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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

I have 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, both synchronized with GPSDO. Unfortunately, the uplink to the QO100 with 1.5 watts does not work from my location! After many tests, I finished the experiments on December 1st, 2020!

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GPS Clock settings

SDR RSPduo

(SDR 24.0 MHz + UpConv. 10.0 MHz)
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LNB Golden Media

(RX QO-100 with IF = 1089.5 MHz - 1099.0 MHz)
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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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Weather conditions and QO-100

Since August 2020 I have had no problems receiving the QO-100 here in northern Sweden every day 24/7. Since October, the situation has changed dramatically. Depending on the weather, the reception conditions change within a few seconds! The signal strength of the beacons go of S9 by around 1-2 S or more levels back. The following is a screenshot from the console that shows the current SAT weather image and an audio sample from a CW and SSB QSO. A typical sign of "rainscatter". Rain showers, also known as rain cells by meteorologists, can be very effective forward and backward scatterers for signals in the GHz bands. Rain scatter affects all GHz bands. It is believed that the optimal bands are in the 5.7 GHz and 10 GHz range.

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09-Nov-2020 | 14:14Z | 10489.500000 MHz | CW | S8 (Low-Bake)
09-Nov-2020 | 14:10Z | 10489.505475 MHz | CW | S8
09-Nov-2020 | 14:11Z | 10489.821100 MHz | USB | S7

Calculation satellite dish

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

According to my observations, a transmission power of 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.

Note! W = watt, mW = milliwatt, kW = kilowatt, k = dish efficiency in percent

60cm SAT-dish (OA = Offset antenna) k=31%

0.6m OA plus 0.1 W and 18.5dBi@2400MHz = EIRP 7.1 W
0.6m OA plus 1 W and 18.5dBi@2400MHz = EIRP 71 W
0.6m OA plus 2 W and 18.5dBi@2400MHz = EIRP 142 W
0.6m OA plus 3 W and 18.5dBi@2400MHz = EIRP 212 W
0.6m OA plus 4 W and 18.5dBi@2400MHz = EIRP 283 W
0.6m OA plus 5 W and 18.5dBi@2400MHz = EIRP 354 W
0.6m OA plus 10 W and 18.5dBi@2400MHz = EIRP 707 W
0.6m OA plus 15 W and 18.5dBi@2400MHz = EIRP 1.1 kW
0.6m OA plus 20 W and 18.5dBi@2400MHz = EIRP 1.4 kW

80cm SAT-dish (OA = Offset antenna) k=31%

0.8m OA plus 0.1 W and 21dBi@2400MHz = EIRP 12.6 W
0.8m OA plus 1 W and 21dBi@2400MHz = EIRP 126 W
0.8m OA plus 2 W and 21dBi@2400MHz = EIRP 252 W
0.8m OA plus 3 W and 21dBi@2400MHz = EIRP 378 W
0.8m OA plus 4 W and 21dBi@2400MHz = EIRP 504 W
0.8m OA plus 5 W and 21dBi@2400MHz = EIRP 629 W
0.8m OA plus 10 W and 21dBi@2400MHz = EIRP 1.3 kW
0.8m OA plus 15 W and 21dBi@2400MHz = EIRP 1.9 kW
0.8m OA plus 20 W and 21dBi@2400MHz = EIRP 2.5 kW

90cm SAT-dish (OA = Offset antenna) k=31%

0.9m OA plus 0.1 W and 22dBi@2400MHz = EIRP 15.8 W
0.9m OA plus 1 W and 22dBi@2400MHz = EIRP 158 W
0.9m OA plus 2 W and 22dBi@2400MHz = EIRP 317 W
0.9m OA plus 2.4 W and 22dBi@2400MHz = EIRP 380 W
0.9m OA plus 3 W and 22dBi@2400MHz = EIRP 475 Watt
0.9m OA plus 4 W and 22dBi@2400MHz = EIRP 634 Watt
0.9m OA plus 5 W and 22dBi@2400MHz = EIRP 792 Watt
0.9m OA plus 10 W and 22dBi@2400MHz = EIRP 1.6 kW
0.9m OA plus 15 W and 22dBi@2400MHz = EIRP 2.4 kW
0.9m OA plus 20 W and 22dBi@2400MHz = EIRP 3.2 kW

100cm SAT-dish (OA = Offset antenna) k=31%

1.0m OA plus 0.1 W and 23dBi@2400MHz = EIRP 20 W
1.0m OA plus 1 W and 23dBi@2400MHz = EIRP 199 W
1.0m OA plus 2 W and 23dBi@2400MHz = EIRP 399 W
1.0m OA plus 3 W and 23dBi@2400MHz = EIRP 599 W
1.0m OA plus 4 W and 23dBi@2400MHz = EIRP 798 W
1.0m OA plus 5 W and 23dBi@2400MHz = EIRP 998 W
1.0m OA plus 10 W and 23dBi@2400MHz = EIRP 2.0 kW
1.0m OA plus 15 W and 23dBi@2400MHz = EIRP 3.0 kW
1.0m OA plus 20 W and 23dBi@2400MHz = EIRP 4.0 kW

