K2 and FSK
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I have read the postings on the problem of having to set the AF gain as
bands are changed with FSK and PSK31 modes, and I seem to recall that I have seen a product that automates this. I believe it was a hardware device that monitored the PSK31 output and adjusted the AF level for optimum distortion level. It was independent of the rig in use, and maybe it can be used for other digital modes like FSK also - or that the idea can be adapted to other modes? Does anyone have a clue or a web-pointer to what this is? 73 Sverre LA3ZA http://www.qslnet.de/la3za/ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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Hello Sverre!
> I have read the postings on the problem of having to set the AF gain as > bands are changed with FSK and PSK31 modes, and I seem to recall that I have > seen a product that automates this... > > Does anyone have a clue or a web-pointer to what this is? PSK Meter, see <http://www.ssiserver.com/info/pskmeter/> 73, Lyle KK7P _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Sverre Holm-2
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/ de w1rt/John On 9/27/05, Sverre Holm <[hidden email]> wrote: > I have read the postings on the problem of having to set the AF gain as > bands are changed with FSK and PSK31 modes, and I seem to recall that I have > seen a product that automates this. > > I believe it was a hardware device that monitored the PSK31 output and > adjusted the AF level for optimum distortion level. It was independent of > the rig in use, and maybe it can be used for other digital modes like FSK > also - or that the idea can be adapted to other modes? > > Does anyone have a clue or a web-pointer to what this is? > > > > 73 > > Sverre > LA3ZA > http://www.qslnet.de/la3za/ > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com > Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by Sverre Holm-2
On Tue, 2005-09-27 at 18:30 +0200, Sverre Holm wrote:
> I have read the postings on the problem of having to set the AF gain as > bands are changed with FSK and PSK31 modes, and I seem to recall that I have > seen a product that automates this. > Does anyone have a clue or a web-pointer to what this is? http://www.ssiserver.com/info/pskmeter/ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by KK7P
Am 27. Sep 2005, um 09:43:12 schrieb Lyle Johnson:
Hello Lyle, > >I have read the postings on the problem of having to set the AF gain as > >bands are changed with FSK and PSK31 modes, and I seem to recall that I > >have > >seen a product that automates this... > > PSK Meter, see <http://www.ssiserver.com/info/pskmeter/> Then, there is IMD Meter at http://kk7uq.hfradio.org/index.htm Having one of these on my shopping list, but not yet decided which one I should go for, I'd be interested in first-hand reports, preferably from people who have tried both... 73s Mario -- Mario Lorenz Internet: <[hidden email]> Ham Radio: DL5MLO@OK0PKL.#BOH.CZE.EU "I hear that if you play the NT 4.0 CD backwards, you get a Satanic message!" "That's nothing. If you play it forward, it installs NT 4.0!" _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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In reply to this post by zeke7237
-----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/ _______________________________________________ Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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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/ > > > _______________________________________________ > Elecraft mailing list > Post to: [hidden email] > You must be a subscriber to post to the list. > Subscriber Info (Addr. Change, sub, unsub etc.): > http://mailman.qth.net/mailman/listinfo/elecraft > > Help: http://mailman.qth.net/subscribers.htm > Elecraft web page: http://www.elecraft.com Elecraft mailing list Post to: [hidden email] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com |
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