Alberto/I2PHD for the new argo with all the tricks ! do you need any support what ever ? [snip] Uwe, I would need an help to dig in my back garden for the ground radials of my future 137
[snip] So, if possible, stay above 2kHz, then you don't even need a sine wave. [snip] Well, if you use a perfect square wave, this requirement can be relaxed a bit, as a perfect square wave has only
[snip] The colours got fnargled when the screens were captured (anyone know a fix for that?), but the characters are still plainly visible; maybe others can recognize other senders or themselves in
[snip] PS : I will eventually make a 'beta version' that uses the soundcard, but don't blame me it your PC 'hangs' if QRS is used in combination with other software. [snip] Argo uses only the input
Hi All, On testing I found that to see the image it is necessary to copy (or type) the address www.g4cnn.f2s.com/amradbeacon.jpg into the URL field, for some reason only part of this functions if yo
[snip] The lack of finer vertical scaling in Argo is the one minor deficiency in this otherwise excellent package. [snip] John and the group, as an ad-interim way to read the frequency with 0.1 reso
[snip] Alberto, in my self interest I would prefer you also don't go out and play in the traffic either. [snip] Uhhh, Larry... I will follow your suggestion, in *my* interest :-) !!! 73 Alberto I2PH
[snip] One suggestion, can we have more frequency ticks, please. When in 90s mode the screen is about 1Hz high but the ticks are no better than 1Hz. Ticks at 0.1Hz would be useful. [snip] Mike, than
Hello all, I have just uploaded Argo beta 1 build 119. These are the changes, from the readme file : Beta 1, build 119 (Feb. 3rd 2001) - 90s dots mode now enabled - Automatic save and restore of the
Might I suggest that Alberto does development work, such as amplitude measurement, on Spectran, which already has this uncalibrated facility. Having said that I find that the improvements so far made
Andy, thanks for your suggestion. As a matter of fact I am already using your algorithm ! I use it to compute the brightness levels for the spectrogram, but only when AGC is on. So, with AGC on, the
I don't understand why the measured level will vary with the total input - surely provided the A/D converter is not overloaded, the signal component being displayed should only be proportional to the
