ARDOP
ARDOP ( English Amateur Radio Digital Open Protocol , Open digital protocol for the amateur radio service ) describes a digital operating mode in the amateur radio service .
purpose
It was developed for use with WinLink on shortwave and enables the transmission of data, e.g. B. E-mails over shortwave in amateur radio. It is a further development of the WINMOR protocol. ARDOP offers an alternative to PACTOR transmission in the shortwave range of the WinLink system. The protocol was presented at the 2015 ARRL / TAPR Digital Communications Conference (DCC). Unlike PACTOR ARDOP works without expensive hardware TNC , it rich the sound card of a computer and an SSB - transceiver for modulating and demodulating. However, with a bandwidth of 2000 Hz, ARDOP can only achieve a data transfer rate of up to 2296 bit / s; PACTOR-IV, on the other hand, can achieve a data transmission rate of up to 5512 bit / s with a bandwidth of 2400 Hz without compression . In comparison, ISDN has a data transfer rate of 64,000 bit / s (64 kbit / s).
ARDOP can work with bandwidths of 200, 500, 1000 and 2000 Hz . It is fully disclosed and can be used with no license fees.
ARDOPC
A version of the program in C called ARDOPC has been published for use under Linux and without a GUI .
modulation
All modes use Reed-Solomon codes for forward error correction . Bit-synchronous transmission using the ARQ protocol enables error-free data transmission between two stations. With the ARDOP modulation, different variants are used , from fourfold frequency shift keying through eightfold phase shift keying up to sixteenfold quadrature amplitude modulation .
| Modulation method |
Bandwidth ( Hz ) |
Carrier |
Symbol rate ( baud ) | Max. Gross data throughput (B / min) |
|---|---|---|---|---|
| 8 FSK | 200 Hz | 1 | 25th | 288 |
| 4FSK | 200 Hz | 1 | 50 | |
| 4 PSK | 200 Hz | 1 | 100 | |
| 8PSK | 200 Hz | 1 | 100 | 1,512 |
| 16FSK | 500 Hz | 1 | 25th | 329 |
| 4FSK | 500 Hz | 1 | 100 | |
| 4PSK | 500 Hz | 2 | 100 | |
| 8PSK | 500 Hz | 2 | 100 | |
| 16 QAM | 500 Hz | 2 | 100 | 2,034 |
| 4FSK | 1000 Hz | 2 | 100 | |
| 4PSK | 1000 Hz | 4th | 100 | |
| 8PSK | 1000 Hz | 4th | 100 | |
| 8PSK | 1000 Hz | 4th | 167 | 8,610 |
| 4FSK | 2000 Hz | 4th | 100 | |
| 4PSK | 2000 Hz | 8th | 167 | |
| 8PSK | 2000 Hz | 8th | 100 | |
| 8PSK | 2000 Hz | 8th | 167 | 17,220 |
Host software
| program | operating system | License |
|---|---|---|
| BPQ32 / LinBPQ | Windows 95 and higher, Linux | Freeware |
| AirMail (with BPQ32) | Windows 95 and higher | Freeware |
| WinLink Express | Windows XP and higher, Linux (with Wine ) | Freeware |
| Patient | Windows, Linux, Mac OS X | Freeware |
| ARIM | Windows, Linux | Freeware |
Web links
- ARDOP News. In: winlink.org. Retrieved February 2, 2017 .
- ARDOP overview. In: winlink.org. June 13, 2015, accessed February 2, 2017 .
Individual evidence
- ↑ John Wiseman, G8BPQ: Running ARDOPC. (No longer available online.) Archived from the original on February 16, 2017 ; accessed on February 15, 2017 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
