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PSK31 - PowerPoint PPT Presentation

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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

  • 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

Acoustic coupling l.jpg
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

The waterfall l.jpg











The Waterfall



Hrd qso screen l.jpg
HRD QSO Screen

Receive Screen

Transmit Screen

Waterfall Display

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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