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Il satellite amatoriale in oggetto è l'ultimo della serie sat a bassa orbita (LEO)che vola un po' piu' in alto degli altri. Vi posso assicurare che gli apparati a bordo sono eccezionali, la qualità dell'audio non teme alcun confronto-pur in banda laterale;facilità di accesso con pochi watt.Ho fatti diversi qso utilizzando detto sat,ma, purtroppo, da qualche settimana,funziona solo il relativo beacon in CW su 435.790 +/- doppler.
Qui di seguito, alcune informazioni riprese dal sito web cinese "CAMSAT":
About XW-1
-----------------------------------------------------------------------------------------------------------------------------------------------
Satellite Type: Microsatellite
Apogee: 1200km
Perigee: 1200km
Inclination: 105
Period: 109
Local time of descending node: 21:30
Weight: 50kg
Dimension: Φ680mm×432mm
Mode V/U (J) FM Voice Repeater (30 dbm (1 w)):
Uplink: 145.8250 MHz FM, PL 67.0 Hz.
Downlink: 435.6750 MHz FM
Mode V/U (J) Linear Transponder (Inverting) (30 dbm (1 w)):
Uplink:145.9250 - 145.9750 MHz SSB/CW
Downlink:435.7650 - 435.7150 MHz SSB/CW
Mode V/U (J) PacSat BBS (30 dbm (1 w)):
Uplink:145.8250 MHz AFSK 1200 BPS
Downlink: 435.6750 MHz AFSK 1200 BPS
Mode Beacon (23 dbm (200mw)):
Downlink:435.7900 MHz CW
Sono certo che tra pochi giorni,il team cinese dell' HO68 riuscirà a breve a risolvere il problema,come ieri l'altro ha scritto BA1DU e che qui potete leggere,in quanto, a mio modestissimo avviso,se ne sente la mancanza in aria:
In this week I received many reports from all over the world about faults of HO-68
telemetry beacon. After we analyzed situation of the satellite, we think that
the software of payload management MPU was not running properly, the communication
of onboard data bus between payload management MPU and the satellite management
unit was stopped because of the software crashes. It led to the beacon problem
and abnormal switch of transponder.
Today we switched the satellite into safety mode at 0300Z , turn off most of onboard
units, and then we re-powered up at 0440Z, the satellite was back to normal operating
mode, so far the beacon operates normally.
We will not upload command to the satellite for transponder operating skeds of next
week, we will monitor continually in next week. Please send your report if you find
any abnormal operation of HO-68.
73!
Alan Kung, BA1DU
HO-68(XW-1) Project Manager
www.camsat.cn
Poi,dal sito web inglese SOUTH GATE Amateur Radio Club si può anche vedere qualche commento sull ' HO 68:
HO-68, also known as Xi Wang 1 (Hope 1), was launched on December 15. It's linear transponder is proving very popular and provided hundreds of SSB and CW contacts over the Christmas-New Year holiday period.
Due to Doppler shift the CW beacon can appear to be up to +/- 9 kHz from its nominal frequency of 435.790 MHz and you need to tune your receiver to follow it during the pass. The beacon has been received on simple antennas such as a ¼ wave ground plane but for best results try a small yagi with about 8 elements.
To reduce the effects of Doppler the SSB transponder is inverting. This means that a LSB signal on the uplink becomes a USB signal on the downlink. You don’t need much power to work through the satellite, many contacts have been made using 5 watts output. Always use the lowest power possible and ensure your downlink signal is never stronger than the beacon.
Su DCARR potremo seguire l'evolversi della situazione e poi,insieme, ci scambieremo le nostre idee su detto satellite,ovviamente utilizzandolo,almeno in ascolto...vedremo che non sarà necessario correre velocemente con le antenne dietro al satellite, specialmente per chi come me,non ha l'inseguimento automatico via software, ma va ancora con i "pedali" hi!!Ma io so che i7phh, se vuole dirlo lui, ha in serbo buone notizie sul blocco unico rotori (AZ. e Ze via soft.).. aspettiamo..
73' e buona domenica ! Michele dal Salento.
Qui di seguito, alcune informazioni riprese dal sito web cinese "CAMSAT":
About XW-1
-----------------------------------------------------------------------------------------------------------------------------------------------
Satellite Type: Microsatellite
Apogee: 1200km
Perigee: 1200km
Inclination: 105
Period: 109
Local time of descending node: 21:30
Weight: 50kg
Dimension: Φ680mm×432mm
Mode V/U (J) FM Voice Repeater (30 dbm (1 w)):
Uplink: 145.8250 MHz FM, PL 67.0 Hz.
Downlink: 435.6750 MHz FM
Mode V/U (J) Linear Transponder (Inverting) (30 dbm (1 w)):
Uplink:145.9250 - 145.9750 MHz SSB/CW
Downlink:435.7650 - 435.7150 MHz SSB/CW
Mode V/U (J) PacSat BBS (30 dbm (1 w)):
Uplink:145.8250 MHz AFSK 1200 BPS
Downlink: 435.6750 MHz AFSK 1200 BPS
Mode Beacon (23 dbm (200mw)):
Downlink:435.7900 MHz CW
Sono certo che tra pochi giorni,il team cinese dell' HO68 riuscirà a breve a risolvere il problema,come ieri l'altro ha scritto BA1DU e che qui potete leggere,in quanto, a mio modestissimo avviso,se ne sente la mancanza in aria:
In this week I received many reports from all over the world about faults of HO-68
telemetry beacon. After we analyzed situation of the satellite, we think that
the software of payload management MPU was not running properly, the communication
of onboard data bus between payload management MPU and the satellite management
unit was stopped because of the software crashes. It led to the beacon problem
and abnormal switch of transponder.
Today we switched the satellite into safety mode at 0300Z , turn off most of onboard
units, and then we re-powered up at 0440Z, the satellite was back to normal operating
mode, so far the beacon operates normally.
We will not upload command to the satellite for transponder operating skeds of next
week, we will monitor continually in next week. Please send your report if you find
any abnormal operation of HO-68.
73!
Alan Kung, BA1DU
HO-68(XW-1) Project Manager
www.camsat.cn
Poi,dal sito web inglese SOUTH GATE Amateur Radio Club si può anche vedere qualche commento sull ' HO 68:
HO-68, also known as Xi Wang 1 (Hope 1), was launched on December 15. It's linear transponder is proving very popular and provided hundreds of SSB and CW contacts over the Christmas-New Year holiday period.
Due to Doppler shift the CW beacon can appear to be up to +/- 9 kHz from its nominal frequency of 435.790 MHz and you need to tune your receiver to follow it during the pass. The beacon has been received on simple antennas such as a ¼ wave ground plane but for best results try a small yagi with about 8 elements.
To reduce the effects of Doppler the SSB transponder is inverting. This means that a LSB signal on the uplink becomes a USB signal on the downlink. You don’t need much power to work through the satellite, many contacts have been made using 5 watts output. Always use the lowest power possible and ensure your downlink signal is never stronger than the beacon.
Su DCARR potremo seguire l'evolversi della situazione e poi,insieme, ci scambieremo le nostre idee su detto satellite,ovviamente utilizzandolo,almeno in ascolto...vedremo che non sarà necessario correre velocemente con le antenne dietro al satellite, specialmente per chi come me,non ha l'inseguimento automatico via software, ma va ancora con i "pedali" hi!!Ma io so che i7phh, se vuole dirlo lui, ha in serbo buone notizie sul blocco unico rotori (AZ. e Ze via soft.).. aspettiamo..
73' e buona domenica ! Michele dal Salento.
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