AGAF-JHV 2007Wehningen, 5. Mai 2007

D A T V-Development:

The Next Generation

Uwe E. Kraus DJ8DW , R 14

AGAF JHV07DJ8DW

2 2

Overview

- DATV: 3rd Generation

- DATV: 4th Generation

- Preparatory work for 4th Generation

- Block Diagram „DATV 4“

AGAF JHV07DJ8DW

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MPEG-Coder 3rd Generation

AGAF JHV07DJ8DW

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DATV-Exciter 3rd Generation

AGAF JHV07DJ8DW

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70 cm to 23 cm/13 cm Up-Converter3rd Generation

AGAF JHV07DJ8DW

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DVB-T Exciter3rd Generation

AGAF JHV07DJ8DW

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GMSK Receiver: RF Part with two IF Amplifiers(2.5MHz, 6MHz)

3rd Generation

AGAF JHV07DJ8DW

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GMSK Receiver: Digital Part with DVB-S Remodulator3rd Generation

AGAF JHV07DJ8DW

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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 )

AGAF JHV07DJ8DW

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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

AGAF JHV07DJ8DW

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70 cm to 23 cm/13 cm/9 cm Up-Converter withSynthesizer, Joystick und LCD

AGAF JHV07DJ8DW

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IF to 70 cm Up-Converter: Sampling Method

AGAF JHV07DJ8DW

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Spectrum at DAC Output

AGAF JHV07DJ8DW

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70cm Exciter

Synthesizer

IQ-M

odul

ator

23cm/13cm/9cm

out

IQ-Mixer (70 cm to GHz Up-Converter)

AGAF JHV07DJ8DW

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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

AGAF JHV07DJ8DW

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70 cm Phasesplitter 0o/90o

AGAF JHV07DJ8DW

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MPEG-Encoder4th Generation

AGAF JHV07DJ8DW

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MPEG Decoder

AGAF JHV07DJ8DW

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AGAF JHV07DJ8DW

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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