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Es′hail QO-100

The satellite was launched into space with a Falcon 9 rocket on November 15, 2018. It was created in a cooperation of the Es′hailSat Qatar Satellite Company, the Qatar Amateur Radio Society (QARS) and the AMSAT-DL e.V.

″Es′hail″ is the Arabic name for the star Canopus. It is the second brightest star in the night sky after Sirius.

The AMSAT P4-A satellite has two transponders, a narrow-band transpoder with 500 kHz for all operating modes such as CW, SSB, RTTY, SSTV, etc. up to a maximum bandwidth of 2700 Hz and a wide-band transponder (8 MHz) for digital amateur radio television (DATV) in DVB -S2. The upload takes place in the 13cm band and the downlink in the 3cm band.

For radio operation, in SSB mode, is a parabolic dish with a diameter of 80cm and a transmission power of around 3 watts E.R.I.P. perfectly.

The frequency 10.48986 GHz downlink or 2.40036 GHz uplink is reserved as an emergency radio frequency on the narrowband transponder and must be kept free for emergency radio.

After successful tests, the satellite was assigned the OSCAR number 100 by AMSAT-NA on February 3, 2019, so that the satellite now bears the designation "Qatar-OSCAR 100" or QO-100.

Source: https://de.wikipedia.org/wiki/Es'hail-2

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Note! The current band plan can be found at: https://amsat-dl.org

Station description

Here the software ″Console″ (Simon Brown / G4ELI) for operation via QO-100. The downlink consists of a satellite dish of the company Kathrein, Germany (CAS90), a modified quad-LNB (Golden Media) of DJ4ZZ and the SDR RSPduo. The uplink takes place via a second SAT dish from Kathrein (CAS90), a helix-feed, a UP converter from Kuhne electronic and a ICOM IC-7400. This would theoretically allow undisturbed radio operation in duplex mode via QO-100! This leaves me the opportunity to get the absolute maximum profit from the up-/downlink. This could be necessary if I do not get my special permit extended with 1.5 watts and then have to get by with a maximum transmission power of 100mW here i sweden.

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QO-100 Telemetry data

Anyone who has ever listened to the NB transponder would naturally like to read out the data from the PSK beacon sooner or later. I have successfully done this here using the AO40Rcv software.

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Calculations

What transmission power do you really need for an SSB QSO via satellite?

According to my observations, a transmission power of 1.5 to 3 watts on an 80cm offset dish is sufficient for a normal SSB QSO via QO-100.

Below various satellite dishes in comparison.

For my calculation example I use 3 watts ≙ EIRP 378 watts on an 80cm satellite dish as a basis. In my calculations I am of an effectiveness = dish efficiency (k) of 31% at 2400MHz, usual on a satellite TV dish.

60cm SAT-dish

0.6m dish plus 0.1 watts and 18.5dBi@2400MHz = EIRP 7.1 watts
0.6m dish plus 1 watts and 18.5dBi@2400MHz = EIRP 71 watts
0.6m dish plus 2 watts and 18.5dBi@2400MHz = EIRP 142 watts
0.6m dish plus 3 watts and 18.5dBi@2400MHz = EIRP 212 watts
0.6m dish plus 4 watts and 18.5dBi@2400MHz = EIRP 283 watts
0.6m dish plus 5 watts and 18.5dBi@2400MHz = EIRP 354 watts
0.6m dish plus 10 watts and 18.5dBi@2400MHz = EIRP 707 watts
0.6m dish plus 15 watts and 18.5dBi@2400MHz = EIRP 1062 watts
0.6m dish plus 20 watts and 18.5dBi@2400MHz = EIRP 1416 watts

80cm SAT-dish

0.8m dish plus 0.1 Watt and 21dBi@2400MHz = EIRP 12.6 watts
0.8m dish plus 1 watts and 21dBi@2400MHz = EIRP 126 watts
0.8m dish plus 2 watts and 21dBi@2400MHz = EIRP 252 watts
0.8m dish plus 3 watts and 21dBi@2400MHz = EIRP 378 watts
0.8m dish plus 4 watts and 21dBi@2400MHz = EIRP 504 watts
0.8m dish plus 5 watts and 21dBi@2400MHz = EIRP 629 watts
0.8m dish plus 10 watts and 21dBi@2400MHz = EIRP 1259 watts
0.8m dish plus 15 watts and 21dBi@2400MHz = EIRP 1888 watts
0.8m dish plus 20 watts and 21dBi@2400MHz = EIRP 2518 watts

