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The ET Broadcast design team has done it again. This time creating a Low Power SW transmitter line that continues ET Broadcasts legacy and reputation for reliability and quality.

These rugged and reliable transmitters are designed for low maintenance and high quality audio.

Offered at 300W, 600W and 1.2kW these compact solid state transmitters are ready to help your station sound great. They feature optimized high level modulation, 90% PA efficiency with 80% overall efficiency (AC in to RF out).

These compact, rock solid, performers offer the perfect solution for the replacement of the older style Solid State and tube SW transmitters

The ET Broadcast SW300 is one of the most ruggedly constructed solid-state Shortwave / HF AM broadcast transmitters available today. The SW300 is designed for survivability in the most severe environments. The ET Broadcast range of transmitters offer you long term reliability, unsurpassed audio performance and state of the air features.


Additional information

Weight 15 kg
Product can be split into multiple boxes


Ship Separately



RF Section

Power Output
300 Watts AVG, 1.2kW PEP

Frequency Range
2-30 MHz, (any 1Mhz band) tunable in 1KHz steps

Output Impedance
50Ohm unbalanced, type N

RF Harmonics
-73 dB or more below rated output

Frequency Stability
+/- 5ppm

Spurious Outputs
-73 dB or more below rated output

Noise and Hum
-60 dB or more at 100% modulation

Audio Section

Modulation Capability
130% positive peak

Audio Frequency Response
+/- 0.5dB, 30-10, 000KHz

Audio Input
600 Ohm, 10dBm +/-1dB to produce 100% modulation

Audio Distortion
Better than 1%THD at 95% modulation


2 x 80mm depression fan

280mm x 88mm x 450mm


Voltage input
85-260 VAC

Power connector

Humidity Range

4, 000m (0-13, 000 ft)

Switched mode supplies Approvals


A strong signal with 130% positive peak modulation
Lower power costs with 80% power to RF efficiency
VSWR, over-current and over-temp protection
Solid-state PWM design achieves best audio quality, superior frequency response and low levels of distortion
Broadband RF design so no tuning required
DRM compatible – Can broadcast digital stereo with any suitable DRM exciter

• +90% RF PA efficiency
• Optimized multiphase modulator (flat group delay, low source impedance)
• Capable of +125% positive modulation
• Compact design
• Designed to easily accept the new digital IBOC signal
• High efficiency switching power supplies


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BROADCAST Transmitters ET Broadcast SW300