Lectrosonics Inc HMA9 Manuale Utente

14

Specifications and Features

 is a revolutionary design 

that combines digital audio with an analog FM radio 

link to provide outstanding audio quality and the 

exemplary RF performance of the finest analog 

wireless systems.
The design overcomes channel noise in a dramati-

cally different way, digitally encoding the audio in 

the transmitter and decoding it in the receiver, yet 

still sending the encoded information via an analog 

FM wireless link. This proprietary algorithm is not a 

digital implementation of an analog compandor. In-

stead, it is a technique which can be accomplished 

only in the digital domain.
The process eliminates compandor artifacts, 

expanding the applications to include test and mea-

surement of acoustic spaces.

*US Patent 7,225,135

Specifications

941.525 - 951.975 MHz 

 

 

952.875 - 956.225 MHz 

 

 

956.475 - 959.825 MHz 

Frequency Selection Steps: 

Selectable; 100 kHz or 25 kHz

RF Power output: 

Selectable 50/100 mW

Pilot tone: 

27 to 32 kHz; 3.0 kHz deviation 

 

 

(in the Digital Hybrid mode)

Frequency stability: 

± 0.002%

Spurious radiation: 

Compliant with ETSI EN 300 422-1 v1.4.2

Equivalent input noise: 

–125 dBV (A-weighted)

Input level: 

Nominal 2 mV to 300 mV, before limiting.  

 

 

Greater than 1V maximum, with limiting. 

Input impedance: 

300 Ohms

Input limiter: 

Dual envelope “soft” limiter; greater than 30 

 

 

dB range

Gain control range: 

55 dB; panel mounted membrane switches

Modulation indicators: 

Dual bi-color LEDs indicate modulation of 

 

 

-20, -10, 0, +10 dB referenced to full 

  

modulation

Frequency Response: 

35 Hz to 20 kHz (+/-1dB)

Low frequency Roll-off: 

Adjustable for -3dB 

 

 

@30, 50, 70, 100, 120 or 150 Hz)

 THD: 

0.2% (typ.) 100 Hz to 20 kHz

SmartNR 

no limiting 

w/limiting

OFF  103.5 108.0
NORMAL 107.0 

111.5

FULL 108.5 113.0

Note: The dual envelope “soft” limiter 

provides exceptionally good handling of 

transients using variable attack and release 

time constants.  

Once activated, the limiter compresses 30+ 

dB of transmitter input range into 4.5 dB of receiver output range, thus reducing the measured 

figure for SNR without limiting by 4.5 dB.

Controls & Indicators: 

• 

Power/Phantom “ON-OFF” 

 

 

• 

Phantom voltage selector 

 

 

• 

Audio input gain 

 

 

• 

LCD w/membrane switches 

 

 

• 

LED audio level indicators  

Audio Input Jack: 

Standard 3-pin XLR (female)

Phantom Power: 

5V @ 18 mA max., 15V @ 15 mA max. 

 

 

and 48 V @ 4 mA max., plus “OFF”

USB port: 

Used for firmware updates

IR (infrared) port: 

For quick setup by transferring settings from 

 

 

an IR enabled receiver

Antenna: 

Housing and attached microphone/cable 

 

 

form the antenna

Battery: 

Two 1.5 Volt AA alkaline

Battery Life (Duracell Quantum): 
  AA alkaline; No Phantom Power: 

5h 0m* 

  AA alkaline; 48V Phantom Power:  3h 30m**
  *Tested with a dynamic microphone 

  **Tested with a Sanken CS1 for a phantom-powered microphone  
Weight: 

6.7 oz (190 grams) without batteries

Dimensions: 

4.25x1.62x1.38 inches

Emission Designator:   

180KF3E