# Re: FO-20 and Horizon Obstruction

• Subject: Re: [amsat-bb] FO-20 and Horizon Obstruction
• From: "Jeff Griffin" <jeff.griffin@xxxxxxxxxxx>
• Date: Sat, 15 Nov 2003 10:14:43 -0500

```Also disregard FO-20 as it hasn't been operational in months. Or did you
mean FO-29, which is operational...

73 Jeff kb2m

----- Original Message -----
To: <mike@hatzakis.net>; <amsat-bb@AMSAT.Org>
Sent: Saturday, November 15, 2003 5:27 AM
Subject: Re: [amsat-bb] FO-20 and Horizon Obstruction

> At 11:41 PM 11/14/2003 -0800, mike@hatzakis.net wrote:
> >
> >I am fairly new to this satellite hobby and I am now just trying to hit
> >FO-20.  I heard nothing and realized that in the azimuth heading of 60-90
> >degrees or NE to East, I have a mild mountain behind me.  It starts at a
> >elevation of zero to a max of 30 degrees or so here in the NW at this
time.
> >
> >At a distance of about 1/4 mile from here, there is a grade that peaks at
an
> >elevation change of about 1000 feet or so compared to my QTH.  I am at
550
> >and the top is about 1500.  Is it simple geometry to figure out the
minimum
> >elevation to which I can hear a satellite?  Ideas?
> >
> >Michael, K3MH
>
> Michael,
>
> Disregarding earth curvature, its simple trig:  1/4-mile = 5280/4 = 1320
> feet which forms the horizontal leg of a triangle
> the vertical leg is 1500- 550 = 950 feet
> the angle is the arc-tan (950/1320) = arc-tan (.72) = 39.7 degrees
elevation
>
> or in simple terms a "big hill"!
>
> 73, Ed - AL7EB
>
>
>
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
----
Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org

```

AMSAT Home