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« on: August 25, 2019, 07:24:23 PM »
Imperial fire
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I never gave this a second thought b4 but have now that i am studying remote sensing.
Why are long range systems being called ULTA HIGH FREQUENCY systems..
They are running on say 900Mhz..
But 900Mhz is lower than say 2.4 Ghz that a cheap fly sky radio runs on...
Shouldn't it be called low frequency?
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« Reply #1 on: August 25, 2019, 07:26:33 PM »
Imperial fire
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Or is it being called UHF in relation to the long antenna 70MHZ transmitters that we used in the old days?
Coz yes then i can understand why 900 is higher than 70..

But then a second question comes...
If lower is better why dont we still use 70MHZ Radios?

Am i mixing different concepts..?
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« Reply #2 on: August 26, 2019, 08:47:36 PM »
pnkyjs
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I hear that 70Mhz is prone to intereference. 2.7 Ghz is over that . The 70Mhz tech used crystals ..... wonder if that was an issue handicapping its development.
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« Reply #3 on: August 26, 2019, 08:57:46 PM »
Imperial fire
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I would absolutely love to know what is what..
Its amazing how these things work..
I just joined my course a couple of weeks ago..and wonder why i never thought about a lot of things before..
Btw pankaj...they taught us a little about false colour imagining that you spoke about...
Very interesting i must admit.
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« Reply #4 on: August 26, 2019, 09:03:34 PM »
pnkyjs
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Yes , it was interesting, and it was a part of my course in Geology when i was in College. Nice , you remembered me on that .
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