AEV Mirage FM Audio processor + limiter, 3-band

Description

TOTAL CONTROL OF MODULATION

In FM transmission, the signal fed to the transmitter must not, under any circumstances, exceed a deviation of 75 KHz. High level peaks, normally of short duration, do not carry sound energy and produce over-modulation. To limit these peaks, single band limiters act over the entire audio spectrum and generally attenuate the sound. Mirage FM divides the signal into 3 frequency bands and controls them separately, acting only on the band in which the peaks are present. This is performed without compromising sound density and maintaining a full and constant modulation.

EXCITING SOUND

The adjustable functions of Mirage FM allow the audio signal to be processed and immediately adapted to the requirements of the broadcaster. In this manner Mirage FM can produce deep, powerful bass, brilliant mid-range and clean, sharp treble. The speaker’s voice will be exalted and the intelligibility of phone-ins will be greatly improved.
The sound of your radio station will become warm and embracing or aggressive and exciting, precisely as you want it to sound – with full modulation, constantly monitored and distortion-free.

DIGITAL STEREO ENCODER

The digital stereo encoder fitted to the Mirage FM MPX as standard, demonstrates just how advanced an audio processing system can be. Beyond guaranteeing superb stereo separation between channels, it ensures maximum levels of modulation and total control of spurious peaks generated by the low-pass filter and pre-emphasis networks present in external coders.

Technical Specs

Frequency response: 30 Hz ÷ 15 KHz ± 0,3 dB (By-pass)

AGC Control: ± 10 dB

Stop Band Rejection: > 90 dB above 75 KHz

Noise: Output noise depends by processing parameters; AGC, threshold, gain and density Greater than 84 dB Din Audio (By-pass).

Total distortion @ 1 KHz: Than less 0,05%

Crosstalk L/R R/L: Greater than 60 dB Din Audio (90 dB at 3 KHz).

AUDIO INPUT:

Configuration: Left and Right

Impedance: 10 KΩ electronically balanced

Input level: – 20 ÷ +10 dBm

Common-mode rejection: Greater than 50 dB, (30 ÷ 15.000 Hz)

Connector: XLR Female

AUDIO OUTPUT:

Configuration: Left and Right, Flat, Pre-emphasized or De-emphasized (50 o75mS).

Impedance: 100 Ω electronically balanced

Connector: XLR Male

STEREO ENCODER (*):

Configuration: 1 Output with level control

Pilot frequency: 19 KHz ± 0,001 % max over temp.

Pilot injection: 4 ÷ 12 % adjustable

Distortion at 1 KHz: Less 0,005 %

Signal-to-Noise ratio: Greater than 92 dB DIN AUDIO

Stereo separation: Greater than 60 dB 30 ÷ 15 KHz (70 dB at 1 KHz)

Crosstalk Main to Sub: Greater than 45 dB 30 ÷ 15 KHz (75 dB at 1 KHz)

Crosstalk Sub to Main: Greater than 40 dB 30 ÷ 15 KHz (75 dB at 1 KHz)

38 KHz subcarrier suppression: Greater than 80 dB

76 KHz and sideband suppression: Greater than 90 dB

Composite output level: 0 ÷ + 12 dBm

Impedance: 50 Ω

Connector: BNC floating

Max cable length: 10 mt. RG58 A/U

Pilot reference output: 1 Vpp sq. wave

Impedance: 600 Ω

Connector: BNC floating over chassis

SCA input: -14 ÷ + 6 dBm for 10% modulation of main carrier

Input impedance: 10 K Ω

Connector: BNC floating over chassis

RDS level: -24 ÷ 0 dBm for ± 2 KHz of main carrier

Input impedance: 10 K Ω

Connector: BNC floating over chassis

GENERAL DATA:

Power supply: 87 ÷ 265 VAC 50-60 Hz

Power consumption: 8 VA

Dimensions: (19″x 9.4″x 1.7″) 48,3 x 24,0 x 4,4 cm 1 rack unit

Weight: 8.4 Lbs (3,8 Kg)

Operating temperature: 0 ÷ 50 °C