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PSK31. What is PSK31? A digital mode A digital mode Created by Peter Martinez, G3PLX Created by Peter Martinez, G3PLX PSK stands for Phase Shift Keying.

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Presentation on theme: "PSK31. What is PSK31? A digital mode A digital mode Created by Peter Martinez, G3PLX Created by Peter Martinez, G3PLX PSK stands for Phase Shift Keying."— Presentation transcript:

1 PSK31

2 What is PSK31? A digital mode A digital mode Created by Peter Martinez, G3PLX Created by Peter Martinez, G3PLX PSK stands for Phase Shift Keying PSK stands for Phase Shift Keying 31 is the bit rate 31 is the bit rate

3 Characteristics of PSK31 The power in a PSK-31 signal is concentrated in a 31 Hz bandwidth, versus 250 Hz for RTTY and 3300 Hz for SSB The power in a PSK-31 signal is concentrated in a 31 Hz bandwidth, versus 250 Hz for RTTY and 3300 Hz for SSB Transcontinental QSOs using PSK-31 are possible using less than 50 W under any conditions and when conditions are good, QRP (< 5W) PSK-31 contacts are possible to any point on the planet. Transcontinental QSOs using PSK-31 are possible using less than 50 W under any conditions and when conditions are good, QRP (< 5W) PSK-31 contacts are possible to any point on the planet.

4 Equipment Amateur transceiver that has low frequency drift Amateur transceiver that has low frequency drift Any modern solid state rig is OK (IC-706, IC-746, TS-940, TS2000, FT-1000, Omni VI, etc.)Any modern solid state rig is OK (IC-706, IC-746, TS-940, TS2000, FT-1000, Omni VI, etc.) PC PC Most PSK-31 software is compatible with any version of WindowsMost PSK-31 software is compatible with any version of Windows Sound card (16 bit Sound Blaster or better) is requiredSound card (16 bit Sound Blaster or better) is required An interface that connects the PC and the transceiver An interface that connects the PC and the transceiver Commercially made (RigBlaster, RASCAL, etc.)Commercially made (RigBlaster, RASCAL, etc.) HomebrewHomebrew Audio CoupledAudio Coupled Computer Software Computer Software Ham Radio Deluxe (HRD)Ham Radio Deluxe (HRD) DigipanDigipan HamscopeHamscope

5 My Shack IC-718 IC-718 Interface cables purchased from Associated Radio Interface cables purchased from Associated Radio eMachine running Windows 7 eMachine running Windows 7 Ham Radio Deluxe Ham Radio Deluxe

6 PC Interface The interface provides matching and isolation between the audio inputs and outputs of the PC and the transceiver The interface provides matching and isolation between the audio inputs and outputs of the PC and the transceiver The interface may also provide connections between the computers serial port and the PTT input of the transceiver The interface may also provide connections between the computers serial port and the PTT input of the transceiver Commercially made interfaces provide lots of functions and are very easy to install. However, they can be expensive. Commercially made interfaces provide lots of functions and are very easy to install. However, they can be expensive. A simple homebrew interface can normally be built for less than $10. A simple homebrew interface can normally be built for less than $10. Certain transceivers can be connected directly to a PC: Certain transceivers can be connected directly to a PC: ICOM 756 Yaesu FT-920

7 Acoustic Coupling Rigs speaker is placed near the PCs microphone Rigs microphone is placed next to the PCs speakerRigs microphone is placed next to the PCs speaker VOX is used for T/R switchingVOX is used for T/R switching AdvantagesAdvantages Absolutely no extra equipment required. Absolutely no extra equipment required. Good electrical isolation between PC and rig Good electrical isolation between PC and rig DisadvantagesDisadvantages Transmit levels can be tricky to adjust Transmit levels can be tricky to adjust Ambient noise degrades signal Ambient noise degrades signal

8 Basic PSK31 Setup The HF rig should be in the USB mode. The HF rig should be in the USB mode. Output power should be set to 30 – 50 (this is a full duty mode – do not set to full power) Output power should be set to 30 – 50 (this is a full duty mode – do not set to full power) The transmit level should be set using the level controls in the software or the rigs mic gain control so that the ALC level is just tickled The transmit level should be set using the level controls in the software or the rigs mic gain control so that the ALC level is just tickled The receive level should be adjusted to a level that does not overdrive the sound card The receive level should be adjusted to a level that does not overdrive the sound card PSK31 software running PSK31 software running

9 PSK31 Software There is serveral good free software packages available There is serveral good free software packages available Ham Radio DeluxeHam Radio Deluxe HamscopeHamscope DigipanDigipan

10 The Waterfall PSK31 CW Contesia Receive Transmit

11 HRD QSO Screen Waterfall Display Transmit Screen Receive Screen

12 HRD Super Browser Screen Receive Screen Transmit Screen Waterfall Screen

13 Where to find PSK31 PSK-31 activity is concentrated around the following frequencies: PSK-31 activity is concentrated around the following frequencies: MHz MHz MHz3.580 MHz MHz7.035 MHz MHz14.07 MHz MHz – great band for Europe and Pacific MHz – great band for Europe and Pacific MHz MHz MHz MHz MHz MHz

14 My Success with PSK31 Over 680 contacts on PSK31 Over 680 contacts on PSK31 75 countries 75 countries All HF bands except 160 meters All HF bands except 160 meters

15 Contacts for Last 3 months

16 Questions?


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