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GSM/3G Repeaters

GSM Repeaters

GSM Amplifier/Repeater SIGNAL GSM-305
Code: A6765
Price w/o taxPriceDisc.Validity  
358.81 EUR358.81 EUR0 %
GSM Amplifier/Repeater SIGNAL GSM-305
Top view

GSM Amplifier/Repeater SIGNAL GSM-305
General view - connectors

GSM Amplifier/Repeater SIGNAL GSM-305
Bottom view
GSM Amplifier/Repeater SIGNAL GSM-305
The included accessories
The unit comes with a two-year warranty.
Signal GSM-305 A6765 repeater amplifies GSM signals inside buildings. The device is ideal for locations where the range of a cellular network allows for use of mobile phones out of buildings, but is insufficient for indoor operation. Such locations include some remote places (long distances to base stations), but more often rooms in old buildings with thick walls or in basements and cellars (e.g. pubs, coffee shops). A strong barrier can also be modern windows with panes covered with metallic layers.
The SIGNAL GSM-305 repeater is among the first devices that amplify the whole GSM+EGSM frequency range and comply with ETSI 300 609-4 standard that is the basis for CE declaration. The evidence of compliance with all required standards has been issued by the National Institute of Telecommunications in Warsaw, Poland.
Distinguishing features:
  • Support for GSM networks (GSM+EGSM) - 880-960 MHz;
  • Compliance with ETSI 300 609-4 required for this kind of devices;
  • AGC (ALC) - automatic gain/level control;
  • MGC - manual gain control (attenuator);
  • Gain suitable for the coverage area;
  • Indoor coverage area up to 300 m2;
  • Easy installation (Plug and Play);
  • The packaging does not contain an outdoor antenna (it should be selected depending on signal level - usually A741030, sometimes A7018 or A7028);
  • 24-month warranty.
Contents of the set:
  • Main unit,
  • Special bracket for mounting the device,
  • User manual (in English),
  • Power supply.
This product can solve the problem of low signal in hotels, boardinghouses, and various buildings, allowing to use cellular phones for calls and Internet access.
Important features:
Extended operating band. The GSM repeater amplifies signals of the "old" GSM band and new EGSM band that has been introduced to increase the number of operators. The total frequency range of the device covers 880-915 MHz and 925-960 MHz bands.
ALC function. Automatic level control automatically adjusts gain of the device within range of 20 dB. It will not allow to overdrive the internal amplifier in the case of input signal fluctuations.
Adjustable input attenuation The built-in attenuator allows to adjust the optimum level of the input signal (attenuation 0-31 dB, step 1 dB).
Additional information on the new repeaters is available here.
Installation of the Signal GSM-305 A6765 repeater:
  • find a place outside building with a good GSM signal,
  • mount the outdoor antenna (usually A741030) so that it is directed towards GSM base station,
  • choose a location for installing the repeater somewhere inside the building to place the indoor antenna in the central part of the building/hall/room to be covered,
  • check if the distance to the place outside is not longer than 10 m (longer distances are not recommended due to power loss),
  • install the Signal GSM-305 repeater in the suitable place in the hall/room (away from heaters etc., ensuring natural ventilation),
  • be sure that the antennas are connected to the dedicated, marked sockets,
  • connect the AC power plug to a wall outlet (230 VAC).
Signal GSM-305 A6765 repeater connects with both antennas via coaxial cables. It usually provides enough flexibility to place the device near an AC power socket.
The notified body under Directive 1999/5/EC (identification number 1471) - the National Institute of Telecommunications in Warsaw, Poland - has issued Confirmation of Conformity with essential requirements of applicable European Directives.
The Confirmation of Conformity issued by the National Institute of Telecommunications in Warsaw, Poland
EC Declaration of Conformity for GSM-305 A6765
Tests conducted in November 2010 by Centralne Laboratorium Badan Technicznych (Central Laboratory of Technical Research), at the request of the Office of Electronic Communications in Poland, confirmed that the model SIGNAL GSM-305 meets the requirements of PN-ETSI EN 300 609-4 v.8.0.2:2005 standard in the scope: spurious emissions, transmitter intermodulation attenuation, gain outside the operating band.
Below there is an example of using the repeater for better cellular coverage in a home.
Typical application

NameRepeater SIGNAL GSM-305
Operating bands [MHz]880-915
Output power [dBm]10
Gain [dB]60/60
Max group delay [ μs]0.5
Input attenuation (adj. manually) [dB]0-31 (step 1)
AGC range [dB]up to 20
Indoor coverage area [m2]up to 300
Impedance [Ω]50
100-240 VAC (2 A)
9 VDC (3 A)
(ETSI 300 609 -4), RoHS
Dimensions [mm]218x155x65
Antenna connectors (for outdoor/indoor antenna)N-f/N-f


SIGNAL repeaters is a series of devices that amplify cellular signals in buildings. These professional devices are characterized by high quality and very good stability.
SIGNAL repeaters meet all requirements concerning the legality of their installation and use. All the devices are supplied with CE certificates and fulfill the required standards.
Repeaters made to order
We also offer selective GSM repeaters for GSM operators.

To evaluate the price of such a repeater, we need the necessary technical specifications:
  • frequency range: 400 MHz to 2700 MHz. A single repeater can amplify multiple channels, also with spacing.
  • gain:10 dB to 85 dB
  • output power: 1...27 dBm
  • connectors: SMA or N
Please send your inquiries to our customer service.
Price w/o taxPriceDisc.Validity  
358.81 EUR358.81 EUR0 %
GSM Amplifier/Repeater SIGNAL GSM-305
Code: A6765