Acrodyne NW8201E DIGITAL TELEVISION BROADCAST TRANSMITTER User Manual 32 NV8202 26 04 06 01 00

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Document ID	864559
Application ID	vnwefxrVtvE1edbLlVsrmQ==
Document Description	Users Manual Part 7
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	84.31kB (1053923 bits)
Date Submitted	2007-11-06 00:00:00
Date Available	2008-01-18 00:00:00
Creation Date	2007-11-02 12:21:13
Producing Software	Acrobat Distiller 5.0.5 (Windows)
Document Lastmod	2007-11-02 12:21:44
Document Title	32 NV8202-26.04.06-01.00.book
Document Creator	FrameMaker 7.0
Document Author:	HUPFAUER

Chapter 2
1.5.2
Design and Characteristics
Amplifier
Fig. 22 Amplifier
The air-cooled, broadband VM8350A1 amplifier operates in the range from 170 MHz to
254 MHz (VHF band III). It can be used both for analog and digital signals without requiring any adjustments. The output power of an amplifier is 325 W in the case of digital TV.
The amplifiers amplify the exciter signals distributed by the splitter and forward them to the
combiner. The amplifiers in a transmitter rack are controlled via the rack controller. Measured values and status information are recorded by the rack controller via CAN bus and
forwarded to the NETCCUÂŽ transmitter control unit. The number of exciters in the transmitter depends on the transmit power.
Note
2099.9595.72
For detailed information about the amplifier, refer to the amplifier manual.
- 2.18 -
E-2
Chapter 2
1.5.3
Design and Characteristics
Combiner
Fig. 23 Combiner (1) with splitter (2)
The RF power output by the amplifiers is merged via the combiner.
The combiner consists of a cascade of 3 dB couplers housed in a single unit.
2099.9595.72
- 2.19 -
E-2
Chapter 2
1.5.4
Design and Characteristics
Absorber
Fig. 24 Absorber
The absorber functions as the absorber resistor for the combiner. If combiner operation is
not symmetrical (e.g. one or more amplifiers are disconnected or removed), the portion of
the RF power that cannot be coupled in is expelled as additional thermal energy via the
transmitter's exhaust system.
2099.9595.72
- 2.20 -
E-2

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