psk-31 presentation 06.pptx [read-only] · what does it sound like? each signal sounds like a...
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PSKPSK--3131Dave, K6AIX Dave, K6AIX ddanner@earthlink.netddanner@earthlink.net
© 01© 01--2121--2007, D. H. Danner2007, D. H. Danner 11
What is PSKWhat is PSK--3131 ??
�� Digital Digital
�� Text , ASCIIText , ASCII
�� Narrow Bandwidth, PSK, 31 HzNarrow Bandwidth, PSK, 31 Hz
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�� Low Power, < 25 wattsLow Power, < 25 watts
�� Out Performs Teletype, PacketOut Performs Teletype, Packet
�� Low Cost, Simple to UseLow Cost, Simple to Use
The Normal SSB SignalThe Normal SSB Signal
3000 Hz
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Average Noise
3000 Hz
Bandwidth Bandwidth vrsvrs Signal to NoiseSignal to Noise
�� Narrow receiver bandwidth removes Narrow receiver bandwidth removes unwanted noise.unwanted noise.
Increased “signalIncreased “signal--toto--noise ratio”noise ratio”
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�� Increased “signalIncreased “signal--toto--noise ratio”noise ratio”
Average Noise
31 Hz
Why Use PSKWhy Use PSK--31 ?31 ?
�� Usable well into the noiseUsable well into the noise
�� Use available radio and any computerUse available radio and any computer
�� Use low power and normal antennaUse low power and normal antenna
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�� Use low power and normal antennaUse low power and normal antenna
�� Uses very little bandwidthUses very little bandwidth
�� Free software on internetFree software on internet
�� All bands and satelliteAll bands and satellite
�� Simple operation, simple setSimple operation, simple set--upup
Simple SetSimple Set--Up.Up.
�� Uses Standard SoundcardUses Standard Soundcard
Antenna
Transceiver ComputerSound Card
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Transceiver ComputerCardSpkr
Mic
PTT
What Kind of Signal ?What Kind of Signal ?
�� PSKPSK--31 uses special CW characters31 uses special CW characters
�� Most used letters use shortest codesMost used letters use shortest codes
�� Lower case letters type fasterLower case letters type faster
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�� Lower case letters type fasterLower case letters type faster
�� Frequency shift keying (FSK) usedFrequency shift keying (FSK) used
�� Only about Only about ±± 15 cycles bandwidth15 cycles bandwidth
�� About 3 characters per secondAbout 3 characters per second
What does it sound like?What does it sound like?
�� Each signal sounds like a single toneEach signal sounds like a single tone
�� The tone warbles The tone warbles ±± 15 cycles15 cycles
�� Your SSB receiver can receive many Your SSB receiver can receive many
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�� Your SSB receiver can receive many Your SSB receiver can receive many PSKPSK--31 stations all at the same time31 stations all at the same time
�� You hear all the stations at once.You hear all the stations at once.
�� Your computer picks out the station you Your computer picks out the station you wish to workwish to work
Set and Forget your RadioSet and Forget your Radio
�� Set your radio to the established frequency, Set your radio to the established frequency, a fixed a fixed -- lock your diallock your dial
�� Use Upper Sideband, Use Upper Sideband, SSB onlySSB only
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�� Use Upper Sideband, Use Upper Sideband, SSB onlySSB only
�� Turn Turn OFFOFF all filtersall filters, compression, and DSP , compression, and DSP functions. Computer does these jobs.functions. Computer does these jobs.
�� PSKPSK--31 software acts like a digital signal 31 software acts like a digital signal processor (DSP) to compute the incoming processor (DSP) to compute the incoming and outgoing signalsand outgoing signals
Digital FrequenciesDigital Frequencies
Band PSK-31 SSTV RTTY ASCII MFSK
160 3.812 1.918 1.812 1.812 1.812
80 3.580 3.845 3.580 3.580 3.580
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40 7.070 7.228 7.080 7.080 7.073
30 10.137 10.130 10.130 10.130
20 14.070 14.230 14.080 14.080 14.073
17 18.100 18.100 18.100 18.104
15 21.070 21.340 21.080 21.080 21.073
12 24.925 24.920 24.920 24.925
10 28.120 28.680 28.080 28.080 28.080
How is PSKHow is PSK--31 Tuned31 Tuned
�� PSKPSK--31 is a continuous carrier signal31 is a continuous carrier signal
�� Spectrum or Waterfall displays for tuningSpectrum or Waterfall displays for tuning
�� Left mouse click sets receiving frequencyLeft mouse click sets receiving frequency
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�� Left mouse click sets receiving frequencyLeft mouse click sets receiving frequency
�� Right mouse click sets transmit frequencyRight mouse click sets transmit frequency
�� Computer displays frequency above Computer displays frequency above transceiver setting.transceiver setting.
