UM100
UHF Belt-pack Transmitter
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The 100 system uses 20 kHz wide deviation for a high signal to noise ratio. The transmitter circuits are all regulated to allow full output power from the beginning (9 Volts) to the end (6.5 Volts) of battery life. The input amplifier uses a Motorola 33078 op amp for ultra low noise operation. It is gain controlled with a wide range input compressor which cleanly limits input signal peaks over 30dB above full modulation.
The UM100 combines over 80 years of engineering experience with the very latest components, in a design that addresses the most demanding professional applications.
The design of the UM100 was the direct result of numerous conversations with users and dealers across the US. The specific concerns and needs brought up in these conversations led directly to the development of the operational features offered on the UM100. Two hundred fifty six frequencies are user selectable in 100kHz steps to alleviate interference problems in travelling venues, and the low frequency roll-off is user adjustable to adapt to varying acoustic environments and preferences.
The UM100 is a rugged, machined aluminum package with a removable, spring loaded belt clip. The input section provides a correct input tap for virtually any microphone or line level audio source. 5 Volts of bias voltage is available to power electret mics with either positive or negative bias. Level indicating LEDs are provided on the control panel to make level settings quick and accurate, without having to view the receiver. The battery compartment accepts any 9 Volt alkaline battery and makes a positive connection via self-adjusting contacts. The antenna is a fixed 1/4 wavelength flexible bronze cable.
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