Overview
The HMa from Lectrosonics is a UHF plug-on transmitter that accepts mic or line-level signals via a standard XLR connector. It has selectable 5, 15, & 48V phantom power and can be used when paired with a Lectrosonics receiver and handheld microphone - sold separately - in applications for ENG (Electronic News Gathering), EFP (Electronic Field Productions), interviews for broadcast TV, and more.
The input amplifier of the HMa transmitter uses an ultra-low noise op-amp for quiet operation and is gain controlled with a wide range dual envelope limiter. A 24-bit A to D converter digitizes the audio, and filters the supersonic noise above 21 kHz. The resulting signal is encoded with a proprietary algorithm to produce an analog data signal for RF transmission.
Featuring a wide tuning range of 76 MHz, with tuning steps in increments of 100 kHz or 25 kHz for up to 3072 frequencies, the HMa transmitter also covers three standard 25.6 MHz Lectrosonics frequency blocks. Each block provides 256 different pilot tone frequencies. Legacy analog wireless microphone and IFB receivers are designed to work in DSP compatibility mode, as well as some receivers from other manufacturers.
The transmitter is powered by two AA batteries, with status indicated by a multi-color LED. A USB port is also provided for firmware updates, and an IR (infrared) port is included to simplify setup with IR enabled receivers.
Specifications
- Frequency Selection Steps: Selectable; 100 kHz or 25 kHzRF
- Power Output: Selectable at 50 or 100 mW
- Pilot Tone: 25 to 32kHz frequency 5kHz deviation (in the Digital Hybrid mode)
- Frequency Stability: +/-0.002%
- Deviation: +/-75kHz (max in Digital Hybrid mode)
- Spurious Radiation: 60dB below carrier
- 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: 300Ohms
- Input Limiter: Dual envelope "soft" limiter; greater than 30dB range
- Gain Control Range: 55dB; panel mounted membrane switches
- Modulation Indicators: Dual bicolor LEDs indicate modulation of -20, -10, 0 and +10 dB referenced to full modulation
- Frequency Response: 35Hz to 20kHz (+/-1dB)
- Low Frequency Roll-off: Adjustable for -3dB at 30, 50, 70Hz)
- 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 at 18 mA max., 15V at 15 mA max. and 48 V at 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 form the antenna
- Dimensions: (L x Dia.)4.25 x 1.62 x 1.38" / 107.95 x 41.15 x 35.05mm
- Weight: 7.5oz / 212.62g (with AA batteries)
Documents
