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Hi Steve, I think that adding an amplifier would be overkill for this. You would be draining your batteries much quicker and adding another potential point of failure. The 10mw output has been proven in other similar designs to be sufficient. I would also suggest using 1 band of operation in the balloon, adding many filters and a switching system to the output of the SI module would add excess weight to your balloon. For a first launch go as inexpensive and as simple as possible, learn from the mistakes and make something better the second time. For my first launch I considered sending up a simple beacon without gps telemetry as a proof of concept test of the code.? When things progress, maybe a 2-way relay, basically a low power, low altitude? hf satellite would be an interesting advancement of the project.? Keep us updated Stephen On Sat, Mar 23, 2019, 12:57 AM Steve S via Groups.Io <stu61957=[email protected]> wrote: I have made some changes to the code I found in this group's file download section to do some testing. I am deciding whether I would need to increase the RF output of the SI5351 to ensure its reports are heard during a balloon mission. I am still waiting for parts to build the amplifier to get 200-500 milli-watts output to the antenna. |
