[FADCA] Would this work for HIGH speed?

[bud thompson]

----- Original Message ----- 
From: "Rick Muething" <rmuething at cfl.rr.com>
To: "Chuck Hast" <wchast at gmail.com>; "Florida Amateur Digital Communication 
Association" <fadca at mailman.qth.net>
Sent: Friday, February 25, 2005 10:18
Subject: RE: [FADCA] Would this work for HIGH speed?


> Chuck,All
>
> Yes the site did look interesting including the data radios shown there.
> They may offer some good alternatives.
>
> I also have had an opportunity to do some initial testing with the new 
> Icom
> ID-1 (D-Star) data radios. The initial results look encouraging but we are
> really just starting testing over longer hauls.

<SNIP>

> There are some nice commercial quality beams available (up to 18 dBd) for 
> <
> $200 from M squared. I wonder if someone could do a realistic path 
> analysis
> and see if these could handle backbone links with reasonable antenna 
> heights
> and 16 db antennas?
>
> 73,
>
> Rick KN6KB
>

Rick-

The prop prgm I have recently been using is limited at 960 MHz, so ran the 
following:

F 960 MHz
TX pwr 10w
Antenna height 150 ft
VSWR 1.2:1
Antenna gain 18dB
Rx sensitivity 2uv
Feed line loss 0.5dB
Path distance 40 miles
Terrain - Flat, no veggies.

Results
Radio Horizon 34.6 miles
Line Loss 128.2 dB
Fade Margin 6.5 dB
Estimated useable range 49.4 miles

Donno if this is realistic - my general experience for paths over 30 miles 
is below 30 MHz!

bud