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To : PSK31@WW.SYD.NSW.AUS.OC
De: Psk31 Digest <owner-psk31@aintel.bi.ehu.es>
Para: <psk31-digest@aintel.bi.ehu.es>
Asunto: Psk31 Digest V1 #204
Fecha: sßbado 16 de octubre de 1999 4:28
Psk31 Digest Saturday, October 16 1999 Volume 01 : Number 204
In this issue:
Re: [psk31] Filtered FM PSK31 for ClassC XMTR
[psk31] Is somebody out there on 17 today ???
See the end of the digest for information about psk31-digest
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Date: Fri, 15 Oct 1999 07:31:08 -0700
From: E T Phillips <miscphil@juno.com>
Subject: Re: [psk31] Filtered FM PSK31 for ClassC XMTR
The fact that PSK31 looks like carrier-suppressed amplitude modulation
may give some of you some good ideas.............. Ed Phillips, K6PH
On Thu, 14 Oct 1999 14:07:44 -0400 Charles Greene <cgreene@loa.com>
writes:
> At 01:31 AM 10/14/99 -0700, Steve Trapp wrote:
> You may be able to modulate, but I don't think any of us
> could demodulate it. You might try modulating the final,
> but as long as it goes through an amp, the amp has to
> be linear. The best bet, if all you want to do is to have
> a QRP PSK31 rig, is to look at one that does SSB.
> Then you have to look at the stability. I had an earlier
> comminication, which I can't find, that indicated that a
> varicap controlled transmitter did not have the requisite
> stabiliy, but that depends on the design. Look at the
> Elecraft K2 with the SSB option. It should work on
> PSK31 with an output of 5 watts very well.
>
> >Hi,
> >I would like to get an opinion of technical PSK31 users
> >regarding a way of sending PSK31 from a small QRP rig.
> >My motivation is I have wanted to make a mod to a small
> >portable transciever that would allow me to use a palmtop
> >to work the most efficient digital mode. When I saw the PSK31
> >articles in QST and QEX, the narrow bandwidth seemed like the
> >mode for a QRP signal.
> >
> >Since most of these rigs are class C and the audio modulation
> >or filtering were not possible, I was thinking of filting the
> >PSK modulation waveform to keep the sidebands down. So when
> >you want to change phase, you could send a small rounded pulse to
> >a varactor diode that would temporarily change frequency in an
> >amount calibrated to give roughly +-90 or 180 deg phase shift.
> >I made a first pass of this in Matlab, where the spectrum of
> >normal PSK31 is in green, raw phase change PSK in blue and that
> >from using a filtered FM pulse PSK in yellow, if you would like
> >to see the spectrum try: http://www.peak.org/~redsky/Fm-psk31.gif
> >I used a sine^2 shaped FM pulse, about half the symbol period long.
> >
> >Because the tuning requirements are so tight, I was thinking of
> >putting AFC or counter stabilization to the Rcvr. However, what
> >seemed more practical for a prototype is the digitally synth CW
> >transciever from Small Wonder Labs. The DDS makes the varactor
> >calibration and stability part easy. Hopefully, I can upgrade the
> >PIC uC chip controller to get an ADC and just enough processor
> >power to do some crude DSP detection and perhaps leave the varicode
> >mapping and tuning indicators upto the palmtop.
> >
> >I hope this message triggers thought on low end ways of doing
> >this neat new mode. I would greatly appreciate any practical
> >thoughts about what would be needed in a minimal camping xcvr
> >as well as detailed technical discussion of the merits of trying
> >to bandwidth limit the transmission by filtering the PSK frequency.
> >If that get's too mathematical to be of general interest, please
> >respond to me by email.
> >
> >73,
> >Steve Trapp, N4DG, redsky@peak.org
> >
> >
> >
>
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> >with a text line as follow: unsubscribe psk31 or unsubscribe
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> >
> >More instructions on PSK31 Webpage:
> http://aintel.bi.ehu.es/psk31.html
>
>++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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> >
>
>
>
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------------------------------
Date: Fri, 15 Oct 1999 21:45:16 +0300
From: es.aaw@neti.ee
Subject: [psk31] Is somebody out there on 17 today ???
Hi, all PSK-friends!
I'll be on QRV on 18.100.0 +/- QRM today for about an our starting from now
(18:45 UTC). If there will be activity - I can stay
longer.
Awaiting you there...
73! de Val, ES5AAW
Mailto:es.aaw@neti.ee
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End of Psk31 Digest V1 #204
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