90cm SAT-dish

0.9m dish plus 0.1 watts and 22dBi@2400MHz = EIRP 15.8 watts
0.9m dish plus 1 watts and 22dBi@2400MHz = EIRP 158 watts
0.9m dish plus 2 watts and 22dBi@2400MHz = EIRP 317 watts
0.9m dish plus 2.4 watts and 22dBi@2400MHz = EIRP 380 watts
0.9m dish plus 3 watts and 22dBi@2400MHz = EIRP 475 watts
0.9m dish plus 4 watts and 22dBi@2400MHz = EIRP 634 watts
0.9m dish plus 5 watts and 22dBi@2400MHz = EIRP 792 watts
0.9m dish plus 10 watts and 22dBi@2400MHz = EIRP 1585 watts
0.9m dish plus 15 watts and 22dBi@2400MHz = EIRP 2377 watts
0.9m dish plus 20 watts and 22dBi@2400MHz = EIRP 3170 watts

100cm SAT-dish

1.0m dish plus 0.1 mW and 23dBi@2400MHz = EIRP 20 watts
1.0m dish plus 1 watts and 23dBi@2400MHz = EIRP 199 watts
1.0m dish plus 2 watts and 23dBi@2400MHz = EIRP 399 watts
1.0m dish plus 3 watts and 23dBi@2400MHz = EIRP 599 watts
1.0m dish plus 4 watts and 23dBi@2400MHz = EIRP 798 watts
1.0m dish plus 5 watts and 23dBi@2400MHz = EIRP 998 watts
1.0m dish plus 10 watts and 23dBi@2400MHz = EIRP 1995 watts
1.0m dish plus 15 watts and 23dBi@2400MHz = EIRP 2993 watts
1.0m dish plus 20 watts and 23dBi@2400MHz = EIRP 3990 watts

120cm SAT-dish

1.2m dish plus 0.1 mW and 24.5dBi@2400MHz = EIRP 28.2 watts
1.2m dish plus 1 watts and 24.5dBi@2400MHz = EIRP 282 watts
1.2m dish plus 1.3 watts and 24.5dBi@2400MHz = EIRP 366 watts
1.2m dish plus 2 watts and 24.5dBi@2400MHz = EIRP 564 watts
1.2m dish plus 3 watts and 24.5Bi@2400MHz = EIRP 845 watts
1.2m dish plus 4 watts and 24.5dBi@2400MHz = EIRP 1127 watts
1.2m dish plus 5 watts and 24.5dBi@2400MHz = EIRP 1409 watts
1.2m dish plus 10 watts and 24.5dBi@2400MHz = EIRP 2818 watts
1.2m dish plus 15 watts and 24.5dBi@2400MHz = EIRP 4228 watts
1.2m dish plus 20 watts and 24.5dBi@2400MHz = EIRP 5637 watts

150cm SAT-dish

1.5m dish plus 0.1 mW and 26.5dBi@2400MHz = EIRP 44.7 watts
1.5m dish plus 0.8 watts and 26.5dBi@2400MHz = EIRP 357 watts
1.5m dish plus 1 watts and 26.5dBi@2400MHz = EIRP 447 watts<
1.5m dish plus 2 watts and 26.5dBi@2400MHz = EIRP 893 watts
1.5m dish plus 3 watts and 26.5Bi@2400MHz = EIRP 1340 watts
1.5m dish plus 4 watts and 26.5dBi@2400MHz = EIRP 1787 watts
1.5m dish plus 5 watts and 26.5dBi@2400MHz = EIRP 2233 watts
1.5m dish plus 10 watts and 26.5dBi@2400MHz = EIRP 4467 watts
1.5m dish plus 15 watts and 26.5dBi@2400MHz = EIRP 6700 watts
1.5m dish plus 20 watts and 26.5dBi@2400MHz = EIRP 8934 watts

180cm SAT-dish

1.8m dish plus 0.1 watts and 28dBi@2400MHz = EIRP 63.1 watts
1.8m dish plus 0.6 watts and 28dBi@2400MHz = EIRP 379 watts
1.8m dish plus 1 watts and 28dBi@2400MHz = EIRP 631 watts
1.8m dish plus 2 watts and 28dBi@2400MHz = EIRP 1262 watts
1.8m dish plus 3 watts and 28dBi@2400MHz = EIRP 1893 watts
1.8m dish plus 4 watts and 28dBi@2400MHz = EIRP 2523 watts
1.8m dish plus 5 watts and 28dBi@2400MHz = EIRP 3155 watts
1.8m dish plus 10 watts and 28dBi@2400MHz = EIRP 6310 watts
1.8m dish plus 15 watts and 28dBi@2400MHz = EIRP 6495 watts
1.8m dish plus 20 watts and 28dBi@2400MHz = EIRP 12619 watts

