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VT-3H040 VHF Enhanced Transmitter Instruction Manual
VT-3H040 VHF Amplifier: The amplifier module provides the final stages of RF power
amplification and harmonic filtering for the transmitter. This manual is intended primarily as a
reference since the amplifier module is adjusted at the factory.
OS-3H040 Synthesizer: This manual pertains to the synthesizer module. Channel selection is
described in the 'Transmitter Main Board' Manual.
VT-3H040 Channel Designation Table: This document relates operating frequency to the
transmitter channel number (see section 2.1).
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VT-3H040 Transmitter Family Models
The VT-3H040 line of transmitters has a single RF power output rating of 3.0 Watt, with wide
band FM (20 kHz or 25 kHz channels) and employs synthesizer based frequency generation. The
two basic (i.e. no options added) band specific models of the transmitter are as follows:
VT-3H035-SWA3: 29 MHz to 38 MHz
VT-3H045-SWA3
38 MHz to 50 MHz
The frequency is determined by the model of synthesizer and by the lowpass filter that is installed
in the amplifier module (see the VT-3H040 VHF Amplifier manual for details). A group of
channels spanning 38 MHz can be accomodated by one of the models providing that the
frequency span does not exceed 1.0 MHz. Model VT-3H035-SWA3 can operate at frequencies
up to 38.5 MHz and is the preferred choice when spanning 38 MHz. Consult the factory for
futher information regarding operation around this frequency.
