Power amplifiers
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The choice of power amplifiers for DATV is very critical and due to a characteristic called spectral re-growth it is vital that amplifiers are not overdriven.
The average FM or SSB amplifier MUST backed off by at least 50% or 6 - 10dB by reducing the drive from the transmitter. This means a 50 watt amplifier will only deliver 20 watts of clean DATV power.
On 146 MHz we are aiming to achieve shoulders which are 60 dB down on the main signal!
- The RA60H1317M Mitsubshi 60 watt brick can only deliver a clean 7 watts out and draws 5 amps at 12v to achieve this!