That sounds very interesting Ralph. RF communication with a car seems to
work fine up to
about 140-180 MPH when the S/N ratio appears to drop towards 1. I have
no idea what the
xmit power input was in these cases. I suspect it was low (1-10 W).
Bryan
Ralph Forsythe wrote:
>Neil, I had a moment of inspiration on this and think I have a
>possible solution... Ham Radio. It's very easy to transmit slow-scan
>video and packet data (i.e., da-da-da, telemetry) bidirectionally using
>hardware that's not only cheap, but widely available on the used market
>even cheaper.
>
>A license takes all of about a week of studying and $8 to pass a test (I'm
>KC0CSO by the way, any others here?), and seems ideal for this
>application. Ham's only limitation is that it cannot be used for
>commercial radio communication - this is most definitely NOT commercial,
>LSR is about as much of a mainstream, hobby/amateur sport as they come.
>You will have no trouble finding a willing Ham operator (including myself)
>to assist you in setting it all up since that hobby is a lot like this one
>- everyone shares info just because they like to see something really cool
>in the end.
>
>I'm envisioning two dual-band radios, a lot of which nowadays can transmit
>on one frequency and receive on the other. Even on low power you'll be
>fine on 2m/70cm bands, but those radios will typically put out up to 50w,
>which means they'll be reading you 5/5's in SLC if you want. Anyway, have
>one radio set to transmit on 2m and receive on 70cm, the other radio
>exactly the opposite. You now have full duplex voice channels at all
>times, over which you can also send data with about $50 in stuff you plug
>into your laptop. Cheap, easy, reliable, and something I've been thinking
>about a lot over the past few days.
>
>I'd be happy to help anyone with something like this, including getting
>your tech-class license, which is required before you can transmit on an
>amateur radio frequency. I even have all the equipment I need at home to
>try something like this out, which I'm planning on doing in the next 2-3
>weeks, just for pure geek factor. I'd be happy to send details to the
>list or anyone else who wants to know how I set it up.
>
>- Ralph
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