BW-TX25 - 25 Watt Stereo FM Transmitter

BW-TX25 - 25 Watt Stereo FM Transmitter

The TX25 is a top specification FM broadcast transmitter that is ideally suited for low power radio stations. The output power is adjustable from 3-25 watts.

The Frequency is adjustable from 87.5 to 108 MHz from internal direct reading switches or from the front panel graphics display control system. Setting the frequency internally disables the menu system from changing the frequency ensuring no unauthorised frequency changes.

The FM25 graphics display on the front panel can indicate frequency, forward and reverse power, power amplifier temperature, power amplifier voltage, PLL board voltage, modulation levels as well as the amount of gain reduction of the internal audio limiter module.

The Rear panel contains XLR balanced inputs with input level controls, BNC for multiplex output from the internal digital stereo generator, BNC for multiplex input to the exciter for loop through operation and external processor input.

There is also A 15 way D-Type connector, pins being available on the D-Type for fault monitoring, external control of RF output and RS232 control and monitoring.

The RS232 control and monitor system is a dual mode system and the transmitter can be controlled and monitored from a standard terminal program or our custom windows application.
The windows application can be downloaded here.

The RF output is via an N-Type socket. Main input is via a fused swicthable IEC power connector.

The transmitter is fully configurable and the limiter and stereo encoder can be switched in and out of circuit. Jumpers available on board for pre emphasis, clipping, processing mode (clarity/loud), stereo/mono, and limiter on/off.

The 'Virtual VFO' dual loop PLL system allows perfect audio flatness to below 10 Hz. AFC bounce and modulator overshoot are a thing of the past. You now can pass that low bass without distortion and overshoots and obtain that extra low frequency stereo separation.

The power amplifier is based modern MOSFET device. A fresh air tunnel through the transmitter keeps cool air running right through the heatsink. The amplifier is protected from damage by temperature control systems and antenna fault (SWR) monitoring.

The power to the amplifier is turned back into the safety zone should a fault occur, keeping you on air rather than shutting down completely and taking you off air. Internal harmonic filtering keeps your RF signal clean and compliant to FCC/DTR standards.

The transmitter contains two fully approved efficient switched mode power supply modules with a a universal input voltage range from 85-260 Volts AC, Ensuring compatability of any mains system WORLD-WIDE.

The TX25 is an attractive all-in-one broadcast solution for small scale stations. Because the exciter, amplifier, power supply, stereo encoder and limiter are all in one case the price is less than half that of other comparable systems. Designed for the small scale broadcaster and at a small scale price.

Specifications
RF Section
Power Output3-25 Watts Adjustable
Output Frequency87.5 - 108 MHZ (MegaHertz)
Frequency Steps100kHz from LCD or 12.5kHz steps from internal switches
Frequency SelectionInternal Switches or Front Panel LCD System
Frequency ControlDual Speed Phase Locked Loop (PLL)
Frequency Stability+/- 200 Hz (fine adjustment available)
Output ConnectorN-Type (50 Ohms)
Harmonic FilteringBetter than -70dBC
Spurious EmissionsBetter than -85dBC
SWR ProtectionFoldback above 2.1
MPX InputBNC
MPX Input Response+/- 0.3 dB 5 Hz to 100 kHz
MPX Input Level-10dB to +10dB (adjustable)
ModulationDirect Frequency Modulation
Stereo Encoder
Subcarrier GenerationMicroprocessor Generated (oversampled)
Pilot Frequency19khz +/- 1 Hz (adjustable)
Pilot GenerationMicroprocessor Generated (oversampled)
Output Level(BNC) 0db
15kHz FilteringMore than 40db at 19kHz
15kHz Overshoot Filter ClippingSelectable ON or OFF
Spurious > 80 kHzMore than 50dBr
Spurious > 160 kHzMore than 80dBr
Stereo Separation>50dB (20hz-15khz)
Limiter
Input Levels-10dB - +18dB for Limiting
Input ConnectorsXLR balanced (RF shielded)
Input CMRRMore than 60db
Audio DistortionLess than 0.1% at Limiting 1 kHz (clarity mode)
Frequency Response20 Hz to 20khz +/- 0.5db (0 uS Pre-Emphasis)
Control RangeMore than 22db (0 uS Pre-Emphasis)
Input Impedance10k
Pre-emphasis50us & 75us (Selectable)
Processing ModesClarity and Loud
ClippingON or OFF
Dimensions & Other
Control System3 Buttons, 128x32 Graphics Display
External Control/Monitor15 Way D-Type
Physical Size475mm x 44mm x 250mm
Weight2.5kg
Voltage Input85-260 VAC (50-60Hz)
Power ConnectorIEC, FUSED and Switchable
Switched Mode PSU ApprovalsUL/TUV/CE



BW-TX25 - 25 Watt Stereo FM Transmitter Reviews:

  • --> This company have proven themselves in the broadcasting industry as far as i am concerned. My TX-25 has been up and running for over a year now and there has been no problems at all.

    The spurious and harmonic signals are very well controlled and I think its one of the cleaner transmitters i've ever worked with and i have worked with quite a few.