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	PSK31 -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-08)
		PSK31 is a (Click link for more info and facts about half-duplex) half-duplex mode of communication.
		PSK31 can often overcome interference where other voice or data methods of communicaion fail.
		PSK31 audio (A data transmission rate; the maximum amount of information (bits/second) that can be transmitted along a channel) bandwidth is very narrow (31.25 Hz), making it highly suitable for (Click link for more info and facts about low power) low power and crowded band operation.
	www.absoluteastronomy.com /encyclopedia/p/ps/psk312.htm (323 words)

	PSK31
		The inspiration of Peter Martinez, G3PLX, PSK31 means "Phase Shift Keying, 31.25 bit rate." With the advent of this new mode, many have found renewed excitement in live keyboard to keyboard conversations.
		Until recently PSK31 was known only to a handful of individuals who dabbled in digital signal processing.
		Since PSK31 started some three years ago, the plan has always been to concentrate activity starting from the bottom edge of the IARU RTTY bandplan, expanding upwards as activity increased.
	hcs.harvard.edu /~w1af/psk31.html (496 words)

	PSK31 (Site not responding. Last check: 2007-10-08)
		PSK31 (Phase Shift Keying 31 Baud) is best viewed as a "high octane" cousin of RTTY (Radio Teletype).
		The PSK31 mode was invented by Peter Martine, G3PLX, who also brought commercial SITOR mode to the hams bands as AMTOR.
		PSK31 has been embraced by the QRP (low power) community since a couple of watts and a simple wire antenna can be used to work stations throughout the United States and some DX..
	www.rarchams.org /psk31.htm (355 words)

	PSK31 - Wikipedia, the free encyclopedia
		PSK31 is not well suited for the transmission of large blocks of data.
		* PSK31 mode works well with propagation paths that preserve phase, but poorly for those that do not, such as trans polar paths.
		The radio operator uses computer software to generate and decode an audio signal containing the encodings; the encoded audio signal is used to modulate the RF carrier of a transmitter.
	en.wikipedia.org /wiki/PSK31 (426 words)

	PSK31 Info Page
		PSK31 is a form of modulation (or "mode") that offers a new and higher level of performance in conversational communications (keyboard-to-keyboard) that we "hams" (amateur radio operators) can enjoy.
		And it's been made instantly usable by all of us, due in part to the proliferation of the personal computer, and in part to the superb and generous efforts of some very talented ham/programmers.
		It's hit or miss whether any given rig is really good for PSK31, you may be surprised by some of the findings: here's more info...
	www.psk31.com (459 words)

	PSK31
		You may now operate the hamshack's HF rig in PSK31 mode using the Compaq computer located on the white desk in the shack.
		PSK31 frequencies are as follows: (20 meters seems to be the most active)
		PSK31 signals display as two parallel lines, resembling railroad tracks, in the Spectrum Window, lower window, of Digipan.
	www.w3vpr.org /AARC/psk31.html (615 words)

	PSK31 - The Friendly Mode (Site not responding. Last check: 2007-10-08)
		The author explains: "PSK31 is a new digital mode based on the RTTY mode of operation, useful for live keyboard to keyboard QSO that works at 31.25 bauds" It uses varicode character coding what gives 50wpm, suitable for QRP, and instead FSK or on/off keying uses BPSK or QPSK with a Viterbi Decoder.
		PSK31 sounds to me like a continuous warble, not a long-short "bounce" as in Pactor or a regular on-off as in Amtor.
		So it seems that PSK31 is regulated to suit an average human keyboard in-putter, and so the error-free element is not so critical as say on a bulletin board or when transferring a file.
	homepage.ntlworld.com /g4njh2/psk31.html (813 words)

	PSK31
		PSK31 was the brainchild of Peter Martinez, G3PLX.
		Up until relatively recently, PSK31 was the favorite of a small cadre of experimenters who used DSP development kits to put the mode on the air.
		PSK31 rivals the weak-signal performance of CW and it is a vast improvement over RTTY, as I discovered first hand.
	www.kwarc.org /tech/psk31.htm (2850 words)

