PSK31
Visit WM2U WEBSITE, for more details.
Based
on an idea by SP9VRC and developed by Peter Martinez,
G3PLX a new Amateur Mode called PSK31 is emerging.
Instead of keying using Frequency Shift, FSK, this mode uses
Phase Shift Keying, PSK. It uses an alphabet similar to Morse
which gives a text speed of about 50 wpm. Our experience to date shows that
even without an error correcting algorithm, copy is as good as any and
better than most at low signal levels. It is a particularly attractive mode
since it requires no lock condition or handshaking with a second radio
station, and roundtable QSO's with more than two stations can be enjoyed.
|
Download from here! | The original PSK31
program written by Peter Martinez, G3PLX. file name psk31sbw.zip |
Detailed Tutorials |
ftp from PSK Home Page | ||
from PSK Home Page | ||
from Kender mirror site. | ||
PhaseShift | by Edson, N1VTN (Linux) | |
TWPSK | by Hansi, DL9RDZ (Linux) | |
KPSK | by Luc, LX2GT (Linux) | |
MultiMode | by Chris, N3JLY (Macintosh) | |
GenLog | by Dave, W3KM | |
PSK-PAL | by Erik, VK7AAB | |
PSK-GNR | by Al, WD5GNR | PSK-GNR |
PSK Deluxe | by Simon, HB9DRV | |
MixW | by Nick, UT2UZ | |
MultiPSK | by ?, F6CTE | |
N1MM Logger | by Tom, N1MM | |
DigiPan | by Skip, KH6TY | DigiPan |
DX4WIN | by Steve, NR4M | |
RCKRTTY | by Walter, DL4RCK | |
Zakanaka | by Bob, K4CY | |
TrueTTY | by Sergei, UA9OSV | TrueTTY |
WinPSK | by Moe, AE4JY | |
WinPSKse | by Dave, KA1DT | |
DxPSKus | by Christian, F6GQK | |
WinWarbler | by Dave, AA6YQ | |
WriteLog | by Ron, K5DJ | |
W1SQLPSK | by Joe, W1SQL |
The simplest and quickest computer to radio interface is to connect the Line Output from the Sound Card to the transceiver audio input with a 100:1 voltage divider to reduce the voltage output, and the Sound Card Line Input to the audio output of the radio. You can use the VOX to switch from Receive to Transmit. To setup this arrangement, adjust the sound card output level using the computer 'mixer' control until maximum transmit power is reached, and the ALC is just starting to read. Then tune to a strong carrier and adjust the soundcard input gain until the red line goes away as observed on the spectrum display. waterfall i(ndicator) This procedure is covered in great detail in the PSK31 Help files under "setting up the sound card". |
The
circuit below shows the method I used which isolates the Sound
Card Line In and Line Out from the Radio using a couple of Radio Shack
transformers, and a 2N2222 transistor to switch the PTT radio line triggered
by the RTS line of the computer Com Port. All audio levels are
equalized when running either the computer, the SSTV program or PSK31.
To adjust this circuit, tune to a strong carrier and adjust the Rig
Volume until the red overload lines disappear. At this point simply
tweak RV1 to give the required output power from the transmitter.
|
To
completely isolate the computer from the radio the PTT line
schematic shown above should be replaced by the following optically
coupled circuit. I have this unit installed and it works great. The
Opto Isolator is a 4N29, ECG 3084 or equivalent from Digi-Key, Newark or
Radio Shack, part #901-1617. |
|
An e-mail off Ken, W7LAR gives us a great tip by the way. If you want to get the Optoisolator from Radio Shack it will probably not be a store stocked item. You can get it direct mailed to your home by asking the shop clerk to order it for you from there warehouse. It is number 11305190 and costs about $3.00 |
It
is strongly recommended that you download the file
psk31sbw.zip and
install it. Then print off the help files. I will not repeat
any of the details that can be found in these files since Peter, G3PLX has
done an excellent job. As well as the setup instructions for the sound card
and software there is an excellent section on the Modulation Theory,
the new character set and a general overview of PSK31.
|
The
calling frequencies that have been decided upon for the time being are: 1838.15kHz, 3580.15kHz, 7070.15kHz, 7035.15kHz, 14070.15kHz, 21080.15kHz, 28120.15kHz, 50.290mHz, 144.144mHz, 222.07mHz, 432.2mHz, 909mHz and 10137.15kHz, 18100.15kHz and 24925kHz suggested for the WARC Bands. |
From
the PSK31 help files Peter, G3PLX suggests using USB on all
bands. Please read the help file section: PSK31 Operating > Sideband
selection with PSK31. This has ALL the answers to the sideband
discussion. To get you going fast, check out... WM2U's Tip List. |
|