Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital...
Transcript of Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital...
![Page 1: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/1.jpg)
Digital Communications
PSK31
Bob Wilton – KF5TPQ
![Page 2: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/2.jpg)
Digital Communications – PSK31
Digital Communications Overview
PSK31 – What is it?
Hardware Considerations
Software Considerations
Ham Radio Deluxe – DM780
Configuring
Lets look at a QSO
Other Resources
Questions (Ask questions anytime)
![Page 3: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/3.jpg)
Digital Communications
Computers and digital data
Text data
1’s and 0’s, bits, bytes, characters, variable character sets
Transmission modes – AFSK, PSK (frequency vs phase shifting)
Bandwidth
Signal to noise ratio
So many Operating modes
RTTY, PSK31, JT65, JT9, Winlink2K, Olivia, Opera, Hell, and more
PSK31 and Winlink2K (Georgia ARES)
![Page 4: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/4.jpg)
Digital Bands
![Page 5: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/5.jpg)
PSK31
Why PSK31 ?
Widely used and just a good place to start
BPSK (Binary Phase Shift Keying – 180 degrees)
Low power: 5 – 40 watts (lower the better)
100% duty cycle
ALC and IMD considerations
Bandwidth approximately 31 hz
Throughput – up to about 50 words per minute
Varicode character set
Variable length, e = 11, E = 1110111
Works well in poor noise and poor propagation conditions
PSK63 and PSK125
![Page 6: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/6.jpg)
PSK31 Frequencies
10 Meters – 28,120
12 Meters – 24,920
15 Meters – 21,080
17 Meters – 18,100
20 Meters – 14,070
40 Meters – 7,080
80 Meters – 3,580
![Page 7: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/7.jpg)
Hardware Considerations
HF Transceiver
Computer (or laptop or even a tablet)
Interface
Audio and ptt
Line out
Sound card
Line in
Mic Audio out
![Page 8: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/8.jpg)
Hardware Considerations
Homebrew
Line out
Sound card
Line in
Audio out
100k 1k
Mic
22k
2N2222
1N4148PTT
Serial
RTS
PTT via serial port
(RTS, DSR, or similar
signal line)
![Page 9: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/9.jpg)
Hardware Considerations
Mic
Audio out
Sound
Card
Interface
West Mountain Radio RIGblaster
(about 5 types)
MFJ make a few
MicroHAM
RigExpert
SignaLink USB Interface
Many more, inc many homebrew
designs starting at about $10
![Page 10: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/10.jpg)
Software Considerations
Windows, Mac, Linux, IPAD, Android
Multiple “FREE” software programs available
Ham Radio Deluxe – DM780
Digipan
Fldigi
Hamscope
WinWarbler
And more………….
Ham Radio Deluxe version 5 - Free
![Page 11: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/11.jpg)
Ham Radio Deluxe - HRD
![Page 12: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/12.jpg)
Ham Radio Deluxe – DM780
![Page 13: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/13.jpg)
Ham Radio Deluxe – DM780
![Page 14: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/14.jpg)
Ham Radio Deluxe – DM780
![Page 15: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/15.jpg)
Ham Radio Deluxe – DM780
![Page 16: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/16.jpg)
Ham Radio Deluxe – DM780
![Page 17: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/17.jpg)
Ham Radio Deluxe – DM780
![Page 18: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/18.jpg)
Ham Radio Deluxe – DM780
![Page 19: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/19.jpg)
Ham Radio Deluxe – DM780
PSK63
PSK125
![Page 20: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/20.jpg)
Ham Radio Deluxe – DM780
![Page 21: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/21.jpg)
Additional Resources - PSKReporter
![Page 22: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/22.jpg)
Additional Resources – HDRlog.net
![Page 23: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/23.jpg)
Additional Resources – QRZ.com
![Page 24: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/24.jpg)
Additional Resources - Google
![Page 25: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/25.jpg)
Digital Communications – JT65
![Page 26: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/26.jpg)
Digital Communications - JT65
CQ N0RQ EM13 (I CQ)
N0RQ W1AW FN31 (he answers with his grid)
W1AW N0RQ -06 (I send signal report)
N0RQ W1AW R-13 (he sends Roger and my signal report)
W1AW N0RQ RRR (I acknowledge receipt of his report)
N0RQ W1AW 73 (he sends a standard or freeform 73)
10W DIPOLE 73 (I send a freeform or standard 73 – contact
is over)
![Page 27: Digital Communications - MARCmtnarc.org/index_htm_files/Digital Communications.pdf · Digital Communications Computers and digital data Text data 1’s and 0’s, bits, bytes, characters,](https://reader034.fdocuments.us/reader034/viewer/2022052204/5b14fcf87f8b9ab6778d070f/html5/thumbnails/27.jpg)
Digital Communications – JT9