�� Listening is unnecessary Listening is unnecessary
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Receive Text Here
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Receive Text Here
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Transmit Text Here
Receive Text Here
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Transmit Text Here
Control and Mode Settings
Receive Text Here
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Transmit Text Here
Control and Mode Settings
Spectrum Display
Receive Text Here
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Transmit Text Here
Control and Mode Settings
Waterfakk Display
How Many Stations at Once ?How Many Stations at Once ?
�� 3000 Hz USB Bandwidth3000 Hz USB Bandwidth
Each PSKEach PSK--31 station needs about 100 31 station needs about 100
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�� Each PSKEach PSK--31 station needs about 100 31 station needs about 100 Hz. allowing for ample separation.Hz. allowing for ample separation.
�� 3000/100 = 30 stations visible.3000/100 = 30 stations visible.
How is the Tx Signal Generated?How is the Tx Signal Generated?
�� The Computer generates an audio tone The Computer generates an audio tone using your sound card.using your sound card.
�� The audio tone is fed to your SSB rig’s The audio tone is fed to your SSB rig’s microphone input.microphone input.
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microphone input.microphone input.
�� Your rig produces an RF carrier equal to the Your rig produces an RF carrier equal to the tuned frequency plus the audio tone. tuned frequency plus the audio tone.
�� Adjust the microphone gain down for Adjust the microphone gain down for 25 25 watts output maximum !watts output maximum !
Why Such Low Power ?Why Such Low Power ?
�� You are transmitting a CW carrier You are transmitting a CW carrier signal full time. signal full time.
�� The narrow signal requires very low The narrow signal requires very low
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�� The narrow signal requires very low The narrow signal requires very low distortion. distortion.
�� Use of high power produces distortion Use of high power produces distortion and spurious interference over entire and spurious interference over entire band.band.
The PSKThe PSK--31 Display31 Display
�� Pentiun II or better, color VGA monitorPentiun II or better, color VGA monitor
�� Standard sound card, mouseStandard sound card, mouse
�� Free softwareFree software
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�� Free softwareFree software
–– DigiPanDigiPan
–– HamScopeHamScope
–– WINPSK WINPSK
–– W1SQLPSKW1SQLPSK
The Sound Card AdapterThe Sound Card Adapter
�� Radio Shack Stereo Patch Cable Radio Shack Stereo Patch Cable …………………..(receive only) $4.96…………………..(receive only) $4.96
�� RigBlaster $89.99RigBlaster $89.99
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�� RigBlaster $89.99RigBlaster $89.99
�� Tigertronics $69.95Tigertronics $69.95
�� MFJ $59.99MFJ $59.99
�� (Homebrew) about $25.00(Homebrew) about $25.00
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Simple Digital Adapter
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Rig Requirements:Rig Requirements:
�� 160 through 10 meters160 through 10 meters
�� USB (even on 40 and below)USB (even on 40 and below)
�� Under 25 WattsUnder 25 Watts
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�� Under 25 WattsUnder 25 Watts
�� Digital tuning necessary to control Digital tuning necessary to control frequency stabilityfrequency stability
�� VHF/UHF uses audio frequency keying VHF/UHF uses audio frequency keying (AFSK)(AFSK)
Other ModesOther Modes
�� QPSK, BPSK, MFSKQPSK, BPSK, MFSK
�� PSKPSK--6464
�� RTTY, MMTTYRTTY, MMTTY
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�� RTTY, MMTTYRTTY, MMTTY
�� SSTV, MMSSTVSSTV, MMSSTV
�� HellscreiberHellscreiber
�� CWCW
�� PacketPacket
On the WEB . . . . . .On the WEB . . . . . .
�� http://www.qsl.net/hamscopehttp://www.qsl.net/hamscope
�� http://www.digipan.nethttp://www.digipan.net
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�� http://www. psk31.com/software/software.htmhttp://www. psk31.com/software/software.htm
�� http://www.mmhamsoft.amateurhttp://www.mmhamsoft.amateur--radio.caradio.ca
�� http://www.faria.net/w1sqlhttp://www.faria.net/w1sql
ddanner@earthlink.netddanner@earthlink.net
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TYPE ON …………TYPE ON …………
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TYPE ON …………TYPE ON ………… de K6AIX
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