Here are the settings for you:
WB TRANSPONDER TESTS
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DD0KP Hallo Heiner,
mit Deinen Einstellungen kann ich den WB Beacon empfangen.
Der Versuch den WB Beacon mit dem AMSAT Empfangskonverter zu empfangen ist allerdings fehlgeschlagen. Die Carrier SR und Full Anzeigen leuchten zwar grün aber es erfolgt keine Demodulation. Ich wollte den AMSAT Empfangskonverter einsetzen da er die Spannungen 12V bzw. 18V für das LNB liefert. Hast Du Erfahrungen mit dem AMSAT Empfangskonverter?
73 Hans-Jochen -
Hallo Hans-Jochen,
also ich denke der AMSAT Emfangsmischer mischt die 742,5 MHz auf der Du ohne dem Mischer empfängst wieder hoch auf 1336,5 MHz.
[Blocked Image: https://amsat-dl.org/wp-content/uploads/2018/09/blockdiagram.png]
Also einfach bei Offset 0 Hz eintragen, bei Frequenz(kHz) 1336500 eintragen.
Gruß
Robert, DD4YR
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OMs, please use English.
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Hi, why I can see so strong noise floor for the WB tp but no video signals? can see the beacon but very weak.
Thank you.
Ed PY2RN -.-
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That is not the WB transponder noise floor, THAT is the AMSAT Beacon signal.
And the strenght looks ok for decoding
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That is not the WB transponder noise floor, THAT is the AMSAT Beacon signal.
And the strenght looks ok for decoding
Cool, I am happy now
Thanks. -
Today I've sucessfully transmited 333K 32APSK signal which was received (only) by Renny PE1ASH with his 3m dish.
I've done this test just to smile at: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.
from: https://amsat-dl.org/en/p4-a-w…and-operating-guidelines/
Power required for that signal was quite sick and reception on 0.9m dish was still impossible (mer 14 of mer 14.1 required).
I think I'm the only one who achieved this "333K 32APSK" goal
So please change guideliness: 32 APSK to 8PSK
(as 333K 16APSK needs power comparable with 2M beacon)
8PSK FEC 2/3 is really a maximum when there are so many stations that we care of bandwidth.
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Also It is worth to reconsider "overpower" message over 1M signals - making it absolute in scale (<7db) rather than relative to the beacon. -
We have done 32APSK before back in the early days but the problem with it is the high SNR and limits of phase noise. 16APSK is the more realistic limit. 33ks at 16APSK is quite watchable as long as the resolution is not too high. Better though to stick to 8PSK or QPSK and a slightly higher bandwidth.