240cm SAT-dish

2.4m dish plus 0.1 watts and 30.5dBi@2400MHz = EIRP 112.2 watts
2.4m dish plus 0.3 watts and 30.5dBi@2400MHz = EIRP 337 watts
2.4m dish plus 1 watts and 30.5dBi@2400MHz = EIRP 1122 watts
2.4m dish plus 2 watts and 30.5dBi@2400MHz = EIRP 2244 watts
2.4m dish plus 3 watts and 30.5dBi@2400MHz = EIRP 3366 watts
2.4m dish plus 4 watts and 30.5dBi@2400MHz = EIRP 4488 watts
2.4m dish plus 5 watts and 30.5dBi@2400MHz = EIRP 5610 watts
2.4m dish plus 10 watts and 30.5dBi@2400MHz = EIRP 11220 watts
2.4m dish plus 15 watts and 30.5dBi@2400MHz = EIRP 16830 watts
2.4m dish plus 20 watts and 30.5dBi@2400MHz = EIRP 22440 watts

300cm SAT-dish

3.0m dish plus 0.1 watts and 32.5dBi@2400MHz = EIRP 177.8 watts
3.0m dish plus 0.2 watts and 32.5dBi@2400MHz = EIRP 356 watts
3.0m dish plus 1 watts and 32.5dBi@2400MHz = EIRP 1778 watts
3.0m dish plus 2 watts and 32.5dBi@2400MHz = EIRP 3557 watts
3.0m dish plus 3 watts and 32.5dBi@2400MHz = EIRP 5335 watts
3.0m dish plus 4 watts and 32.5dBi@2400MHz = EIRP 7113 watts
3.0m dish plus 5 watts and 32.5dBi@2400MHz = EIRP 8891 watts
3.0m dish plus 10 watts and 32.5dBi@2400MHz = EIRP 17783 watts
3.0m dish plus 15 watts and 32.5dBi@2400MHz = EIRP 26674 watts
3.0m dish plus 20 watts and 32.5dBi@2400MHz = EIRP 35566 watts

340cm SAT-dish

3.4m dish plus 0.1 watts and 33.5dBi@2400MHz = EIRP 223.9 watts
3.4m dish plus 0.16 watts and 33.5dBi@2400MHz = EIRP 358 watts
3.4m dish plus 1 watts and 33.5dBi@2400MHz = EIRP 2239 watts
3.4m dish plus 2 watts and 33.5dBi@2400MHz = EIRP 4477 watts
3.4m dish plus 3 watts and 33.5dBi@2400MHz = EIRP 6716 watts
3.4m dish plus 4 watts and 33.5dBi@2400MHz = EIRP 8955 watts
3.4m dish plus 5 watts and 33.5dBi@2400MHz = EIRP 11194 watts
3.4m dish plus 10 watts and 33.5dBi@2400MHz = EIRP 22387 watts
3.4m dish plus 15 watts and 33.5dBi@2400MHz = EIRP 33581 watts
3.4m dish plus 20 watts and 33.5dBi@2400MHz = EIRP 44774 watts

400cm SAT-dish

4.0m dish plus 0.1 watts and 35dBi@2400MHz = EIRP 316.2 watts
4.0m dish plus 0.12 watts and 35dBi@2400MHz = EIRP 379 watts
4.0m dish plus 1 watts and 35dBi@2400MHz = EIRP 3162 watts
4.0m dish plus 2 watts and 35dBi@2400MHz = EIRP 6325 watts
4.0m dish plus 3 watts and 35dBi@2400MHz = EIRP 9487 watts
4.0m dish plus 4 watts and 35dBi@2400MHz = EIRP 12649 watts
4.0m dish plus 5 watts and 35dBi@2400MHz = EIRP 15811 watts
4.0m dish plus 10 watts and 35dBi@2400MHz = EIRP 31623 watts
4.0m dish plus 15 watts and 35dBi@2400MHz = EIRP 47434 watts
4.0m dish plus 20 watts and 35dBi@2400MHz = EIRP 63246 watts

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