	QRP трансивер для работы PSK31 (Site not responding. Last check: 2007-10-08)
		However, the narrow bandwidth of the PSK31 signal—31.25 Hz—makes tuning PSK31 signals somewhat more difficult than tuning SSB and CW signals, because accurate tuning to within only a few hertz is necessary for proper decoding.
		Because PSK31 reception and transmission requires a highly stable frequency control, we established a goal for drift performance of less than 5 Hz over the course of a QSO (roughly 10 minutes).
		Because PSK31 is such a robust mode, you can send a postage-stamp color photograph of yourself or an electronic 16-color QSL card about four times larger than a postage stamp in about eight minutes.
	www.cqham.ru /psk_trx.htm (4505 words)

	G3VGR's PSK31 Page
		Tuning of received PSK31 signals is accomplished by a mouse click on any one of the multiple displayed signals.
		Although the PSK31 system has no error checking and correction, the narrow bandwidth imparts a good signal to noise ratio, resulting in a quite robust system.
		This kit is basically a PSK31 "appliance", being a crystal-controlled 20 metre transceiver optimised for the PSK mode.
	homepage.ntlworld.com /david_aldridge/psk31.html (709 words)

	[No title] (Site not responding. Last check: 2007-10-08)
		PSK31 isn't new; it's been around for a few years, but no one really took much notice until Martinez developed free software that works with a PC sound card.
		PSK31 has shown itself to be a real trouper in weak-signal situations.
		"PSK31 is publicly documented and widely available, but the ARRL in late January took the additional step of specifically documenting the technical characteristics of both PACTOR II and PSK31 in a letter to the FCC.
	www.ecso.com /psk31.html (509 words)

	Arnie Coro's Dxers Unlimited, shortwave radio, science and technology news (Site not responding. Last check: 2007-10-08)
		PSK31, a digital communications mode that uses a computer connected to a transceiver and a special software program is becoming more and more popular among radio enthusiasts worldwide...
		PSK31 is a keyboard to keyboard communications mode that due to its very narrow band requirements allows the use of very narrow band receiving filters...
		Receiving PSK31 only needs that you have a radio capable of tuning to single side band signals, that is a receiver with a BFO, a computer capable of running its CPU at least at 150 megaHertz and any of the freeware programs that can be downloaded from the ham radio websites...
	www.radiohc.org /Distributions/Dxers/scripts/01-1002.html (1764 words)

	www.BUXCOMM.com A "PSK31 PRIMER" FOR THE NEW PSK USER, homepage (Site not responding. Last check: 2007-10-08)
		Operation of PSK31 is typically in USB mode, thus the actual operating frequencies will range from the lower frequency, upward by three (3) kHz.
		PSK31 is sweeping through the SWL and Amateur Radio ranks like a brushfire.
		PSK31 is the result of my belief that the present batch of "data" modes have left a gap in amateur radio operating, the gap that was previously filled by AMTOR or even traditional RTTY, in which two or more operators chat to each other on an open channel.
	www.packetradio.com /bbbb.htm (4924 words)

	Dxers Unlimited June 10, 2000 (Site not responding. Last check: 2007-10-08)
		PSK31 is also a very city dweller friendly mode, as it works using very low power ouput...
		The most popular PSK31 frequency to monitor is around 14070, again one four zero seven zero on the 20 meter band, and now 28120, that is two eight one two zero on 10 meters, is becoming very active whenever the band opens.
		On the six meter band, PSK31 operators are now monitoring 50.290, five zero two nine zero, 50.290 and there is one cuban station now on the air on that frequency, my good friend Oscar Morales Jr., CO2OJ, the Secretary General of the Cuban Amateur Radio Federation and longtime VHF enthusiast.
	www.radiohc.org /Distributions/Dxers/scripts/00-0610.html (1590 words)

