[aprssig] Path loss question
dave at emv.co.uk
Mon Sep 11 07:10:46 CDT 2006
But as the frequency goes up, the wavelength goes down, so you can have
more gain in the antenna department, omni (co-linear) or beam, for the
same sort of size, negating much of the effects of increasing frequency.
So, in practice, for the same physical sizes and powers, there is not a
great deal of difference between 144 and 432 for a direct line of sight
path, especialy at a distance (well into the "far field" region)
What realy kill's things, is cable losses as the frequency goes up,
unless you push the boat out big time in the cost of cables, or other
types of feeder...
> -----Original Message-----
> From: Bob Bruninga [mailto:bruninga at usna.edu]
> Sent: Saturday, September 09, 2006 1:44 PM
> To: vk4tec at tech-software.net; TAPR APRS Mailing List
> Subject: Re: [aprssig] Path loss question
> Path loss increases with the SQUARE of frequency.
> Thus from 2m to 70cm is about -9 dB
> de Wb4APR, Bob
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