1. Write-Log, Binary Phase Shift Keying (PSK31), Digital Panoramic Tuning (DigiPan) and Radio Set-Up.

2. Write-Log Click her to open this box. Set the frequency and mode
before operating.
Click FSK for PSK-31 Contacts.
Please try not to forget to avoid
unnecessary editing.

3. Write-Log Click Window then Super Check Partial Click Window then
Band Summary.
Networking will display all
Stations.
Click Contest
then
Multipliers
Logged Stations
Enter Call, Operating Class and Section.
Tab over by using Space Bar
“Alt W” Clears this entire row. Left, Right Arrows and Backspace allows for editing.

4. What is PSK31?
PSK31 was developed by Peter Martinez (G3PLX) and introduced to the amateur community in December 1998.
PSK31 was also known as Varicode Mode (Variable Number of Bits)
From the perspective of the transmitter, this amounts to little more than somebody whistling into the microphone.
PSK31 rapidly shifts the phase of the audio signal between two states. These shifts serve the same function as two FSK tones traditionally used by RTTY Instead of shifting frequency we’re shifting phase.
PSK31's bandwidth of 31.25 Hz was chosen because a normal typing speed of about 50 words per minute requires a bit rate of about 32 bits per second (1Bit/Hz).
PSK31’s 31.25 Hz can be derived from the 8 KHz sample rate used by the DSP chips in computer sound cards

5. What is PSK31? BIT Value Amount of Shift Degrees of Shift None 00 1
None 00 1
1/2
1800
Time Domain
Frequency Domain

6. PSK 31 vs. RTTY
The chart at the right shows the BIT Error Rate (BER) as a function of Signal-to-Noise ratio in a noiseless environment.
Note: BER is the number of BIT’s received in error. For example, a BER of 10-5 is 1 erroneous BIT received in error out of 100,000.
For Signal-to-Noise (S/N) ratios greater than 10 dB, PSK-31 is virtually error free.
S/N=10Log(Power of the Signal ÷ Power of the Noise). In other terms, if the noise level is 1uV then you need 3.16uV for 10dB S/N
At poor S/N ratios the BER of PSK-31 is five times better than RTTY
Note the curve that represents QPSK-31.
Signal-to-Noise Ratio (dB)
Bit Error Rate
PSK-31
RTTY
QPSK-31

7. PSK31 - Real World Performance
The power in a PSK-31 signal is concentrated in a Hz bandwidth versus 250 Hz (BW not frequency shift) for RTTY and 3300 Hz for SSB.
Assuming 100 watts of transmit power, the PSK-31 signal has 3.2 watts/Hz vs. 30mW/Hz for SSB.
If a signal provides 20 dB S/N ratio at the receiver using SSB, the same S/N ratio is achieved with 8W using RTTY and only 1W using PSK-31!
Lower Case characters are more efficient than upper case due to Varicode (not to be confused with ASCII or Binary code). PSK31 characters contain a variable number of bits.
Lower-case PSK31 characters have fewer bits than their upper-case equivalents, so lower-case text transmits faster and decodes better
For example, the letter “a” has the Varicode The capital letter “A” has a Varicode of
The letter “a” has four BIT’s

8. FYI: The better alternative QPSK31
QPSK31 has FEC convolutional code; lowers the number of errors
Forward Error Correction (FEC) is when redundant data is sent 900 out of phase with the primary data stream.
A Viterbi Decoder decodes the bit stream and estimates likelihood the data is correct or not. If not it corrects the error.
Under very poor propagation conditions (like now); 1 out of 5 PSK-31 characters get thru compared to 1 out of 2 QPSK-31 characters.

9. DigiPan – Signal Channel
This is the
Receive
Window
Right Click to put cursor on the signal you want to
receive.
This is the
Transmit Window

10. DigiPan – Multichannel
Preset FD
Macro's
3A NNJ
Click Call
Goes here CQ
IMD

11. Radio Set Up
PSK-31 is a 100% duty cycle mode. For all radio’s reduce power by 50%
Turn Audio Compression OFF
With MIC Gain very low and power very low click T/R button on DigiPan to Transmit
Adjust MIC gain so ALC has little or no needle movement
This is to prevent Inter-Modulation Distortion from being transmitted. Digital waveforms inherently produce IMD’s.
Adjust power to ~50W (typical).
Re-adjust MIC gain for little or no ALC needle movement
Re-adjust power output.
Click T/R again to go back to Receive
You can operate any mode that you please; SSB, CW or PSK-31. All three HF stations will have full three mode capability.
If you don’t know ASK!!! Don’t guess!!!