24 Mar
2011
24 Mar
'11
7:42 p.m.
I agree with Dee, but I'll add my opinion. The fixed elevation option is a good approach to reduce your costs.
If you are going to fix the elevation, do *not* use a very high gain antenna with a narrow beam width. You are better off with a moderate gain antenna (for example, the Elk or 4-7 element vertical or 2x7 circularly polarized) so that you have a wider beam width.
73, Steve N9IP
--
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> -----Original Message-----
> From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-
> bounces@amsat.org] On Behalf Of Dee
> Sent: Thursday, March 24, 2011 2:18 PM
> To: 'Ted'; GW1FKY@aol.com; amsat-bb@amsat.org
> Subject: [amsat-bb] Re: Antenna discussions
>
> The actual fixed elevation on the AZ rotor is determined by the beam width
> of the yagi antenna used. If at all possible, all the calculations based on
> the average pass elevation is near 30 degrees. If you believe that you will
> use lower passes, say if the beam width is 25 degrees, putting it fixed at
> about 20degrees gives you the split of + - 12.5 degrees. It IS a tradeoff.
> The higher the gain of the Yagi, the lower the beam width.
> Good Luck...
> Dee, NB2F
>
> -----Original Message-----
> From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-
> bounces@amsat.org] On
> Behalf Of Ted
> Sent: Thursday, March 24, 2011 2:02 PM
> To: GW1FKY@aol.com; amsat-bb@amsat.org
> Subject: [amsat-bb] Re: Antenna discussions
>
> Agree !!
>
> Along those lines, before I put up my Kenpro az/el rotor, I plan on testing
> various locations using my Elk with a fixed el but on a small rat shack
> rotor for az. I have seen here recommendations for 15 deg and some for 30
> deg fixed el. Thus there seems to be 2 schools of thought on this. Is there
> any compelling argument for one or the other? I'm almost inclined to split
> the diff at +-22 deg. (most passes for me are N/S and to the E - not so good
> to W
>
> Any thoughts appreciated
>
> 73, Ted, K7TRK
>
> -----Original Message-----
> From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-
> bounces@amsat.org] On
> Behalf Of GW1FKY@aol.com
> Sent: Saturday, March 19, 2011 2:36 AM
> To: amsat-bb@amsat.org
> Subject: [amsat-bb] Re: Antenna discussions
>
> Hi all,
> Regarding the discussions on antennas - I am not into any debate about the
> pro's and con's, but would just like to encourage anyone to just have a go.
> Sure the argument will always prevail perhaps under the " Must do Better"
> comment and I am sure
> that one can always improve or progress with experimenting - ( AMATEUR
> RADIO )
>
>
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