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Thread: Iridium Conversations

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    Iridium Conversations

    I'm using my Motorola 9555 here in the CNMI, when calling POTS or cellular I can usualy hear the person fine, but they have trouble hearing me.
    I did a test with someone and 8dB was low and they have difficulty hearing me, but when they raised the gain to 10dB they could hear me much better.
    Is there any way to compensate like this on all my calls?
    Last edited by conscript; 03-06-2021 at 08:16 PM.

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    8 vs 10 dB of RF signal or audio gain? Where is this adjustment made?
    Donald Newcomb

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    audio.
    on his side on his switching equipment.

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    I don't see how you can control the volume on the other end of the conversation but they can. Most phones these days have a volume button.

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    Funny.
    I was hoping for a more technical and less
    facetious answer.

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    The only thing you can do on your end is to increase the height of the antenna. Everything else is controlled by Iridium.

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    it's extended.
    there's rf interferience and the whitenoise can drown out others.

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    "extended" as in "flipped up" or as in "on a pole 4 meters in the air". Iridium's problem is the satellite constellation leaves a lot to be desired at low latitudes. At 30º N & S, you have to have a clear horizon a palm width* all around or the signal is subject to blocking. I haven't done the math but but at 13-18º I'd imagine it would be 3 fingers width. At the poles you could just about be sitting inside a chimney and get a good signal. Iridium works great on a ship or a plane where there's always a clear horizon. It's a mixed bag in terrain.

    *Holding your arm straight out with your hand horizontal, the bottom edge on the horizon and nothing seen above the top edge.

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    as in the stock antenna is pulled out and moved to the angle you can bend it to.
    inside a chimney you say...unfortunatly im just north of the equator on a island with lots of trees, mountains, and buildings made of concrete because of typhoons.
    also overhead electric wires might interfere as well.
    ive tried it while on a twin prop, got a signal but couldnt hear over the engines.

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    Right, around the equator is where the satellites will be lowest on the horizon, due to the polar orbit of the constellation. Now, the satellite could be right overhead for a few minutes but they are constantly changing position. Just before satellite hand-off is when the relative positions are lowest on the horizon. This means that your signal spends a lot of time being attenuated by foliage, hills, etc.

    StarLink compensates for this by having multiple constellations (shells), some in high (near polar) orbit and others in lower orbits. Iridium is based on 1990s technology in which the satellite's coverage is not highly redundant.

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