Lectrosonics UM200 - Manual (Page 5)

NO PRE-EMPHASIS/DE-EMPHASIS
The signal to noise ratio of the 200 system is high enough to preclude the need for conventional pre-emphasis (HF
boost) in the transmitter and de-emphasis (HF roll off) in the receiver. Pre-emphasis and de-emphasis in an FM
radio system usually provides about a 10dB improvement in the signal to noise ratio of the system, but the high
frequency boost in the transmitter must be removed in a purely complementary manner or else the frequency
response of the original audio signal will be altered.
Pre-emphasis can also cause distortion in the receiver. As this signal is passed through the IF filters in the
receiver, distortion can be produced, most noticeable at full modulation. De-emphasis cannot be applied until the
signal is converted into audio, so there is no way around this problem short of eliminating pre-emphasis altogether.
Neither of these problems occur in the 200 system. The dual-band compandor in the 200 Series system essentially
provides a dynamic pre-emphasis/de-emphasis function with extremely low distortion.
PILOT TONE SQUELCH
The 200 system utilizes an ultrasonic tone modulation of the carrier to operate the receiver squelch. This "pilot
tone" consists of a 32kHz signal mixed with the audio signal following the microphone preamp, just after the
compandor, to control the audio output muting of the receiver. The pilot tone is filtered out of the audio signal
immediately after the detector in the receiver so that it does not influence the compandor or various gain stages.
The basic benefit of the pilot tone squelch system is that the receiver will remain muted until it receives the pilot
tone from the matching transmitter, even if a strong RF signal is present on the carrier frequency of the system.
This is extremely important in applications such as with an automatic microphone mixer.
WIDE-BAND DEVIATION
75kHz deviation improves the capture ratio, signal to noise ratio and AM rejection of a wireless system dramatically,
compared to the more commonly used 15kHz deviation.
LONG BATTERY LIFE
High efficiency circuits throughout the design allow over 4.5 hours of operation using a single 9 Volt alkaline battery.
The battery compartment is a unique mechanical design which automatically adjusts to fit any brand of alkaline
battery. The battery contacts are spring loaded to prevent "rattle" as the unit is handled.
FREQUENCY AGILITY
The transmitter section uses a synthesized, frequency selectable main oscillator The frequency is extremely stable
over a wide temperature range and over time.
Two rotary switches, located on the side panel of the unit, provide 256 frequencies in 100kHz steps over a
25.5MHz range. This alleviates carrier interference problems in mobile or travelling applications.
ANTENNA
At UHF frequencies, where wavelengths and antennas are shorter than VHF, a resonant length wire is preferred
over using the microphone cable as the antenna. The antenna on the UM200 consists of a flexible 1/4 wavelength
wire, detachable via a twist lock connector. The impedance of this connector is 50 Ohms at UHF frequencies.
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