FMT-25 VHF FM TRANSLATOR 862-09725
Issue 1A:
GENERAL DESCRIPTION
The FMT-25 VHF FM Translatoris a compact unit requiring only 1U Rack space. The
unit is designed for use in VHF FM Stereo Broadcasting in the 87.5MHz to 108MHz,
band. The unit will perform the function of a “Relay receiver” and “25W FM
Exciter”, providing Local (Display) and Remote (Telemetry) functions.
TheFMT-25 offers standard featuresthat include:
•Automatic tuning of Rx Front-end filters.
•Fully synthesized in 50kHz steps (Tx and Rx).
•Rx Diversity operation capability.
•A/C and DC (+24V) operation.
•ALC for RF Power control.
•Telemetry output.
•Rx Headphone output.
•RF Monitor output.
•Comprehensive metering and indicators.
The FMT-25 offers a range of customer options that include:
•ID Module for internal SCA insertion.
The FMT-25 provides a High quality, compact and versatile solution for VHF FM Re-
broadcasting and only requires 1U rack space.
The unit includes a fully synthesized FM Receiver with Front-end tracking filters
and ahighly selectiveCeramic IF Filter. A Tracking demodulator and 100kHz Low
pass filter are also standard features of the receiver section. The unit also includes a
fully synthesizedFM Modulator with provision for internal and external Baseband
inputs. The FMT-25 has a 25-Watt RF Power amplifier module with integral SMPSU.
Low pass RF Filter and couplers are standard on this module.
The FMT-25 is equipped with a +24V dc input, which can be used for Battery/Solar-
powered operation or as back up for mains failure condition. The dc input is internally
fused for protection purposes. The rectified a/c input is also fused internally, while the
a/c mains input is fused on the rear panel.
The schematic diagram of the FMT-25 is shown in figure 2 below.
3. STRUCTURE.
The FMT-25 comprises of the following modules.
a) Display PCB (378-Z0028).
b) Main PCB (378-Z0027).
c) RF PA Module (980801).