	PSK31 Audio Beacon Description
		The PSK31 Audio Beacon is an easy, fun and intriguingly useful project that has evolved from an ongoing design effort to reduce the complexity of a PSK31 controller.
		With this Beacon project, however, the PSK31 modulation computations have been designed to fit into a small PIC-like microcontroller that can serve as the basis for the transmit half of a standalone PSK31 controller.
		When presented as input to a PSK31 receiving system such as DigiPan, these modulated audio tones are decoded and the programmed beacon string is displayed.
	www.njqrp.org /digitalhomebrewing/psk31beacon/beacon_description.html (1130 words)

	WAØTTN PSK31 Info
		Please understand that some of these components may be under development and might not yet be available for public download.
		This is not a PSK31 program, per se, but a free download nonetheless.
		While the PSK31 demodulators are really good at discriminating many signals within the passband, they can't do much if a nearby station is overloading your receiver.
	www.netdave.com /wa0ttn/PSK31.asp (819 words)

	Receiving and Transmitting PSK31 With Your Macintosh
		For example, on 20 meters, 14070 is the most active PSK31 frequency, tune it in any time the bad is open, and you are almost sure to hear several PSK31 stations active.
		This lets a large number of PSK31 transmissions be identified at the same time.
		For transmitting PSK31, your Mac produces audio as set by the center frequency.
	www.blackcatsystems.com /software/multimode/psk31.html (264 words)

	PSK31 (Site not responding. Last check: 2007-10-08)
		PSK31 is the result of a belief that the present batch of "data" modes have left a gap in amateur radio operating, the gap that was previously filled by AMTOR or even traditional RTTY, in which two or more operators chat to each other on an open channel.
		Modes such as packet radio, Pactor, and others, are highly complex, are unsuited to multiway conversations, and in particular, the long block lengths introduce an unacceptable delay in the processing of text such that even normal conversation is unpleasant and quick break question/answer sessions are impossible.
		It is a keyboard to keyboard mode of operation which is much narrower in bandwidth than most digital modes and in fact uses little more spectrum than a CW signal.
	www.w5bbr.com /psk31.html (174 words)

	BARTG PSK31 Award (Site not responding. Last check: 2007-10-08)
		Promoting new forms of ham radio data comms was the reason why BARTG was first formed and I am sure that BARTG's founders will be pleased to see that, forty years on, BARTG is still at the forefront of ham radio data comms.
		This award is available to licensed amateurs and SWLs on the submission of satisfactory proof of having heard/ worked 40 different countries using only the PSK31 mode.
		Contacts for this award are valid from 0001z on January 1, 1999, onwards and contacts on any amateur band are eligible.
	www.bartg.demon.co.uk /Awards/psk31.htm (402 words)

	ARRLWeb: PSK31
		PSK31 requires a standard ham station, a computer with a SoundBlaster 16 compatible card, some free software and a very simple four component circuit if you wish the computer to control TR switching.
		It is an on-line PSK31 receiver with a horizontally scrolling waterfall display.
		As with other panoramic PSK31 programs, you click your mouse on one of the lines to begin decoding the signal.
	www.arrl.org /tis/info/psk31.html (741 words)

	Modifications to the KSB2 to Improve IMD in PSK31 Transmissions
		A PSK31 idle tone is a half-cosine with peaks separated by 16 milliseconds.
		You should now be able to transmit PSK31 with an IMD of better than -30 dB at power levels of 5 watts.
		However, on PSK31 this distortion results in higher IMD and can give performance degradation similar to the original ALC circuit.
	www.elecraft.com /Apps/PSK31_KSB2_mods.htm (1039 words)

	APE
		Purpose - To encourage PSK31 operations in the field and to research and gain practical experience in the portable capabilities of the PSK31 mode, the PODXS 070 Club offers to the members the August PSK31 Expedition (APE) Award.
		The applicant for the APE Award must be a member of the PODXS 070 Club and have a current license to operate on the HF amateur bands at the time the portable expedition takes place.
		Items may also be purchased at the portable site for use by the expeditionary party, provided that major items such as radio equipment, power sources, etc. are taken away at the conclusion of the operation and not left at the site.
	www.podxs.com /html/ape.html (823 words)

