Flexiva™ High Power

Air-Cooled FM Transmitter for Analog and Digital Standards High Power - 5 kW to 80 kW

The Flexiva air-cooled FM solid-state transmitter family provides today’s broadcaster with a single transmission platform capable of analog and digital operation. Incorporating field-proven GatesAir technology, Flexiva transmitters deliver world-class performance, reliability and quality.

Flexiva is designed for low- and high-power requirements, up to 80 kW, while utilizing the most compact design on the market today. Flexiva continues the legacy of the highly successful line of GatesAir FM transmitters and combines innovative, new quad-mode RF amplification and software-defined exciter technology to take FM transmission to the next level.

Featuring PowerSmart® technology, the Flexiva line offers unmatched efficiency that makes it ideal for all FM applications. The 50-volt LDMOS device technology delivers a dramatic increase in power density, lower operating costs and reduced cost of ownership over the life of the transmitter.

As the digital transmission leader, GatesAir has developed a solid core competency backed by years of experience in the complex technical areas that are essential for maximum transmitter performance. Customers can also count on GatesAir for implementation, and the company offers a range of support options from standard 24/7 telephone technical assistance and parts to installations, training, full system design and field maintenance contracts.


Flexiva High Power Class Transmitter Features

  • Identical power blocks for scalability. 5,000 Watts to 80,000 Watts
  • Small and compact. 5 kW or 10 kW power blocks in only 16 rack units
  • Common dual 1800 Watt Power Amplifier and IPA modules for all power levels simplifies spares
  • Single-phase or 3-phase power, Delta or Wye configurations. 190 to 464 VAC
  • 1:1 Power supply to Power Amplifier module maximizes redundancy
  • Hot-Pluggable, hot-swappable power amplifier and power supply modules minimizes down-time and simplifies maintenance
  • Simple, distributed hardware based control architecture uses analog circuits to control critical transmitter functions. Not reliant on a microprocessor for high reliability
  • Hardware based life-support backup controller provides added robustness, reliability
  • Can use any standard FM exciter or can be tightly integrated with FAX low power exciter

Flexiva Family Common Features

  • Full power range from 1 to 80,000 Watts in two classes of the same family
  • Fully broadband, 87.5 to 108 MHz — requires no tuning or adjustments
  • Best-in-class power efficiency — lowest operating costs
  • Extremely high power density; compact and lightweight space-saving design
  • Latest state-of-the-art LDMOS-FET power amplifier technology
  • High efficiency (96%) auto-ranging, hot pluggable power supplies
  • Continuously variable speed fans optimize cooling, maximizes efficiency and minimizes fan noise
  • Redundant internal cooling fans draw air from front to rear with ducted air options available
  • Digital Ready: Quad-mode operation: FM, FM + HD Radio™, HD Radio only or DRM+
  • Maintain power up to 1.5:1 VSWR. Proportional VSWR foldback for safe operation at reduced power into marginal loads (icy antenna etc.)
  • Automatic restart after AC mains interruption; returns to previous operational mode
  • Global control and monitoring via the World-Wide Web remote graphic user interface (GUI) works with any PC, tablet or smart-phone
  • Full SNMP network control and monitoring support
  • In-depth diagnostics and setup via an easy-to-use front-panel control
  • Dual-Drive with automatic failover exciter switching
  • N+1, Dual Transmitter and Main/Alternate and with automatic switching capability
Images / Diagrams

Flexiva Configuration 
Each Flexiva transmitter combines an FM exciter and one or more amplifier bays — each with various configurations of PA modules to achieve the rated power.

The amplifier bays contain several major systems: 

Power Amplifier Module 
This hot-pluggable, hot-swappable module features a pair of 50v LDMOS-FET based broadband (88-108 MHz) RF PAs that require no user adjustments. The PA modules are identical and fully interchangeable in each Flexiva transmitter. Each amplifier can be re-biased on-the-fly for operation in FM, FM + HD Radio and HD Radio only, or DRM+ mode.

Intermediate Power Amplifier Module (IPA) 
Identical and swappable with the PA modules for models 10Kw and higher, the IPA module provides RF drive through the PA splitter to the input of the PAs. The IPA uses only one-half of the module leaving the other half as a standby IPA with automatic failover switching in the event of on-air IPA failure. This feature provides additional redundancy protection.

Power Supply Module 
This hot-pluggable module is a 2400 W 48 V PS with a .98 power factor and mains input range of 90-264 V. The PS interface provides on/off functionality to the power supplies, a fan tachometer alarm and redundant feed to the cooling system. Each module also has +5 V output to redundantly drive the low-voltage control circuits and 1:1 power supply to power amplifier redundancy. Each 48 V power supply’s output is also summed and fed to the dual IPA, fans and control system for maximum redundancy.

Cooling System 
The air cooling system includes internal redundant fans that pull cool air from the front through a removable filter, allowing exhaust to exit through the rear of the transmitter. Systems integrated in Harris Broadcast cabinets feature top exhaust to support ducting and, optionally, can have ducted air input plenum to permit top, bottom or rear air input.

Control System 
Featuring extensive protection and control capabilities, the main system control is located in the Flexiva amplifier bay and communicates directly with the Flexiva for fully integrated control and monitoring. Each PA module has dedicated control and monitoring to support on/off functionality and alarms for reflected power, temperature and current overloads. The control systems also provide for remote access via a parallel, SNMP and Web-enabled GUI.


Specifications and designs are subject to change without notice.

