I wrote a Linux program for the PSKMeter, and AA6E re-wrote it with a
nice GUI, and I now use his. KF6VSG's site has some presentations on
what the firmware does, and what the PC software does, and I used those
and some email exchanges with George to write the Linux version.
The firmware does a number of voltage samples of its ADC which is across
the RF line, and returns the raw values. The envelope values are all
positive, so you look for a max, assume the min is the correct number of
samples away and barrel-shift the data around and then look at that 1/4
wave to see if it seems to have the right cosine shape, as determined by
a Fourier decomposition into the first 10 or so harmonics. (There is no
need for an FFT because it is really just a single unit of data.)
I heard that the firmware now does PSK63, and I suppose it just samples
twice as fast.
So, you can do anything that you can do with a very small nmber of
envelope samples, all rectified to be positive.
Leigh / WA5ZNU
On Tue, 27 Sep 2005 1:14 pm, Sverre Holm wrote:
-----Original Message-----
that's the PSKMeter .. I have one but I don't remember who I bought it
from
:)
... Google sez http://www.ssiserver.com/info/pskmeter/
--------------------------
Yes, that's the one, I got several responses, the first after 12
minutes!
For $39.35 the audio level is adjusted automatically as bands are
changed.
But only for PSK31, not for FSK as far as I can tell, but maybe with
some
other PC software it would work even for FSK?
73
Sverre
LA3ZA
http://www.qslnet.de/la3za/
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