GSM
Dual Duplex Tower Mounted Amplifier
for 900 MHz
With a Tower Mounted Amplifier (TMA) installed close Excellent reliability
to the antenna, the overall network performance and Reliability is one of the keys to network operator success
coverage is enhanced due to reduced system noise and is the most important feature of the TMAs produced
figure and improved uplink sensitivity. by Ericsson.
In addition the Dual Duplex TMA enables the operator The durable TMA has lightning protection, dual amplifiers
to benefit from the use of a common Rx/Tx feeder. and alarm functionality. A great deal of effort has been
concentrated on environmental tests to ensure a high
Improved operator business reliability.
When building new networks with TMAs the faster rollout
and the reduction of the initial investments, due to the Key features
less site requirement, can result in a 50% higher return • Optimized for, type approved and system verified
of investment within just three years. with RBS 2000
• Compact and easy to install
When improving existing network quality and coverage
• Excellent technical performance
by installing TMAs, the extra traffic generated provides a
typical payback time of 2–12 months, and increases the
net revenue.
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Technical specifications for Dual Duplex TMA for GSM 900
Dual Duplex Tower Mounted Amplifier Product number KRY 112 14
Electrical specifications
Bandwidth: 25 MHz
Receiver pass band: 890–915 MHz or 880–905 MHz
Transmitting pass band: 935–960 MHz or 925–950 MHz
Gain: 12 dB
Input IP3, better than: 12 dBm
Tx loss, typical: 0.5 dB
Tx/Rx Return Loss, typical: 17 dB
ANT Return Loss, typical: 17 dB
Noise figure, typical: 1.6 dB
Maximum power handling, continuous: 52 dBm (160 W)
All IM*/ in receiving band (2 x 43 dBm CW): < –121 dBm
DC powering / Alarm handling: Superimposed on the RF feeder. Dual alarm levels.
Impedance: 50 Ohm
Type approval: Ericsson TMA + BTS fulfils ETSI requirements
Mechanical specifications
Dimensions (H x W x D): 308 x 124 x 109 mm (12.1 x 4.9 x 4.3 in)
Weight: 5.5 kg (12.1 lb)
RF connectors: 7-16 female
Ground connector: M8 bolt & nut
Mounting: Pole or wall mounting
The production and the materials are environmentally approved. All specifications are subject to alteration without prior notice. Printed in Sweden. Tarle Decor AB. 12.2002
Environmental specifications
Temperature range, full performance: -35 °C to +55 °C (-31 °F to +130 °F)
MTBF: 750 000 hours
Sealing: IP 65
Lightning protection: IEC 1024
Safety: EN 60950 CE marking
Ordering numbers
Versions without LNA by-pass: KRY 112 14/10, /11
Versions with LNA by-pass: KRY 112 14/12, /13
Available ordering guides: EN/LZT 123 7475 and EN/LZT 123 7020
*/ Referring to IM5 / IM7 measured at the antenna port.
IM3 considered subject to frequency planning.
Ericsson AB AE/LZT 123 4056 R11
www.ericsson.com © Ericsson AB 2002
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