ROS (operating mode)
ROS is a teletype - operating in the amateur and CB radio .
description
ROS was published in 2010 by the Spanish radio amateur José Alberto Nieto Ros ( amateur radio call sign EA5HVK). It is suitable for difficult transmission conditions, as they are typical on shortwave or earth-moon-earth (low signal-to-noise ratio and multi-path reception ). The signal can still be decoded if it is more than 30 dB weaker than the noise, i.e. H. can no longer be perceived by the human ear.
The signal is sent with multiple frequency shift keying (MFSK with 16 tones) and forward error correction (FEC), comparable to Olivia MFSK , but with lower demands on the signal-to-noise ratio due to the higher bandwidth. A ROS signal can have different formats, usually a bandwidth of 2250 Hz with a baud rate of 4, 8 or 16. The tones are spaced apart by 125 Hz, 32.5 Hz for the narrow-band version and 32.5 Hz for the version for Amateur radio bands on medium and long wave a distance of only 6.5 Hz.
Since the inventor first referred to ROS as the spread spectrum method, the American licensing authority FCC expressed concerns about use on shortwave . In the USA, spread spectrum may only be used by radio amateurs on frequencies from 222 MHz. However, it is not a spread spectrum method.
The first connection with ROS took place on February 18, 2010 on the 40-meter tape , from Spain to the Netherlands. On February 22nd, 2010 the first earth-moon-earth two-way connection followed, between Germany and Greece in the 2-meter band . The first ROS connection with a specially licensed amateur radio station in the USA took place on February 1, 2012 ( UTC ) on the 30-meter band to Spain.
Frequencies
Amateur radio
The following frequencies are preferred by ROS in amateur radio :
| 2.2 km | Fashion |
|---|---|
| 136 kHz | USB |
| 630 m | Fashion |
| 476 kHz | USB |
| 160 m | Fashion |
| 1,840 kHz | USB |
| 80 m | Fashion |
| 3,583 kHz | USB |
| 3,585 kHz | USB |
| 3,587 kHz | USB |
| 3,589 kHz | USB |
| 60 m | Fashion |
| 5,367 kHz | USB |
| 40 m | Fashion |
| 7,040 kHz | USB |
| 7,044 kHz | USB |
| 7,046 kHz | USB |
| 7,048 kHz | USB |
| 30 m | Fashion |
| 10.132 kHz | USB |
| 10.134 kHz | USB |
| 20 m | Fashion |
| 14.088 MHz | USB |
| 14.101 MHz | USB |
| 14.103 MHz | USB |
| 14.116 MHz | USB |
| 17 m | Fashion |
| 18.107 MHz | USB |
| 18.111 MHz | USB |
| 15 m | Fashion |
| 21.110 MHz | USB |
| 21.115 MHz | USB |
| 12 m | Fashion |
| 24.916 MHz | USB |
| 24.926 MHz | USB |
| 10 m | Fashion |
| 28.185 MHz | USB |
| 28.295 MHz | USB |
| 6 m | Fashion |
| 50.245 MHz | USB |
| 4 m | Fashion |
| 70.280 MHz | USB |
| 2 m | Fashion |
| 144.980 MHz | USB |
| 70 cm | Fashion |
| 432.097 MHz | USB |
CB radio
The following frequencies in the 11 meter band are preferred frequencies for ROS in CB radio :
| 11 m | CEPT channel | Fashion |
|---|---|---|
| 27.245 MHz | Channel 25 | USB |
| 27.365 MHz | Channel 36 | USB |
| 27.635 MHz | (no channel; is close to UK channel 4) | USB |
The frequency 27.635 MHz is outside the ranges permitted for CB radio or amateur radio. It is therefore i in Germany. A. not legally usable.
literature
- Eike Barthels: ROS - a new type of digital broadcast . In: radio amateur . No. 9 , 2010, ISSN 0016-2833 , p. 918-919 .
- Urs Sigrist and Dora Mayer Sigrist: The new ROS operating mode . In: CQ DL . No. 5 , 2013, ISSN 0178-269X , p. 316-317 .
Web links
- Official website (English)
- About ROS (English)
- European ROS Club (English / Spanish)
- ROS in the Signal Identification Wiki (audio files, waterfall graphics and other information).
Individual evidence
- ↑ usually in the modulation type J2B, cf. VO Funk , 2012, Appendix 1
- ↑ Jesus Vidal (CO2DC): ROS Help. ( PDF ; 124 kB) (No longer available online.) January 17, 2012, archived from the original on May 8, 2014 ; accessed on February 7, 2013 . 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.
- ↑ Luis A. del Molino: El modo ROS: ¿ya lo has probado? In: CQ, October 2011, pages 18-23; November 2011, pages 19-25; December 2011, pages 8-14.
- ↑ FCC Reaffirms Statement on ROS
- ↑ 47 CFR 97.305 (Code of Federal Regulations, Title 47, Chapter I, Subchapter D, Part 97, Subpart D, Section 97.305 - Authorized emission types)
- ↑ Mike Richards: "Spread-spectrum? - No, it's not!". In: Practical Wireless , May 2011, pages 36-38.
- ↑ ROS User's Guide V2.0 (PDF; 6.4 MB)
- ↑ FCC Spread Spectrum tests off to a good start
Remarks
- ↑ a b Not allowed in Germany according to the Amateur Radio Ordinance (AFuV).