BPSK31 how to

Want to to learn a Digital mode for AMATEUR RADIO? BPSK31

First of all what is PSK:
What is PSK?
– PSK is an acronym for Phase Shift Keying. Information is transmitted
through patterns of polarity-reversals (180 degree phase shifts), hence the
– Narrow-band, low-power, soundcard-generated radioteletype mode for
keyboard chat.
– Three data rates, 31, 63 and 125 baud. Bandwidth increases with rate.
– PSK31 is the most commonly used, its data rate is close to the speed of the
average typist.
– PSK is resistant to interference but has no error control, so it's not suitable
for transfer of data files. © 2013 Eric Fowler / WV3E – All rights reserved.


Fldigi is a computer program intended for Amateur Radio Digital Modes operation using a PC (Personal Computer). Fldigi operates (as does most similar software) in conjunction with a conventional HF SSB radio transceiver, and uses the PC sound card as the main means of input from the radio, and output to the radio. These are audio-frequency signals. The software also controls the radio by means of another connection, typically a serial port.

Fldigi is multi-mode, which means that it is able to operate many popular digital modes without switching programs, so you only have one program to learn. Fldigi includes all the popular modes, such as DominoEX, MFSK16, PSK31, and RTTY.

Unusually, Fldigi is available for multiple computer operating systems; FreeBSD™; Linux™, OS X™ and Windows™.
(taken from w1hjk.com)

how to recognize the bpsk31:

Recognising the different modes comes with experience. It is a matter of listening to the signal, and observing the appearance of the signal on the tuning display. You can also practise transmitting with the transceiver disconnected, listening to the sound of the signals coming from the computer. There is also (see later paragraph) an automatic tuning option which can recognise and tune in most modes for you.

The software provides a tuning display which shows the radio signals that are receivable within the transceiver passband. Using a point and click technique with the mouse, you can click on the centre of a signal to select it, and the software will tune it in for you. Some modes require more care than others, and of course you need to have the software set for the correct mode first — not always so easy!

The RSID (automatic mode detection and tuning) feature uses a special sequence of tones transmitted at the beginning of each transmission to identify and tune in the signals received. For this feature to work, not only do you need to enable the feature in the receiver, but in addition the stations you are wishing to tune in need to have this feature enabled on transmission. Other programs also offer this RSID feature as an option.

PSK31 Frequencies In MHz,

7.040 to 7.060 for region 1 and region 3, and 7.070 for region 2 *
21.080 (although most activity can be found 10 kHz lower)

for more information check


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