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Cellular Systems

GSM/3G Repeaters

New cellular amplifiers/repeaters compliant with the latest standards and legal requirements
Original Polish version by Lukasz Kopciuch
GSM repeaters
GSM repeater Signal GSM-305 A6765
GSM repeater Signal GSM-505 A6775
GSM repeater Signal GSM-1205 A6785
NameRepeater SIGNAL GSM-305Repeater SIGNAL GSM-505Repeater SIGNAL GSM-1205
Operating bands [MHz]880-915
Output power [dBm]101520
Gain [dB] UP/DL60/6065/6570/70
Max group delay [ μs]
Input attenuation (adj. manually) [dB]0-31 (step 1)0-31 (step 1)0-31 (step 1)
AGC range [dB]up to 20up to 20up to 20
Indoor coverage area [m2]3005001200
Impedance [Ω]505050
303 609), RoHS
303 609), RoHS
303 609), RoHS
Dimensions [mm]218x155x65218x155x65218x155x65
Antenna connectors (for outdoor/indoor antenna)


The new GSM amplifiers/repeaters from Signal series can be used
in all GSM networks
  • Extended operating band
    The appearance of additional frequency ranges (880-890 MHz, 925-935 MHz), extending the existing GSM900 band (890-915 MHz, 935-960 MHz), aims to increase competition in the market by assigning the frequencies to new mobile operators. The new band is called EGSM - Extended GSM.
    The lack of the new GSM band (880-890 MHz, 925-935 MHz) in GSM repeaters/amplifiers would eliminate the possibility of using cellular phones of the new operators (in the areas/buildings/rooms that do not guarantee proper connectivity without such boosters).
    Some cellular networks using EGSM band:
    • Poland:
      • Play
      • Aero2
    • Austria
      • One GmbH
    • Belgium
      • Base
    • Bulgaria
      • BTC Mobile EOOD
    • Czech republik
      • Telefónica O2
    • Denmark
      • Telia Nättjänster Norden AB
    • Estonia
      • EMT AS
      • Elisa Mobiilsideteen-used AS
      • Tele2 Eesiti AS
    • Holland
      • Orange
      • Telfort
    • Finland
      • Radiolinja Origo Oy
      • Sonera Mobile Networks Oy
      • DNA verkot Oy
    • France
      • Bouygues Telecom
    • Deutchland
      • E-PlusMobilfunk GmbH & Co KG
      • O2 (Germany) GmbH & Co OHG
    • Italy
      • TIM
    • Liechtenstein
      • Orange
    • Lithuania
      • Omnitel
      • Bite Litetuva
      • Tele2
    • Luxembourg
      • VoxMobile SA
    • Moldova
      • Eventis Mobile SA
    • Romania
      • Cosmote RMT
    • Slovakia
    • Telefonica O2
  • Spain
    • Telefonica Moviles
    • Orange
  • Swiss
    • TDC
    • Orange
  • Great Britain
    • 02
    • Vodafone
    To avoid such problems, DIPOL has introduced these new GSM repeaters that amplify the whole GSM and EGSM (880-915 MHz, 925-960 MHz) bands.
    GSM band consists of 124 channels, each 200 kHz wide. The channels are numbered from 1 to 124. The center frequency fn of n channel is determined by the formulas: fn=(890+n*0.2) MHz - for "upper" channels, fn=(935+n*0.2) MHz - for "lower" channels.
GSM channels
    EGSM, which uses 880-890 MHz and 925-935 MHz frequency ranges, includes additional 50 channels. They are numbered from 975 to 1023 according to the formula fn=[890+(n-1024)*0.2] MHz and fn=[935+(n-1024)*0.2] MHz, where fn is the center frequency of channel n (each 200 kHz wide).
EGSM channels
  • Compliance with RED 2014/53/EU directive and ETSI 303 609 standard
    Recently, European countries have tightened the regulations applicable to some wireless telecommunications equipment.
    Radio equipment launched on the market from June 13, 2016 to June 12, 2017 should meet the requirements of Directive 2014/53/EU or Directive 1999/5/EC. After June 12, 2017, all radio equipment being placed on the market or put into service must comply with the Directive 2014/53/EU
    Currently, the equipment must be tested for compliance with the following standards:
  • ETSI EN 300 609-4 V12.5.1 Digital cellular telecommunications system (Phase 2+); Base Station System (BSS) equipment specification; Part 4: Repeaters (3GPP TS 51.026 version 12.0.0 Release 12).
  • EN 60950-1:2006+A11:2009+A1:2010+A12:2011+A2:2013-. Security.
  • ETSI EN 301 489-1 V2.1.1 Electromagnetic compatibility and Radio Spectrum Matters (ERM); Electromagnetic Compatibility (EMC) standard for radio equipment and services
  • ETSI EN 301 489-50 V2.1.1 Electromagnetic Compatibility (EMC) standard for radio equipment and services; Part 50: Specific conditions for Cellular Communication Base Station (BS), repeater and ancillary equipment; Harmonised Standard covering the essential requirements of article 3.1(b) of Directive 2014/53/EU
  • EN 50385: 2002 Compliance of radio base stations and fixed terminal stations for wireless telecommunication systems
    Each of the above standards has to be listed in CE Declarations of Conformity issued by manufacturers or importers.
Declaration of Conformity with all obligatory directives and standards for A6765, A6775, A6785 amplifiers/repeaters
  • Adjustable input attenuation
    A serious problem during the installation of a GSM repeater is to ensure adequate signal level at the input of the amplifier. In the case of too weak or too strong signal, the system will not function properly (broken calls, problems to establish connections etc.).
    A convenient solution to this problem provides the built-in attenuator allowing to adjust the level of the input signal (attenuation 0-31 dB, step 1 dB). The approximate signal level is indicated by LEDs located on the front panel of the repeater.
  • Automatic Gain Control (AGC)
    As mentioned above, the input signal level is essential for stable operation of GSM repeaters. Of course, it can be adjusted manually when installing the system, but later, when a cellular operator increases output power of its base station, changes the transceiver or antenna, deploys a new base station etc, it would require another visit of the installer.
    To avoid this problem, the Signal repeaters distributed by DIPOL have been equipped with automatic gain control, which keeps the output signal level stable irrespective of input signal variations within 20 dBm range.
All these features make the new amplifiers/repeaters the products which meet all requirements in terms of functionality, and, what is even more important, in terms of European law (compliance with RED 2014/53/UE).