No cell phone signal - what can block cell phone signal

Mobile Signal Booster, Signal Booster Cell Phone Signal Booster Booster Amplifier Wireless Repeater  Pico-Repeater TE-930 933 935B   Brief Description: 900MHz Pico-Repeater is intended to strengthen the signal of 900MHz mobile phone in the buildings. Ideal for use in areas where the 900MHz signal is weak to cause Call dropout or Cant connection. The device improves the voice calls and data VOICE GPRS and EDGE (depends of the signal operator).   Features: *High system gains. *Full duplex and double-end design, external power supply, and convenient installation. *ALC technology with auto-steady function adopted. *Provide power indication and uplink and downlink indications. *With the amplified linear power, the inter-modulation an spuriousness are suppressed effectively. *The reliability conforms to GB6993-86 standards. *The electromagnetic compatibility conforms to ETS300 609-4 standards.   Applicable place: It can be applied in Building rooms there have weak signal of mobile.   Specification: Frequency Range: 1.TE-930B (Uplink:890-915MHz;  Downlink: 935-960MHz); Gain: TE-930B(Uplink)Gp≥70dB;    (Downlink) Gp≥75dB; Output Power: TE-930B ≥30dBm; Pass band ripple:≤4dB Guard band rejection:(BW-60dB）≤42MHz; （BW-70dB）≤45MHz; I/O impedance: 50Ω/N Connector I/O return loss:≤-10dB Noise figure:≤-8dB Intermodulation attenuation(Po=13dBm):≤-40dBc Transmission: ≤0.5μs Ambient:-10℃-50℃ Power supply: AC110-220V±10%   45-55Hz Size:148mm×106mm×33mm Reliability:To the GB6993-86 standard Electromagnetic:To the ETS300 694-4 standard Function: a) Power supply LED denote b) Export power LED denote Package contents: 1 pcs booster 1 set power supply 1 pcs user manual 1 set installation screws  

no cell phone signal

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