120cm SAT-dish (OA = Offset antenna) k=31%

1.2m OA plus 0.1 W and 24.5dBi@2400MHz = EIRP 28.2 W
1.2m OA plus 1 W and 24.5dBi@2400MHz = EIRP 282 W
1.2m OA plus 1.3 W and 24.5dBi@2400MHz = EIRP 366 W
1.2m OA plus 2 W and 24.5dBi@2400MHz = EIRP 564 W
1.2m OA plus 3 W and 24.5Bi@2400MHz = EIRP 845 W
1.2m OA plus 4 W and 24.5dBi@2400MHz = EIRP 1.1 kW
1.2m OA plus 5 W and 24.5dBi@2400MHz = EIRP 1.4 kW
1.2m OA plus 10 W and 24.5dBi@2400MHz = EIRP 2.8 kW
1.2m OA plus 15 W and 24.5dBi@2400MHz = EIRP 4.2 kW
1.2m OA plus 20 W and 24.5dBi@2400MHz = EIRP 5.6 kW

150cm SAT-dish (OA = Offset antenna) k=31%

1.5m OA plus 0.1 W and 26.5dBi@2400MHz = EIRP 44.7 W
1.5m OA plus 0.8 W and 26.5dBi@2400MHz = EIRP 357 W
1.5m OA plus 1 W and 26.5dBi@2400MHz = EIRP 447 W<
1.5m OA plus 2 W and 26.5dBi@2400MHz = EIRP 893 W
1.5m OA plus 3 W and 26.5Bi@2400MHz = EIRP 1.3 kW
1.5m OA plus 4 W and 26.5dBi@2400MHz = EIRP 1.8 kW
1.5m OA plus 5 W and 26.5dBi@2400MHz = EIRP 2.2 kW
1.5m OA plus 10 W and 26.5dBi@2400MHz = EIRP 4.5 kW
1.5m OA plus 15 W and 26.5dBi@2400MHz = EIRP 6.7 kW
1.5m OA plus 20 W and 26.5dBi@2400MHz = EIRP 8.9 kW

180cm SAT-dish (OA = Offset antenna) k=31%

1.8m OA plus 0.1 W and 28dBi@2400MHz = EIRP 63.1 W
1.8m OA plus 0.6 W and 28dBi@2400MHz = EIRP 379 W
1.8m OA plus 1 W and 28dBi@2400MHz = EIRP 631 W
1.8m OA plus 2 W and 28dBi@2400MHz = EIRP 1.3 kW
1.8m OA plus 3 W and 28dBi@2400MHz = EIRP 1.9 kW
1.8m OA plus 4 W and 28dBi@2400MHz = EIRP 2.5 kW
1.8m OA plus 5 W and 28dBi@2400MHz = EIRP 3.1 kW
1.8m OA plus 10 W and 28dBi@2400MHz = EIRP 6.3 kW
1.8m OA plus 15 W and 28dBi@2400MHz = EIRP 6.5 kW
1.8m OA plus 20 W and 28dBi@2400MHz = EIRP 12.6 kW

240cm SAT-dish (OA = Offset antenna) k=31%

2.4m OA plus 0.1 W and 30.5dBi@2400MHz = EIRP 112.2 W
2.4m OA plus 0.3 W and 30.5dBi@2400MHz = EIRP 337 W
2.4m OA plus 1 W and 30.5dBi@2400MHz = EIRP 1.1 kW
2.4m OA plus 2 W and 30.5dBi@2400MHz = EIRP 2.2 kW
2.4m OA plus 3 W and 30.5dBi@2400MHz = EIRP 3.4 kW
2.4m OA plus 4 W and 30.5dBi@2400MHz = EIRP 4.5 kW
2.4m OA plus 5 W and 30.5dBi@2400MHz = EIRP 5.6 kW
2.4m OA plus 10 W and 30.5dBi@2400MHz = EIRP 11.2 kW
2.4m OA plus 15 W and 30.5dBi@2400MHz = EIRP 16.8 kW
2.4m OA plus 20 W and 30.5dBi@2400MHz = EIRP 22.4 kW

300cm SAT-dish (PA = Parabolic antenna) k=65%

3.0m PA plus 0.1 W and 35.7dBi@2400MHz = EIRP 371.5 W
3.0m PA plus 0.2 W and 35.7dBi@2400MHz = EIRP 743 W
3.0m PA plus 1 W and 35.7dBi@2400MHz = EIRP 3.7 kW
3.0m PA plus 2 W and 35.7dBi@2400MHz = EIRP 7.4 kW
3.0m PA plus 3 W and 35.7dBi@2400MHz = EIRP 11. kW
3.0m PA plus 4 W and 35.7dBi@2400MHz = EIRP 14.9 kW
3.0m PA plus 5 W and 35.7dBi@2400MHz = EIRP 18.6 kW
3.0m PA plus 10 W and 35.7dBi@2400MHz = EIRP 37.1 kW
3.0m PA plus 15 W and 35.7dBi@2400MHz = EIRP 55.7 kW
3.0m PA plus 20 W and 35.7dBi@2400MHz = EIRP 74.3 kW

