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 SINTECK 300 Watt
Description
The Smart300-HD is a RF Power Amplifier, suitable for FM broadcast applications. It is
broadband “no tune”, this means the RF power level stays same independently of tuned
frequency in the FM exciter.
A powerful RF low pass filter was included in the Smart Series, it is an important stage in
a RF amplifier. This filter cut off all frequencies above 110MHz. The attenuation of 2nd
harmonic is better than 85dB.
The Smart300 has 300W RF output power with 3-6W RF input. You can connect the
EX05 MiniStation in this amplifier and you’ll get 300W continuous RF power level on the
output. Also, the version Smart300-LD (note: LD means “Low driver” and HD means
“High-driver” inputs) you can connect any 300mW exciter, this version has a RF driver
built-in.
The power output is adjustable from 5W, you can choose what power you need, only
adjusting the trimpot located on the front panel.
A thrue RMS wattmeter was included in this version. Level of Forwarded power and
Reverse power are measured in real-time through the LCD panel of the Smart300-HD.
There is a mechanical cavity measuring all levels of RF power.
The Smart Series has as power supply a “toroidal transformer” and a Step-Down (BUK
REGULATOR) for maximum efficiency. The total efficiency of this power supply is better
than 85%. In addition, this kind of power supply is strongest than other switched mode
systems. Gas discharger and a bank of varistors make the mains protection of the
Smart300-HD.
The equipment is totally protected against fails: when you start the Smart300-HD the
RF power goes increasing softly, after approximately 1 minute the total power is
delivered to the load (antenna). If the equipment find a high level of VSWR the
equipment will work in “FOLDBACK” operation and a message will shown on the LCD,
saying there is a problem with your antenna. High levels of current and voltage are
detected and the Smart300-HD will protect itself, not damaging the final RF stage
(Mosfet transistor, BLF278 in the Smart300-HD).
If the external temperature is more than 55ºC, the equipment will reduce the power
until the normal temperature on heatsink is stablished.
The Smart300-HD is a reliable equipment, never stoping to transmit, although in
extreme conditions. |
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