[aprssig] kayaking and APRS
jimlux at earthlink.net
Wed Aug 27 09:24:15 EDT 2008
Richard Amirault wrote:
> ----- Original Message ----- From: "Jim Lux"
>> The idea is that there may not be reliable coverage from a little 5W
>> tracker on the kayak to the overall APRS infrastructure, but that you
>> can probably get back to the car with it, and then, the car can
>> digipeat the packets with a)a bigger antenna and b) more power.
> Hmmmm... I'm no expert .. but I wonder just how far away from the car
> you can be and still reliably hit it? You did say "ocean". Yes, it will
> be "line of sight" but, remember, the power and antenna on the kayak are
> small .. plus .. it doesn't take very far for the curvature of the earth
> to hide the kayak from view of the car.
That's true.. The radio horizon for the antenna on the kayak is pretty
small ( a mile or two) However, one could put the antenna up high on the
car, which would make the radio horizon a bit further away. (maybe 4-5
miles) and, there's some propagation beyond the horizon as well.
It's not like I'm going to be paddling (or, more properly pedalling,
it's a Hobie Mirage drive) to Hawaii, so it should work (and, it's an
experiment, after all...)
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