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1. Topband: PSK-31 (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 26 Apr 2004 07:29:59 -0500; In the recent discussion of allocations and band segmentation, someone seemed to be suggesting that PSK31 was a broadband mode. When I look at signals on my PSK31 software, they seem rather narrow ba; /archives//html/Topband/2004-04/msg00227.html (6,709 bytes)
2. FW: Topband: PSK-31 (score: 1): Author: "Jose M. Valdes R. YV5LIX" <yv5lix@cantv.net>; Date: Mon, 26 Apr 2004 19:00:46 -0000; Hello Jim. No, you are right, PSK31 signals are inherently narrow, unless the modulation stage of the radio is been overdriven, PSK31 signals width will be only about 100 Hz, when properly adjusted a; /archives//html/Topband/2004-04/msg00228.html (7,407 bytes)
3. Re: Topband: PSK-31 (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Mon, 26 Apr 2004 21:27:45 -0400; segmentation, someone When I look at band -- typically being overdriven easily get 1 kHz Jim, The problem is multiple, all rooted in the fact the PSK tone is fed into a low level audio port. First,; /archives//html/Topband/2004-04/msg00232.html (8,696 bytes)
4. Re: Topband: PSK-31 (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 26 Apr 2004 21:06:37 -0500; Thanks, Tom. That makes sense. So it really isn't any different from the massive distortion we hear during SSB contests when lousy operators (and lousy technicians) shove way too much audio from thei; /archives//html/Topband/2004-04/msg00233.html (8,040 bytes)
5. RE: Topband: PSK-31 (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Tue, 27 Apr 2004 09:22:40 -0400; Jim, Be careful when running the sound card at full output. The amplifier in many cards is marginal at full output and will generate IMD and/or other spurious outputs before the PSK (or RTTY, MFSK, e; /archives//html/Topband/2004-04/msg00236.html (7,852 bytes)
6. RE: Topband: PSK-31 (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 27 Apr 2004 16:20:56 -0500; As the old saying goes, "it depends." In this case, it depends on where the sound card clips/distorts, how much RF you might have floating around your shack, and providing immunity to hum/buzz that m; /archives//html/Topband/2004-04/msg00237.html (8,604 bytes)
7. Re: Topband: PSK-31 (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Tue, 27 Apr 2004 15:45:56 -0700; Seems like another useful thing to do would be to run your VFO low in frequency relative to the station you are trying to work so that the audio tones coming from your soundcard out are all high rela; /archives//html/Topband/2004-04/msg00238.html (8,692 bytes)
8. Re: Topband: PSK-31 (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Tue, 27 Apr 2004 18:56:45 -0400; depends on where floating might be your rig. Hi Jim, I wouldn't put any stock in the idea that a pad reduces common mode buzz or RFI. fundamental. they're at clip, impedance A -30dB spurious would b; /archives//html/Topband/2004-04/msg00240.html (8,762 bytes)
9. RE: Topband: PSK-31 (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Tue, 27 Apr 2004 19:09:39 -0400; Been there - done that too. levels. Unfortunately, PSK does not have a constant level envelope ... with the phase inversion (BPSK) it simply can't. Most sources recommend running a rig at about 6 dB; /archives//html/Topband/2004-04/msg00241.html (9,271 bytes)
10. RE: Topband: PSK-31 (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Tue, 27 Apr 2004 17:42:41 -0700 (PDT); It is entirely possible to generate PSK signal that has a constant envelope. You simply hold the amplitude constant and rotate the phase 180 degrees, instead of holding the phase constant and rampin; /archives//html/Topband/2004-04/msg00242.html (8,134 bytes)
11. Re: Topband: PSK-31 (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Tue, 27 Apr 2004 19:10:11 -0700; While its entirely possible to do what you describe, Rick, I think you pay a big bandwidth penalty when you slew the phase of the carrier while it is on. I am not entirely familiar with the PSK31 spe; /archives//html/Topband/2004-04/msg00245.html (10,158 bytes)
12. RE: Topband: PSK-31 (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 27 Apr 2004 23:17:45 -0500; Your point is well taken. I just looked at the output of the computer running full gain from the PSK software. The third harmonic (the strongest spur) is 24 dB below the fundamental. Not hard clippin; /archives//html/Topband/2004-04/msg00246.html (9,981 bytes)
13. RE: Topband: PSK-31 (score: 1): Author: "Garry Shapiro" <garry@ni6t.com>; Date: Wed, 28 Apr 2004 12:30:25 -0700; Mike: "I am not entirely familiar with the PSK31 specification, but I suspect that they are using root-raised cosine symbol shaping to minimize the occuppied bandwidth of the signal." Although I have; /archives//html/Topband/2004-04/msg00251.html (9,187 bytes)
14. RE: Topband: PSK-31 (score: 1): Author: "Rick Karlquist" <richard@karlquist.com>; Date: Wed, 28 Apr 2004 15:33:55 -0700 (PDT); You're both right. The RRC filter does limit occupied bandwidth at the transmitter and limits noise bandwidth at the receiver, and does it (as you describe) in a way that does not introduce harmful I; /archives//html/Topband/2004-04/msg00252.html (9,082 bytes)
15. Re: Topband: PSK-31 (score: 1): Author: VR2BrettGraham <vr2bg@harts.org.hk>; Date: Thu, 29 Apr 2004 00:59:08 +0000; K9YC's approach to pad the input so as to achieve better S/N into the rig is great, but as Jim noted, with all knobs at eleven, the 3rd harmonic was -24 dBc. Throttling back the sound card 3 dB broug; /archives//html/Topband/2004-04/msg00253.html (8,839 bytes)
16. RE: Topband: PSK-31 (score: 1): Author: "Tod Olson" <tod@k0to.us>; Date: Wed, 28 Apr 2004 22:28:51 -0600; Brett Any suggestions on which card(s) might be 'cleaner' than others? Tod _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mai; /archives//html/Topband/2004-04/msg00254.html (7,737 bytes)
17. Re: Topband: PSK-31 (score: 1): Author: "Michael Tope" <W4EF@dellroy.com>; Date: Wed, 28 Apr 2004 19:43:33 -0700; raised-cosine Yes, you are quite correct about the importance of the ISI issue, Gary. And as Rick points out, you can't bandlimit the PSK signal without introducing harmful ISI if you use just any ol; /archives//html/Topband/2004-04/msg00255.html (10,253 bytes)
18. RE: Topband: PSK-31 (score: 1): Author: "Joe Subich, K4IK" <k4ik@subich.com>; Date: Wed, 28 Apr 2004 22:54:33 -0400; Unfortunately, when the user of one of these cards sets up with a 100 Hz tone, turns the output up all the way, inserts an attenuator between the sound card and the radio and then increases the mic; /archives//html/Topband/2004-04/msg00256.html (9,816 bytes)
19. RE: Topband: PSK-31 (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 28 Apr 2004 22:59:44 -0500; That's -3 dB. Huh? how does 50% power turn into -10 dB? According to my math it's -3 dB. BTW, I measured the relative gain of the slider on my sound card. The first notch down from the top is 3 dB be; /archives//html/Topband/2004-04/msg00257.html (9,848 bytes)
20. RE: Topband: PSK-31 (score: 1): Author: VR2BrettGraham <vr2bg@harts.org.hk>; Date: Thu, 29 Apr 2004 06:01:46 +0000; K0TO asked (darn, how to make a slashed zero?): Any suggestions on which card(s) might be 'cleaner' than others? That might be one that audiophiles could better answer, but seeing how amateurs use co; /archives//html/Topband/2004-04/msg00258.html (8,286 bytes)

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