20W Professional FM Broadcast Transmitter



20W Professional FM Broadcast Transmitter. Overview

Suitability

This is a popular choice in Nigeria for campus type university radios that are licensed by the state for 20 watts. Using this 20 watt transmitter with our 4 way stacked dipole is a popular choice producing a total EIRP of approximately 80 watts.


Which Version Do You Need?

The stereo version with audio processing and limiting is available or the straight raw composite MPX version. If you're not sure which version you need, then it's a high probability that need the stereo version with audio processing and limiting. In any case the stereo version has the option of MPX input, it can be used for both. If you wish to connect the unit to external processing such as Optimod, Inovonics, Breakaway, StereoTool etc you should use the MPX version More Information HERE.

20W Professional FM Broadcast Transmitter. Front View

RDS - Radio Data System

As an optional extra this transmitter is available with dynamic and programable RDS fitted. If you want RDS option please ADD TO CART above


Five Years! Warranty
5 YEARS LIMITED WARRANTY
MORE INFORMATION


20W Professional FM Broadcast Transmitter. Rear View

Reliability

Like all our products, we over engineer them, this is no exception. This uses a 45 watt transistor, for 20 watts output. basically you can throw any amount of reflected power at this unit and it will laugh in the face of it. Basically this transmitter, is not super, not ultra, it's HYPER reliable

Construction

The enclosure is made in strong 16 gauge steel, powder coated and baked in satin black. This leaves a tough, durable surface that will never rot or corrode and be cleaned to shine for decades. The front panel is 19 inch across and 2U (3.5 inch) high with a depth of 12 inches, so it will fit with ease into a standard rack. It is very strong and difficult to damage even under extreme handling.

20W Professional FM Broadcast Transmitter. MPX version

Settings

If you are qualified or understand broadcast radio specifications and parameters you can set the frequency and deviation yourself. This is easily done by flipping over the unit and adjusting the little dip switches on the underside panel. More information on this in the User Manual, you can find a link to this below.

Antennas

On delivery the equipment is ready to plug in and use with any suitable 50 ohm antenna system such as our:
SINGLE DIPOLE
4.8dBi 2 DIPOLES
7.8dBi 4 DIPOLES
10.8dBi 8 DIPOLES
4.8dBi 5/8 ANTENNA
-0.8dBi CIRC. DIPOLE


Our system package the 20W EIRP system includes this transmitter with a dipole antenna and very low loss LMR400 cable to give you a full system that will comply with the regulations of the European Union and most other countries in the world.

Do You Have A Question?


Compliance

The stereo version with audio processing and limiting meets all the regulatory standards required out of the box and pre configured. In fact if you send us a copy of your permit and it's conditions, we will set it up exactly to the specification. This equipment complies with EU/CE harmonised standards and FCC technical requirements for FM broadcasting. More information HERE

User Manual

RF Specification

All stated measurements were made at 220VAC at 27 Deg. Celsius ambient temperature unless stated.

Power Output Adj. 1-20 Watts into 50 ohms
Spurious Emissions Less than -75 dB ref to carrier
Harmonic Emissions Less than -70 dB ref to carrier
Freq Stability +/- 1 KHz max. typ. +/-300 Hz
Deviation Sensitivity Stability +/-2 % max
Freq Fine Adj > +/- 1000 Hz
Freq Range 87.5 to 108 MHz in 100 KHz steps
Out of Lock RF Muting Less than -70 dB ref to carrier
Residual AM Less than 0.5 %
Synchronous AM Less than 0.5 %
RF Ruggedness Any VSWR phase or length of time
Output Connector N-Female
Operating Temp -20 to +40 Deg C

AF Specification

Pre-emphasis (50 uS/ 75 uS/ None) Selectable
Audio Input Connector Phono/ RCA type unbalanced sockets
Audio Input Sensitivity +4 dBu for +/- 75 KHz dev.

Version MPX Stereo and Audio Processor
Signal To Noise Ratio 80dB 65dB
Frequency Response 30Hz-76KHz 30Hz-15KHz
Audio Distortion 0.2% THD Max 0.2% THD Max (at MPX section)

AC Specification

Input Voltage 90-264 V AC 135-370 V DC 47-63 Hz
Input Power 40W for 20W RF OUT with RF SWR less than 1.5
Working Humidity 20-90% RH non-condensing
Safety Standards UL60950-1 TUV EN60950-1 BSMI CNS14336 CCC GB4943 J60950-1 approved
EMC Emission Compliance to EN55022 class B EN61000-3-2 3 FCC PART 15 / CISPR22 class B CNS13438 class B GB17625.1
EMC Immunity Compliance to EN61000-4-2 3 4 5 6 8 11 light industry level criteria A
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