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

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What is psk31 l.jpg
What is PSK31?

  • A digital mode

  • Created by Peter Martinez, G3PLX

  • PSK stands for Phase Shift Keying

  • 31 is the bit rate


Characteristics of psk31 l.jpg
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

  • Transcontinental QSO’s 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.


Equipment l.jpg
Equipment

  • 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.)

  • PC

    • Most PSK-31 software is compatible with any version of Windows

    • Sound card (16 bit Sound Blaster or better) is required

  • An interface that connects the PC and the transceiver

    • Commercially made (RigBlaster, RASCAL, etc.)

    • Homebrew

    • Audio Coupled

  • Computer Software

    • Ham Radio Deluxe (HRD)

    • Digipan

    • Hamscope


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My Shack

  • IC-718

  • Interface cables purchased from Associated Radio

  • eMachine running Windows 7

  • Ham Radio Deluxe


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PC Interface

  • 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 computer’s 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.

  • A simple homebrew interface can normally be built for less than $10.

  • Certain transceivers can be connected directly to a PC:

    • ICOM 756

    • Yaesu FT-920


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Acoustic Coupling

Rig’s speaker is placed near the PC’s microphone

  • Rig’s microphone is placed next to the PC’s speaker

  • VOX is used for T/R switching

  • Advantages

    • Absolutely no extra equipment required.

    • Good electrical isolation between PC and rig

  • Disadvantages

    • Transmit levels can be tricky to adjust

    • Ambient noise degrades signal


Basic psk31 setup l.jpg
Basic PSK31 Setup

  • 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)

  • The transmit level should be set using the level controls in the software or the rig’s 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

  • PSK31 software running


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PSK31 Software

  • There is serveral good free software packages available

    • Ham Radio Deluxe

    • Hamscope

    • Digipan


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PSK31

PSK31

PSK31

CW

PSK31

PSK31

PSK31

PSK31

PSK31

Contesia

The Waterfall

Receive

Transmit


Hrd qso screen l.jpg
HRD QSO Screen

Receive Screen

Transmit Screen

Waterfall Display


Hrd super browser screen l.jpg
HRD Super Browser Screen

Waterfall Screen

Receive Screen

Transmit Screen


Where to find psk31 l.jpg
Where to find PSK31

  • PSK-31 activity is concentrated around the following frequencies:

    • 1.83815 MHz

    • 3.580 MHz

    • 7.035 MHz

    • 14.07 MHz

    • 18.100 MHz – great band for Europe and Pacific

    • 21.070 MHz

    • 24.920 MHz

    • 28.120 MHz


My success with psk31 l.jpg
My Success with PSK31

  • Over 680 contacts on PSK31

  • 75 countries

  • All HF bands except 160 meters