Lectrosonics UM200c User Manual download pdf (Page 5)

Frequency Agile UHF Belt-Pack Transmitter

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 that include 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.

(A 9V lithium battery will provide over 14 hours of operation.) The battery compartment is a unique mechanical

design which automatically adjusts to fit any brand of 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 at VHF frequencies, a resonant length wire is

preferred over using the microphone cable as the antenna. The antenna on the UM200C consists of a flexible 1/4

wavelength bronze cable, detachable via an SMA connector. The impedance of this connector is 50 Ohms.

Rio Rancho, NM – USA

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Lectrosonics UM200c User Manual Page 5