	PSK31 software
		RCKRtty Is a Windows Terminal capable of working PSK31 with SCS PTC-II and DSPCOM units.
		There is a PIC based implementation of PSK31 by Clint KA7OEI, that he uses for beacons on MedFer experimentation.
		Every version can transmit 255 different varicode symbols,and map these to values in the range 0 to 255 for display as characters on the screen.This means that PSK31 is now capable of handling some of the less-often-used symbols and special accented characters that are not in the standard 128-character ASCII character set.
	www.hamradioindia.com /software/psk31.html (887 words)

	W0QL's PSK31 Web Page
		PSK31, in my opinion, is one of the neatest new modes to come out of the 1990's.
		But the real charm of PSK31 is the ability to ragchew.
		Like many hams getting on PSK31 for the first time, I had clipstrapped together an interface just to see if this mode really works.
	www.idcomm.com /personal/medwards/psk31.html (806 words)

	Soft and Hard for PSK31
		It makes use of the Qt library and is based on the PSK31 code writen by Hansi Reiser, dl9rdz and Ted Williams, wa0eir.
		Graeme Zimmer VK3GJZ has prepared a BaseBand PSK31 Decoder Module and is working in a project for a PSK31 Transceiver which uses a PIC16C877 processor to read from a standard PC keyboard and write to a 40 x 4 LCD screen that joined to his decoder a (to be designed) PSK31 Encoder Module.
		Be sure to take a look at his PSK31 interface Home Page before plounging in a expensive purchase...
	aintel.bi.ehu.es /software.html (2421 words)

	PSK31
		PSK31 is a mode that offers a new and higher level of performance in conversational communications for hams.
		All you need is a personal computer (nothing fancy), a PSK31 interface (inexpensive at www.buxcomm.com), your HF radio and some of the great, free programs that have been created by hams and for hams - and at NO COST they share it publicly.
		PSK31 has only been around a short while, but it's popularity has really grown.
	www.w7ed.com /psk31.htm (200 words)

	W1SQLPSK PSK31 (Site not responding. Last check: 2007-10-08)
		It will allow you to track up to 20 PSK31 signals at once.
		When you drag the PSK31 stream that you want to talk to over to the Receive box the program will scan the stream for the call sign of the station that you want to talk to and fill in the logbook entry with the push of a button.
		This feature can be used to find that DX station that you've been looking for or that last state for WAS.
	www.faria.net /w1sql/psk31.htm (141 words)

	Youth Tech \| Ham Radio - PSK31 (Site not responding. Last check: 2007-10-08)
		Standard HF Packet modes (Pactor, Amtor) tend to run around 300 bits/sec, but those still require a somewhat large bandwidth, requiring more power to reach farther.
		But PSK31 uses only 31Hz of bandwidth - next to nothing, compared to the 1-2+ KHz of bandwidth commonly used in HF.
		Of course, PSK31 only works at 31 bits/second, but for casual conversations, PSK31 is more than sufficient, working at over 40 words per minute (assuming 8 bit characters, 5 characters per word).
	www.youthtech.com /hamradio/psk31.htm (183 words)

	PSK31 from Foothills of NC APRS Website
		PSK31 is a form of modulation (or "mode") that offers a new and higher level of performance in conversational communications (keyboard-to-keyboard) that we as amateur radio operators can enjoy.
		Depending upon the transceiver IF bandwidth, it is possible to "see" as many as 40 to 80 PSK31 stations at one time.
		The plan for PSK31 activity has always been (since PSK31 started) to concentrate activity starting from the bottom edge of the IARU RTTY bandplan, expanding upwards as activity increased.
	webpages.charter.net /n4wyk/psk31.htm (481 words)

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