agaf-jhv 2007 wehningen, 5. mai 2007 - darren storer g7lwt: … wehningen... · 2008-01-02 · agaf...
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AGAF-JHV 2007Wehningen, 5. Mai 2007
D A T V-Development:
The Next Generation
Uwe E. Kraus DJ8DW , R 14
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Overview
- DATV: 3rd Generation
- DATV: 4th Generation
- Preparatory work for 4th Generation
- Block Diagram „DATV 4“
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MPEG-Coder 3rd Generation
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DATV-Exciter 3rd Generation
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70 cm to 23 cm/13 cm Up-Converter3rd Generation
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DVB-T Exciter3rd Generation
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GMSK Receiver: RF Part with two IF Amplifiers(2.5MHz, 6MHz)
3rd Generation
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GMSK Receiver: Digital Part with DVB-S Remodulator3rd Generation
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DATV – 4th Generation
Overview of Features
• Compatible with 3rd Generation• Monoboard Solution (MPEG-Coder, 70 cm-Exciter, DDS)• Program MUX (5 Programs)• 2 USB Interfaces (Large Memory and Laptop)• Programable for all digital Modulation Schemes• Parameters adjustable via Joystick/LC Display and/or PC-
Interface (Menu Guided )
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Preparation Work for 4th Generation
• 70 cm to 23 cm/13 cm/9 cm Up-Converter withSynthesizer, Joystick and LCD
• IF/70 cm Up-Converter according to SamplingMethod
• I/Q-Modulator for 70 cm/GHz Up-Conversion• MPEG Encoder with MUX• Exciter with USB Interfaces • MPEG Decoder
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70 cm to 23 cm/13 cm/9 cm Up-Converter withSynthesizer, Joystick und LCD
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IF to 70 cm Up-Converter: Sampling Method
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Spectrum at DAC Output
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70cm Exciter
Synthesizer
IQ-M
odul
ator
23cm/13cm/9cm
out
IQ-Mixer (70 cm to GHz Up-Converter)
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10
0
-10
-20
-30
-40
-50
-60
-7010-1 100 101
102
0
0.05
0.1
0.25
0.5
1
2
Phase error (degree)
Rej
ectio
n po
wer
ratio
(dB
)Amplitude error (dB)
IQ-Mixer: Influence of Amplitude- and Phaseimbalanceon Sideband Suppression
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70 cm Phasesplitter 0o/90o
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MPEG-Encoder4th Generation
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MPEG Decoder
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Ton 1
Ton 2
FBAS
y/c
+USB 210 14 Volt−
430 MHz /440 MHz out
USB 1−
110 MHz /120 MHz out
MPEG OUT
4 x MPEG IN
Joystick LCD
Powersupply
VideoSound MPEG
FPGA
IF
RFY/C
Sound2
CVBS
Sound1
„DATV 4“ Monoboard Solution