LOL, you sound like a sound tech... maybe a pseudo armchair...

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toad_warrior

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28/12/17

00:00

Post #: 29897396
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Originally posted by Mitchum ↑

Ok, read the annual report, looked at a few videos, read some reports. Looks like a real deal, but one part I do not believe is the satellite to satellite coms distances for a low power satellite using a quad set of low gain antennas with a few watts of available power, with this config I would be expecting signal levels of less that 120 dbm over a distance of 50 kilometers maximum. I see that they use a helix for ground comms but the 4 top antennas look like unity gain type antennas and the limited battery and solar cells on the structure are probable only good for data burst at a few watts or continuos wave class c operation for a small amount of time at around two watts. I wonder if they will publish the technical specification of the satellites? Looks impressive but that is the name of the game.
I am going to follow this with great interest. The top antennas look to be 0.25 w/l around 400 to 500 MHz, I wonder how susceptible the sats are to high power ground based rf transmissions? Downlink helix looks to be 3-5 GHz so maybe no issue over Africa. Off all the people in Australia I probably have had the most experience with satellite onboard equipment such as microwave transponders and antenna design, been involved in sat design for many years. Yes, I actually designed the power ampliers, low noise receivers and directive antenna systems for a number of international satellite projects, Little do people know who lurk on these forums.

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LOL, you sound like a sound tech... maybe a pseudo armchair satellite technician at best

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0 Great analysis

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