P4-A WB Transponder Bandplan and Operating GuidelinesSeptember 17, 2018
The following operating guidelines and bandplan are designed to enable the most efficient use of the 8MHz wide transponder for all users.
Due to the very large number of variations of transmission parameters, it is essential that all users notify their transmission parameters on the co-ordination chat room page that has been established at the Qatar-OSCAR 100 Wideband Spectrum Monitor which is operated by the BATC / AMSAT-UK and hosted at the Goonhilly Earth Station in Corwall, UK.
As a general principle, the transponder should be only be used for short-duration tests and contacts.
The only long duration (more than 10 minute) transmissions should be:
- The TV beacon channel uplinked from Qatar or Bochum.
- Video of the live proceedings of AMSAT and Amateur TV Lectures and Conferences of wide interest. Examples might include:
- National AMSAT Conferences
- National Amateur TV Conventions
The following content is unacceptable:
- Recordings of events, or broadcast of events not explicitly concerned with Amateur Satellites or Amateur TV
- Transmission of any copyright material (such as movies or TV channels)
- The relaying of terrestrial Amateur TV Repeaters is discouraged unless the content is of exceptional amateur radio interest.
All uplink transmissions should use the minimum power possible. No transmissions should have a downlink signal with a higher power density than the Beacon – the web-based spectrum monitor will enable users to set their uplink power to achieve this.
Transmissions should use DVB-S2 where possible. For normal standard definition transmissions, 2 MS is the maximum symbol rate that should be used.
To enable easy decoding PIDs should be set as: Video 256, Audio, 257, PMT 32 or 4095, PCR 256 or 258. Service Name should be set to CallSign. PMT PIDs 4000 – 4010 should not be used. Users are encouraged to experiment with higher-order DVB-S2 modes at lower symbol rates (for example 333 KS 32APSK) to conserve bandwidth for other users.
On Wednesdays (UTC time), experimenters are encouraged to try other modes – perhaps 6 MS using the whole transponder for brief (less than 10 minute) periods. It is essential that users to announce their plans on the chat room page, and to always monitor it.
The beacon will run 24/7
DATV Beacon DVB-S2 parameters:
- Center Frequency: 10.4915 MHz
- QPSK 4/5 FEC
- 1500 kSymbols
- RollOff = 0,25
- Pilots = off
- min. C/N = 4.6dB
- Datarate 2.383 MBit
Initial bandplan (will be revised after recent changes)
1. The maintenance uplink will only be used very occasionally, but users are requested to give it absolute priority when notified.
2. DVB-S2 users are requested to use the steepest roll-off that their equipment is capable of to reduce the possibility of adjacent channel interference.
3. Recommended spot frequencies for various usages and symbol rates are listed below
|Role||Symbol Rate||Uplink Freq||Downlink Freq||Designator||Notes|
|Beacon Narrow||1.5MS||10491.5||1MS1||DATV DVB-S2 BEACON|
|Simplex||1MS||2403.75||10493.25||1MS2||Only available outside beacon hours or when beacon is in narrow mode|
|Simplex||1MS||2405.25||10494.75||1MS3||Only available if 2MS2 not in use|
|Simplex||1MS||2406.75||10496.25||1MS4||Only available if 2MS2 not in use|
|Simplex||125KS||2407.625||10497.125||125KS1||Only available if 333KS1 not in use|
|Simplex||125KS||2407.875||10497.375||125KS2||Only available if 333KS1 not in use|
|Simplex||125KS||2408.125||10497.625||125KS3||Only available if 333KS2 not in use|
|Simplex||125KS||2408.375||10497.875||125KS4||Only available if 333KS2 not in use|
|Simplex||125KS||2408.625||10498.125||125KS5||Only available if 333KS3 not in use|
|Simplex||125KS||2408.875||10498.375||125KS6||Only available if 333KS3 not in use|
|Simplex||125KS||2409.125||10498.625||125KS7||Only available if 333KS4 not in use|
|Simplex||125KS||2409.375||10498.875||125KS8||Only available if 333KS4 not in use|
4. Uplink 2401.5 – 2409.5 RHCP, Downlink 10491 – 10499 Horizontal.