340cm SAT-dish (PA = Parabolic antenna) k=65%

3.4m PA plus 80 mW and 36.7dBi@2400MHz = EIRP 374.2 W
3.4m PA plus 0.1 W and 36.7dBi@2400MHz = EIRP 468 W
3.4m PA plus 1 W and 36.7dBi@2400MHz = EIRP 4.7 kW
3.4m PA plus 2 W and 36.7dBi@2400MHz = EIRP 9.3 kW
3.4m PA plus 3 W and 36.7dBi@2400MHz = EIRP 14.0 kW
3.4m PA plus 4 W and 36.7dBi@2400MHz = EIRP 18.7 kW
3.4m PA plus 5 W and 36.7dBi@2400MHz = EIRP 23.4 kW
3.4m PA plus 10 W and 36.7dBi@2400MHz = EIRP 46.8 kW
3.4m PA plus 15 W and 36.7dBi@2400MHz = EIRP 70.2 kW
3.4m PA plus 20 W and 36.7dBi@2400MHz = EIRP 93.5 kW

400cm SAT-dish (PA = Parabolic antenna) k=65%

4.0m PA plus 60 mW and 38dBi@2400MHz = EIRP 378.6 W
4.0m PA plus 0.1 W and 38dBi@2400MHz = EIRP 631 W
4.0m PA plus 1 W and 38dBi@2400MHz = EIRP 6.3 kW
4.0m PA plus 2 W and 38dBi@2400MHz = EIRP 12.6 kW
4.0m PA plus 3 W and 38dBi@2400MHz = EIRP 18.9 kW
4.0m PA plus 4 W and 38dBi@2400MHz = EIRP 25.2 kW
4.0m PA plus 5 W and 38dBi@2400MHz = EIRP 31.5 kW
4.0m PA plus 10 W and 38dBi@2400MHz = EIRP 63.1 kW
4.0m PA plus 15 W and 38dBi@2400MHz = EIRP 94.6 kW
4.0m PA plus 20 W and 38dBi@2400MHz = EIRP 126.2 kW

450cm SAT-dish (PA = Parabolic antenna) k=65%

4.5m PA plus 45 mW and 39.2dBi@2400MHz = EIRP 374.3 W
4.5m PA plus 0.1 W and 39.2dBi@2400MHz = EIRP 832 W
4.5m PA plus 1 W and 39.2dBi@2400MHz = EIRP 8.3 kW
4.5m PA plus 2 W and 39.2dBi@2400MHz = EIRP 16.6 kW
4.5m PA plus 3 W and 39.2dBi@2400MHz = EIRP 24.9 kW
4.5m PA plus 4 W and 39.2dBi@2400MHz = EIRP 33.3 kW
4.5m PA plus 5 W and 39.2dBi@2400MHz = EIRP 41.6 kW
4.5m PA plus 10 W and 39.2dBi@2400MHz = EIRP 83.2 kW
4.5m PA plus 15 W and 39.2dBi@2400MHz = EIRP 124.8 kW
4.5m PA plus 20 W and 39.2dBi@2400MHz = EIRP 166.3 kW

500cm SAT-dish (PA = Parabolic antenna) k=65%

5.0m PA plus 35 mW and 40.1dBi@2400MHz = EIRP 358.2 W
5.0m PA plus 0.1 W and 40.1dBi@2400MHz = EIRP 1.0 kW
5.0m PA plus 1 W and 40.1dBi@2400MHz = EIRP 10.2 kW
5.0m PA plus 2 W and 40.1dBi@2400MHz = EIRP 20.5 kW
5.0m PA plus 3 W and 40.1dBi@2400MHz = EIRP 30.7 kW
5.0m PA plus 4 W and 40.1dBi@2400MHz = EIRP 40.9 kW
5.0m PA plus 5 W and 40.1dBi@2400MHz = EIRP 51.2 kW
5.0m PA plus 10 W and 40.1dBi@2400MHz = EIRP 102.3 kW
5.0m PA plus 15 W and 40.1dBi@2400MHz = EIRP 153.5 kW
5.0m PA plus 20 W and 40.1dBi@2400MHz = EIRP 204.7 kW

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1. Electronic forms, only LoTW / QRZ.COM!
2. eQSL, only via HAMLOG online cloud!
3. Received QSL via the bureau, also SWL, are confirmed!
4. QSL card direct! ONLY with a SAE and 3 USD! Otherwise, I send the QSL via bureau!
5. I do not accept any other online platform! Please don't ask!

NOTE! The postage from Sweden is 24 SEK!

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