Transmission power

from Wikipedia, the free encyclopedia

The transmission power is the power of a transmitter in watts or dBm .

definition

There is no standard definition for the transmission power: it is defined as that

  • Power consumed by the transmitter (transmitter input power),
  • Output power of the power amplifier (transmitter output power) or
  • Radiated power (radiated power) relative to a reference antenna in the form of ERP , EIRP or EMRP .

In addition, in connection with the approval of a radio station or the allocation of a radio frequency or a frequency channel by the frequency administration , the definitions for performance in accordance with the Implementing Regulations for the Radio Service (VO Funk) of the International Telecommunication Union apply .

In terms of measurement technology, the transmission power of a band-limited signal results as an integral of the spectral power density or from the RMS value .

Typical transmit output powers

default Max. power
Short Range Devices 433 MHz 10 mW
WiFi 2.4 GHz / Bluetooth 100 mW
LTE cell phone 200 mW
UMTS TDD 125-250 mW
DECT 250 mW
WLAN 5 GHz 1 w
GSM 1800 mobile phone 1 w
GSM 900 mobile phone 2 w
CB radio in Germany 4 and 12 W.
GSM 1800 base station 10-20 W
GSM 900 base station 20-50 W
Amateur radio service
  • 750 W in Germany
  • 1 kW in Switzerland and Austria
  • 1.5 kW in the USA
VHF, VHF and UHF radio transmitters 100 kW
Long wave transmitter 1 MW = 10 6  W.
Pulse radar 100 MW
EMP weapons TW = 10 12  W.

For the transmission power of mobile phones see also: SAR value .

literature

  • Bernhard Walke: Cellular networks and their protocols 1st 3rd edition, Springer Fachmedien, Wiesbaden 2001, ISBN 978-3-663-05909-7 .
  • Martin Werner: Communication technology . Analog and digital processes with modern applications, Friedrich Vieweg & Sohn Verlag, Wiesbaden 2006, ISBN 3-528-04126-9 .
  • Martin Bossert: Introduction to communications technology. Oldenbourg, Munich 2012, ISBN 978-3-486-70880-6 .
  • Volker Jung, Hans-Jürgen Warnecke (Hrsg.): Handbook for telecommunications. Springer Verlag, Berlin / Heidelberg 1998, ISBN 978-3-642-97703-9 .

Individual evidence

  1. ↑ General allocation of frequencies for use in local networks; Wireless Local Area Networks (WLAN radio applications). In: Vfg 10/2013, changed with Vfg 64/2018. On Bundesnetzagentur.de, accessed on January 8, 2020 ( PDF ; 25 kB).
  2. ↑ Cell phone tariffs comparison: Which cell phone contract suits me? In: DSL tariffs comparison . ( schulprojekt-mobilfunk.de [PDF; accessed on June 27, 2018]).
  3. ↑ IEEE 802.11a / IEEE 802.11h / IEEE 802.11j (WLAN / 54 Mbit / 5 GHz). Accessed June 27, 2018 (German).
  4. ↑ Legally permitted transmission power for WLAN - wlan-skynet.de. Retrieved May 11, 2019 . (Not available on January 8, 2020.)
  5. ↑ General allocation of frequencies in the ranges 5150 MHz - 5350 MHz and 5470 MHz - 5725 MHz for radio applications for broadband data transmission, WAS / WLAN ("Wireless Access Systems including Wireless Local Area Networks"). In: Vfg. ​​151/2018. On Bundesnetzagentur.de, accessed on January 8, 2020 ( PDF ; 70 kB).

Web links