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VARAHF Zugangs Mode Winlink Express - OE3XEC Forum

VARAHF Zugangs Mode Winlink Express

Fragen und Diskussionen rund um RMS Gateways

Moderatoren: oe3vrw, oe3fqu

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oe3fqu
Beiträge: 69
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VARAHF Zugangs Mode Winlink Express

Beitragvon oe3fqu » Di 13. Mär 2018, 10:21

Dateianhänge
VARAHF Soundcard & Drive Level Setting.jpg
VARAHF Soundcard & Drive Level Setting.jpg (140.28 KiB) 14914 mal betrachtet
VARA TNC Setup _Liz & Retries.jpg
VARA TNC Setup _Liz & Retries.jpg (24.3 KiB) 14942 mal betrachtet
IC-7200 RADIO Setup.jpg
IC-7200 RADIO Setup.jpg (92.35 KiB) 14942 mal betrachtet
VARA TNC Setup _norm.jpg
VARA TNC Setup _norm.jpg (23.2 KiB) 14942 mal betrachtet

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oe3fqu
Beiträge: 69
Registriert: Mo 9. Feb 2015, 08:41
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VARAHF Speed Level zu gering ?

Beitragvon oe3fqu » Sa 25. Apr 2020, 22:25

In der Praxis haben sich einigen Fragen zu den erreichbaren SL (Speed Levels) ergeben.
Die aktuelle VARAHF Speed Level Tabelle v4.0.x.x

VARA HF SpeedLevel Table.jpg
VARA HF SpeedLevel Table.jpg (332.22 KiB) 4106 mal betrachtet


Bitte überprüfe, ob die Filter Bandbreite des Empfängers weit genug eingestellt ist, um alle Töne (Träger) des VARA Signales durchzulassen.
Die Durchlass Bandbreiten sind je nach Gerät etwas unterschiedlich.
Wie man im Bild sieht, 200Hz bis 2800 Hz würden gut passen,
die roten vertikalen Stiche geben an, welche Bandbreite VARA HF benötigt um das volle OFDM Spectrum ausnützen zu können.

Bandbreiten Einstellung des RX.jpg
Bandbreiten Einstellung des RX.jpg (597.93 KiB) 14940 mal betrachtet


Ganz wichtig ist auch, den PEGEL des VU Meters zu beachten um eine Übersteuerung des Soundcard Einganges zu vermeiden.
Zu hoher Pegel vermindert das S/N und damit auch den SL (SpeedLevel)
Bei guter Kanalqualität und starkem Empfangs Signal ist es vorteilhaft, mit dem HF Regler (oder dem Attenuator) des RX den Pegel so einzustellen, daß der Zeiger des VU Meters maximal bis 12 Uhr (~ -25dB) ausschlägt.
Mit der Abschwächung des NUTZ HF Signales werden auch eventuelle Störungen abgeschwächt, das S/N Verhältnis wird besser, die Geschwindigkeit steigt.

VARA beim File Download vom Gateway OE3XEC (mp4 mit etwa 30 MB)

https://mega.nz/file/Qc8VAQ4T#r5dWK1ASa ... fRP-57V12k


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