Protection:
Excessive Heat sink temperature:
Three short beeps LED 4 OFF
Excessive Input Power:
Three long beeps LED 4 Flashing
Excessive SWR or LP Filter Error:
Three long beeps LED 4 Flashing
Input drive and power output:
The amplifier should give almost full output with approximately 10W input. This should be the
nominal input power. You may find that less power is required on the lower bands and slightly
more is required on 10m to obtain full output.
Maximum output power considerations:
All amplifiers have a maximum output and this occurs shortly after gain compression where by Pin
no longer produces a proportional increase in power output . The amplifier should always be oper-
ated at a point below its saturated output. Trying to extract every last watt by overdriving the ampli-
fier will not actually help your signal to be stronger, you will in fact cause higher levels of distor-
tion which will make your signal less intelligible at the distant receiver station.
Running the amplifier a little under max output will also allow the amplifier to run cooler and make
it more reliable for many years of use.
As an example consider the following situation.
1 ‘S’ point on a receiver is usually approximately calibrated at 6dB so for example the difference
between S5 and S7 2 ‘S’ points is 12dB.
The difference between 15W and 280W is nearly 13dB a healthy increase to your signal strength,
more than 2 ‘S’ points, difficult to achieve by with an antenna alone for most ham operators espe-
cially if space is limited. Now lets say for example you run the amplifier at a moderate 250W out-
put by slightly reducing the input power, the difference between 280W and 250W is only 0.5dB
which when you compare this to 6 dB per S point is actually very little and as the amplifier is run-
ning not at its absolute maximum will give a cleaner output with less distortion that will actually
make a difference at the distant receiver for the better!!
Warranty:
This product is covered by a 24 month warranty commencing from the date of purchase.
The original purchase receipt will be required for any claim. This warranty does not cover
aesthetic damage or damage to the RF power transistors from incorrect use.
www.rmitaly.com e-mail: Info@RMItaly.com
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