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TFM-556 - 2 Pages

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TFM-556
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Catalogue excerpts

MODEL TFM-556 Airborne UHF and VHF High/Low band FM Transceiver Technisonic Multi-Band VHF Lo/VHF Hi and UHF AirborneTransceiver The Technisonic TFM-556 Multi-Band airborne VHF/UHF FM transceiver provides for FM communications on every currently available channel within the General Radio Service VHF/FM Low Band (66-88 MHz), VHF/FM High Band and UHF/FM Band. Coverage is 66 to 88 MHz, 138 to 174 MHz and 403 to 512 MHz all in 2.5 KHz steps. Operating frequencies and other related data are presented on a 96 character, four line LED matrix display The TFM-556 can be installed to operate in “Single Mode” functioning as a multi-band transceiver operating in VHF Lo, VHF Hi or UHF bands in which case combined audio is run through a single audio controller FM input. In this mode, any of the three bands are accessed one at a time. Alternately, the TFM-556 can be installed in Dual Mode” allowing for simultaneous communications on UHF and either VHF Low or VHF High Band. In dual mode, the VHF Low and VHF High band are combined and only one of these bands can transmit at any given time. All data entry and control commands are entered via an enhanced 12 button keypad situated on the face panel. The TFM-556 can be operated in the Direct Entry or Simplex mode by simply keying in the desired operating frequency. It can also function without restriction on any split frequency pair within any of it’s three bands. This unit features 600 preset memory positions (200 channels per band) each capable of storing a receive frequency, a transmit frequency, a separate CTCSS tone for each receive and transmit frequency, an alpha numeric identifier for each channel and a DPL or DCS coded squelch identifier for each channel. This transceiver provides for either 25 kHz wide band or 12.5 kHz narrow band operation on any or all of it’s 600 preset channels. An upload/download function allows the operator to download channel information from a PC, or upload stored data from the transceiver to a PC. Supporting software is supplied with each unit. Information stored in the transceiver’s memory is available for instant recall by keypad entry or, by pressing the M.UP or M.DOWN button which allows the operator to scroll through all preset channels. The TFM-556 transceiver also features a DTMF encoder for signaling during transmit, cross band repeat capability and a scan function. Additionally, a remote control head (RC-556) is offered which provides for slaved operation of the main transceiver from a remote location, allowing for a second position in the aircraft to exercise frequency control. The TFM-556 transceiver is panel mounted (Dzus) and completely self contained in a 8.0 x 3.75 x 5.75 inch chassis weighing just 5.2 pounds. Front panel controls are UHF for UHF audio level; VHF for VHF High Band audio level and VHFLO for VHF Low Band audio level. The VHF/UHF/VLO band switch enables selection of the desired band as well as providing for manual programming, a VHF/PRI select switch provides for a VHF priority channel, and a HI/LO switch controls transmitter power output. Twenty eight (28) volt DC backlighting is standard, (5 Volt AC is optional) and controlled by the aircraft dimmer bus. Display brightness is controlled from the front panel keypad. The small size and light weight of the TFM-556 MultiBand transceiver makes this radio ideally suited to helicopter installations. Technisonic FM radios are compliant with RTCA DO-160C categories relating to Vibration, Overpressure, Humidity, Temperature and Altitude, Magnetic Effect, Power Input, Voltage Spike, Decompression, and RF Emission (including DO160C, Section 21, Category Z). FCC and IC approval not available on the VHF Low (66-88 M

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General Active frequency coverage Tuning increments Operating mode Memory positions Dimensions Weight Temperature range Altitude Power requirement Certification RTCA DO-160C Env. Categories CTCSS squelch capability DPL/DCS capability DTMF encoder Audio output Audio distortion Speaker output Back lighting Display Transmitters Transmit RF power output Maximum deviation Spurious attenuation Frequency stability Microphone circuit Sidetone output Harmonic attenuation FM hum and noise Audio input Audio distortion Transmitter output impedance 2.5 KHz, all three bands F3E Simplex or Semi-Duplex 600 Channels...

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