Transmitter Type Solid State VHF Power Amplifier for FM, HD Radio and DRM+
Exciter Requires external FM Exciter
Frequency Range 87.5 to 108.0 Mhz, 10 kHz steps
Operating Modes “Quad-Mode” on-the-fly switching between FM HD only, FM+HD or DRM+
Frequency Stability ±150 Hz
Power Stability ≤ ±0.25 dB
Asynchronous AM SNR >60 dB
Synchronous AM SNR >50 dB
RF Harmonic and Spurious  
Suppression Meets or exceeds FCC, IC, CE, CCIR IRTU and IEC215 requirements
VSWR Protected against open or short circuit, all phase angles
Compliance RoHs, FCC, CE, IC, R&TTE 1999/5/EC compliant
Output Power- Max Watts FAX5K FAX10K FAX20K FAX30K FAX40K
Nominal Power 5,000 10,000 20,000 30,000 40,000
FM Analog Power Range 500-5,500 1,000-11,000 2,000-22,000 3,000-33,000 4,000-44,000
FM+HD -20 dBc 4,500 9,000 18,000 27,000 36,000
FM+HD -14 dBc 3,500 7,000 14,000 21,000 28,000
FM+HD -10 dBc 2,650 5,300 10,700 15,900 21,200
HD Only -20 dBc 2,000 4,000 8,000 12,000 16,000
HD Only -14 dBc 1,850 3,700 7,400 11,000 14,800
HD Only -10 dBc 1,550 3,700 6,200 9,300 12,400
50 ohms RF Output Connector Un-Flanged
* Optional Adapter
1-5/8" EIA 1-5/8" EIA 3-1/8" EIA 3-1/8" EIA 4-1/16" EIA
3-1/8” EIA*
Electrical FAX5K FAX10K FAX20K FAX30K FAX40K
AC Input Voltage, VAC 47-63Hz Single Phase & 3-Phase (3-Wire) Delta: 3-Phase (4-Wire)Wye):
Power Consupmtion MAX Watts 8,127 16,254 32,507 49,500 66,000
AC-RF Analog FM Efficiency at Nominal Power Typical: 72%
Power Factor 0.99%
Mechanical FAX5K FAX10K FAX20K FAX30K FAX40K
Number of Power Amplifiers 7 14 28 42 56
Number of Power Supplies 4 7 14 21 28
Number of Fans 3 4 8 12 16
Air Flow max CFM m3/min:

500 850




Width 19 in. (48 cm) 19 in. (48 cm) 22 in. (59 cm) 47 in. (120 cm) 47 in. (120 cm)
Depth 29 in. (74 cm) 29 in. (74 cm) 37.5 in. (95.3 cm) 37.5 in. (95.3 cm) 37.5 in. (95.3 cm)
Height 16RU 28 in. (71 cm) 16RU 28 in. (71 cm) 44RU 83 in. (211 cm) 44RU 83 in. (211 cm) 44RU 83 in. (211 cm)
Weight (approx w/ modules installed) 145 lbs 66 kg 276 lbs 125 kg 1,002 lbs 455 kg 1,700 lbs 771 kg 1,850 lbs 839 kg
Altitude 15,000 ft 3,000 (4,572 m) AMSL
Ambient Temperature Range 0 to +45° C inlet air temperature must not exceed 45° centigrade at sea level. Derate at 2° C per 1000 ft (300 m) AMSL
Humidity 95%, non-condensing
Audio Performance with Flexiva Exciter
FM Modulation Capability ±150 kHz deviation, 200% modulation
Stereo Amplitude Response ±0.05 dB
Wideband Amplitude Response ≤ +/- 0.04 dB, 20 Hz to 53 kHz
Stereo Separation ≥70 dB
Crosstalk ≥70 dB
Total Harmonic Distortion ≤0.05%
Intermodulation Distortion ≤0.05%
Stereo FM SNR ≥83 dB 75 µs de-emphasis “A” weighting
Composite/Mono FM SNR ≥90 dB
Pre-emphasis 0, 25, 50, or 75 microseconds
Program Inputs with Flexiva Exciter
Audio Inputs 2 AES3 audio or Composite/MPX over AES192. XLR 110 ohms balanced, -2.8 dBfs nominal;
0 dBfs to -15 dBfs, Up to 196 kb/s, 16, 24, 32 bits
1 Analog L/R, XLR, 10K/600 ohms balanced, Nominal +10 dBu +15 dBu maximum
MPX/Composite 2 BNC balanced 10 K/50 ohms
-6 to +18 dBu (1 to 17.5 Vpp)
4 AES192 (selectable between AES3 audio and MPX/AES)
External SCA / RDS 2 BNC, unbalanced 10K ohms, 1.5 V nominal 4 V maximum
Internal RDS Generator Internal Static RDS/RBDS generator
Supports fields: TP, PI, PS, PTY, RT and 8 AF channels
Reference I/O with Flexiva Exciter
External 10 MHz Clock Input BNC female, unbalanced, 50 ohms, -10 dBm to +10 dBm
External 1 PPS Clock Input BNC female, unbalanced, 50 ohms, TTL level
GPS Antenna Input w/  
Internal GPS Option Optional GPS with supplied antenna +5v 30ma. +5v 30ma
10 MHz Clock Output w/  
Internal GPS Option BNC female, unbalanced, 50 ohms, 0dBm
1 PPS Clock Output w/  
Internal GPS Option BNC female, unbalanced, 50 ohms, TTL level
19 kHz Pilot Sync Output BNC female, unbalanced, 50 ohms resistive, sinewave, phase adjustable, AC coupled, 4.5 V pk-pk nominal, unterminated
Remote Control I/O  
Ethernet Ports 2 RJ-45 100 Mb Ethernet/IP ports
1 front panel with DHCP server and fixed IP address for maintenance access
1 rear panel with static or dynamic IP address for LAN/WAN access to Web GUI and SNMP
Parallel GPI/O DB25 female standard remote control GPI/O
Active-low, 5v 100ma
Exciter Interface 2 DB15 female direct interface control for dual exciters

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