|2 MS/s @ 2.4 GHz 80 watts|
|Spectrian bare bones amplifier|
|Thermal image of Spectrian|
Now that Es'hail 2 is launched I thought it might be time to see how much
power I will be able to generate when it comes time to use the asset.
It didn't go as well as I had planned. I can generate about 80 watts of DVB-S2
at 2.405 GHz that looks reasonable but it requires almost 800 watts of input power.
The amplifier is the working parts of a Spectrian unit minus the original heatsinks
(because of shipping costs from the U.S). It is not obvious from the thermal image
as to why the efficiency is so low. The MRF286 devices have a claimed efficiency
of 28 - 32% at 2 GHz obviously they will have less efficiency at 2.4 GHz and there
will be losses in the PCB and the combiners but 10% is pretty low.
So it looks like I will have to try a different approach to saving us all from
global warming. Currently I am looking at the MRF7S24250 device which has
250 watt output at 2.4 GHz a gain of 14.5 dB and an efficiency of about 55%.