435 Series

Image of 435 Series Mini Tower

435 Series, Mini Tower Top Amplifier System (TTA) is designed to enhance the operation of the base station. The TTA increases receive sensitivity, reduces transmit signal interference and can make all the difference in Mission Critical Communications.

The TTA system consists of two components: the Tower-Top Amplifier mounted close to the antenna and a Receiver Multicoupler base unit. To reduce the size of the TTA and simultaneously provide 120 dB of isolation of a TX carrier, filtering has been split between the TTA and Receive Multicoupler base unit.

The tower mounted unit is housed in a compact light weight, weather resistant enclosure. The internal electronic components are protected from lightning by surge arresters on all RF ports. The system is designed for quick and simple installation.

Industry leading TTA amplifier linearity guarantees superior immunity to intermodulation interference.


  • Quadrature-coupled low noise amplifier (LNA) improves RX sensitivity.
  • PolyPhaser™ impulse suppressors provide protection from lightning damage.
  • High performance filtering in tower top and base control unit.
  • Wind loading is reduced due to small enclosure size.
  • Quick installation.
  • Compact, light weight, weather-resistant enclosure.
  • One rack-unit high 8-Port Receiver Multicoupler (MCU).


The TTA is designed to increase the performance of a Base Transceiver Station (BTS) while ensuring reliable communications for critical Public Safety applications. This increase in sensitivity can make up for the imbalance between mobile and handheld users in critical systems.

Model NumberDescriptionPower Required
435-83H-01-TTTA, Mini Quadrature Single Amp, 792-824 MHz, Single Network, Tower Box
435-83H-01-M-110Multicoupler Unit (MCU), 8-Port, 792-824 MHzAC
435-83H-01-M-48Multicoupler Unit (MCU), 8-Port, 792-824 MHz-48
435-94D-01-TTTA, Mini Quadrature Single Amp, 896-902 MHz, Single Network, Tower Box
435-94D-01-M-110Multicoupler Unit (MCU), 8-Port, >896-902 MHzAC
435-94D-01-M-48Multicoupler Unit (MCU), 8-Port, >896-902 MHz-48

Tower Top Amplifier will function up to 70°C without shutting down however, the specifications are not guaranteed outside the rated temperature range. MCU specifications values are typical unless noted otherwise.

Graph of TTA Filtering

A steep skirted TEM bandpass filter in the tower box augmented by a ceramic filter in the base unit provide a selective 32 MHz system window.


  • TTA = Tower To Amplifier
  • MCU = Multicoupler Unit

#Note: See the datasheet for Optional Products



Datasheet (PDF)

Product Specifications 
Item No435 Series
Item NameMini Tower Top Amplifier System
Frequency Band700/800 MHz, 900 MHz
Reserve GainConfigurable by Electronic Attenuator
Rejection120 dB nominal at 776 and 851 MHz
Total Power Dissipation17 W
System Noise Figure3.2 db (typ.)
TTA---Frequency Band700/800 MHz: 792-824 MHz
900 MHz: 896-902 MHz
TTA---Type of AmplifierQuadrature Coupled
TTA Gain---Input to output of TTA+23 dB (typ.)
TTA---Noise Figure2.9 dB (typ.)
TTA---LNA OIP3> 42 dBm (typ.)
TTA---Return Loss of all RF Ports> 14 dB
TTA---Power RequirementsPower derived from Rx Cable
TTA----Operating Temperature Range-30° C to 60° C
TTA---Lightning ProtectionImpulse suppressor on all external ports
TTA---Test Port IncludedYes
TTA---Coupling Test Port--Test In-Amp In30 dB
TTA---50 Ohm Termination TestControlled by base unit
TTA---Bypass Test ModeControlled by base unit
TTA---EnclosureWeather resistant housing designed to NEMA Standards
TTA---Dimensions H x W x D8.65” x 5.77” x 6.04”
TTA---Net Weight10 lbs.
MCU---Frequency Bands792-824 MHz, 896-902 MHz
MCU---Net Gain or Loss--RMC In to RX Out+1 dB minimum
MCU---Number of Outputs Ports8 expandable to 16
MCU---TTA ConnectorN-Female
MCU---Receiver ConnectorBNC-Female
MCU---RX-RX Port Isolation>20 dB (min.)
MCU---Test Port InputBNC - Female (Front of RMC)
MCU---Test Port OutputN - Female (Rear of RMC)
MCU---Reserve Gain Electronic Attenuator0-15 dB in 1 dB steps
MCU---Alarm ContactsForm-C Contacts
MCU---Power Requirements90-240 Vac @ 50/60 Hz or -48 VDC
MCU---Operating Temperature0° C to +50° C
MCU---EnclosureStandard EIA 19” Rack Mount
MCU---Dimensions H x W x D1 RU x 19” x 14”
MCU---Net-Weight11.5 lbs