AirMedia Products

AXON 50W

50 watt FM Transmitter — Solid State Compact for Broadcast Radio

AXON 50W is a high-fidelity audio stereo or MPX FM transmitter. Its natural, warm sound highlights the quality of the signal. Options include OIRT and Japan bands, web TCP/IP telemetry, and dynamic RDS.

The AXON series is a family of FM stereo exciters and transmitters built for superior transmission quality. Output power runs from 30 W to 1200 W using the latest high-efficiency LDMOS technology, in an ultra-compact 2U cabinet. JPN and OIRT frequencies are also available.

AXON can work as an ultra-compact stand-alone station or as a driver in high-power transmitters and N+1 systems.

Main Features

High-efficiency latest-generation LDMOS technology, up to 80%
Very low signal to noise, more than 90 dB
Very low distortion and high stereo separation
Total spectral purity: > -100 dBc spurious, > -84 dBc harmonics
Seven selectable complete setups, ready for 7+1 systems
Full-range power supply: 90–260 VAC
Compliant with ETSI, CCIR and FCC
Digital stereo coder
LDMOS amplifiers up to 75% efficiency
External 10 MHz and 1PPS synchronization for SFN applications
Remote control by TCP/IP: web and SNMP for all signal parameters
Dynamic RDS encoder with TMC

Technical Characteristics — 30 W to 1200 W

Frequency range: 87.5–108.00 MHz, programmable in 10 kHz steps. On request 66–74 MHz (OIRT) and 76–90 MHz (JPN)
Frequency stability: Better than ±150 Hz from -10 to +50°C
Max deviation: ±150 kHz
Frequency control: Synthesizer, microprocessor control
Power output: 30 W, 50 W, 100 W, 150 W, 300 W, 600 W, 1200 W. Adjustable from 0 W to maximum power
Output impedance: 50 ohm
Display: Forward and reflected power, and modulation indicator
Type of modulation: Direct frequency modulation of the carrier, F3E stereo with subcarrier and mono
Lock-in time: Typ. 4 seconds
Off-lock attenuation: ≥ -80 dBc
Modulation capability: ±150 kHz
Modulation mode: Mono, stereo, multiplex, SCA, RDS, aux
Pre-emphasis: Flat (0) / 50 / 75 µs, selectable from the front panel
Asynchronous AM S/N: -60 dB below reference carrier with 100% AM modulation at 400 Hz, without FM modulation
Synchronous AM S/N: -60 dB below reference carrier with 100% AM modulation at 400 Hz and FM modulation ±75 kHz at 400 Hz
RF harmonics: Exceeds ETSI/EBU/CCIR/FCC requirements. Better than 84 dBc
RF spurious: Exceeds ETSI/EBU/CCIR/FCC requirements. Better than 84 dBc
Output connectors: 30 W to 600 W: N-type. 1200 W: DIN 7/16
Output power control: On/off and adjustable from the front panel and remotely
Overall efficiency: Up to 80%
Monitor RF: -60 dBc, BNC connector
VSWR: 1.5:1 maximum, with automatic fold-back at higher VSWR

Monaural Operation

Audio input impedance: 600 ohm balanced, 15 kohm unbalanced
Audio input level: -6 to +12 dBm. Other ranges on request
Input connector: XLR female
Audio frequency response: ±0.15 dB, 30 Hz to 15 kHz
THD + noise: 0.03% at 400 Hz
Intermodulation distortion: 0.03%, 1 kHz / 1.3 kHz, 1:1 ratio
Transient intermodulation: 0.03%, 2.96 kHz square wave and 14 kHz sine wave
FM S/N ratio: -89 dB RMS detector, -85 dB below ±75 kHz deviation, 50 µs de-emphasis, weighted

Multiplex Operation

Composite input impedance: 5 kohm unbalanced
Composite input level: 3.5 Vp-p for ±75 kHz deviation
Input connector: BNC female
Composite amplitude response: ≤ ±0.1 dB, from 30 Hz to 53 kHz
THD + noise: 0.03% at 400 Hz
Intermodulation distortion: 0.03%, 1 kHz / 1.3 kHz, 1:1 ratio
Transient intermodulation: 0.03%, 2.96 kHz square wave and 14 kHz sine wave
FM S/N ratio: -89 dB RMS detector, -85 dB below ±75 kHz deviation, 50 µs de-emphasis, weighted

Stereo Operation

Audio input impedance: 600 ohm balanced, 15 kohm unbalanced
Audio input level: -12 to +12 dBm
Input connector: XLR female
Audio frequency response: ±0.15 dB from 30 Hz to 15 kHz
THD + noise: 0.03% at 400 Hz
Intermodulation distortion: 0.02%, 60 Hz / 7 kHz, 4:1 ratio, +4 dBu
Transient intermodulation: 0.03%, 2.96 kHz square wave and 14 kHz sine wave
FM S/N ratio: -85 dB RMS detector, -82 dB below ±75 kHz deviation, 50 µs de-emphasis, weighted
Stereo separation: 30–80 Hz ≥ -53 dB, 80 Hz–15 kHz ≥ -65 dB (typ. 70 dB)
Crosstalk attenuation: Main to sub -55 dB, 30 Hz to 15 kHz
38 kHz suppression: ≥ -70 dB (typ. -85 dB)
Pilot frequency: 19 kHz ± 1 Hz
Pilot phase: ±2°, adjustable
Output pilot: 1 Vpp, BNC female
Audio filter attenuation: ≥ -55 dB at 19 kHz, > -45 dB from 20 kHz to 100 kHz
Modes: Stereo, mono L+R, mono L, mono R

AES/EBU Operation

Input level: -10 dBFS to 0 dBFS
Input connector: XLR female, optical TOS-LINK
Input impedance: 110 ohm
Data format: S/PDIF, AES/EBU, IEC958, EIAJ CP340/1201
D/A converter: 24 bit
Sampling frequency: 32 to 96 kHz, with automatic selection
Stereo separation: ≥ 50 dB, 100 Hz to 5 kHz
Amplitude response: ≤ ±0.1 dB, from 30 Hz to 15 kHz
FM S/N ratio: -85 dB below ±75 kHz deviation, 50 µs de-emphasis, weighted