Overview
he TM400 system was designed to provide the ideal link between calibrated test microphones and measurement equipment such as SIM, SIA SMAART Live, TEF or other systems. By using a radio link, long cables can be eliminated thus saving time and providing opportunities for additional measurements to increase accuracy. The microphone can even be moved around in the venue while the audience is present—something that is impossible with a cabled measurement microphone.
Lectrosonics Digital Hybrid Wireless uses a proprietary algorithm to encode the digital audio information into an analog format which can be transmitted in a robust manner over an analog FM wireless link. This combination offers the superb audio quality of a pure digital system and the outstanding operating range of the finest FM wireless systems. The digital audio chain eliminates compandor artifacts, and provides audio frequency response flat to 20 kHz. The RF link takes advantage of the spectral efficiency characteristics of an aggressively optimized FM radio system.
This digital/analog hybrid technique has some very beneficial properties. Because the information being transmitted is digitally encoded, useable dynamic range is much higher than a compandor can offer and there is no compandor in the audio signal to interfere with your measurements.
The TM400 system comes standard with the HMa transmitter, R400A receiver, and CCTM400 water-resistant case. However, the components can be ordered separately. Also, the R400A receiver can be ordered with a rack-mount front panel, at an additional cost. System does not include a lav microphone.
Specifications
- HMa Transmitter:
- Frequency Range: 256 frequencies in 100 kHz steps for one 25.5 MHz wide block
- Channel Separation: 100 kHz
- Frequency Selection: Control panel mounted membrane switches
- RF Power Output: 100 mW (nominal)
- Compatibility Modes (6): Digital Hybrid Wireless® (400 Series), 200 Series, 100 Series, Mode 3 (other analog), Mode 6, IFB
- Pilot Tone: 25 to 32 kHz; 5 kHz deviation (400 Series only)
- Frequency Stability: ± 0.002%
- Deviation: ± 75 kHz (max., 400 Series only)
- Spurious Rejection: 60 dB below carrier
- Equivalent Input Noise: –125 dBV (A-weighted)
- Input Level:
- If set for dynamic mic: 0.5 mV to 50 mV before limiting. Greater than 1 V with limiting.
- If set for electret lavalier mic: 1.7 uA to 170 uA before limiting. Greater than 5000 uA (5 mA) with limiting.
- Line level input: 17 mV to 1.7 V before limiting. Greater than 50 V with limiting.
- Input Impedance: 300 Ohms
- Input Limiter: "Soft" limiter, 30 dB range
- Gain Control Range: 44 dB; panel mounted membrane switches
- Modulation Indicators: Dual bi-color LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full modulation
- Controls: Control panel with LCD and four membrane switches
- Low Frequency Roll-Off: Selectable, -3dB at 35, 50 or 70 Hz
- Audio Frequency Response: 35 Hz to 20 kHz, ± 1 dB
- Dimensions: 4.18 x 16.5 x 1.58 in
- Weight: 7.5 oz | 211 g, including lithium batteries
- R400A Receiver:
- Frequency Adjustment Range: 25.5 MHz in 100 kHz steps
- Channel Separation: 100 kHz
- Receiver Type: Triple conversion, superheterodynee, 244 MHz, 10.7 MHz, and 300 kHz
- Frequency Stability: ± 0.001 %
- Front End Bandwidth: 30 MHz @ -3 dB
- Sensitivity
- 20 dB Sinad: 1 uV (-107 dBm), A weighted
- 60 dB Quieting: 1.5 uV (-104 dBm), A weighted
- Squelch Quieting: > 100dB
- AM Rejection: > 60 dB, 2 uV to 1 Volt (undetectable after processing)
- Modulation Acceptance: ± 85 kHz
- Image & Spurious Rejection: 85 dB
- Third Order Intercept: 0 dBm
- Diversity Method: Phased antenna combining - SmartDiversity™
- FM Detector: Digital Pulse Counting Detector operating at 300 kHz
- Antenna Inputs: Dual BNC female, 50 Ohm impedance
- Audio Outputs:
- Rear Panel XLR; -50dBu to +5dBu in 1dB steps
- Rear Panel 1/4 inch; -55 dBu to +0 dBu in 1dB steps
- Scanning Mode: Coarse and fine modes for RF spectrum site scanning
- Audio Test Tone: 1 KHz, -50 to +5 dBu, < 1% THD (XLR output); 1 kHz, -55 dBu to 0 dBu, < 1% THD (1/4" output)
- Transmitter Battery Type Selection: 9V alkaline, 9V lithium, AA alkaline, AA lithium, TIMER
- Smart NR (noise reduction): OFF, NORMAL, FULL modes (Hybrid mode only)
- Power, Ext DC: Minimum 8 volts to maximum 18 VDC; 1.6 W, 200 mA max
- Dimensions (W x H x D): 5.5 x 1.75 x 6.25 in | 14 x 4.5 x 16 cm
- Weight: 13 oz
- Audio Performance (Overall System):
- Frequency Response: 40 Hz to 20 kHz (± 1 dB); -3 dB at 35 Hz
- THD: 0.2% typical
- SNR at Receiver Output (dB): 107 dB (SmartNR set at NORMAL)
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