[AMSAT-BB] Re: Antennas for Satelittes Operations.

11 Apr 2022

      Hi,
Down link can be achieved with Verticals.
Polarization is good if you A) understand it and B) really need it.
X-Quads have narrowed beam width but good gain.
I have also mounted Arrow hand heads on a home made Az/El setup.
Couple real gotchas. 
Get very up to date - 2line Kep files TLEs
And very precise clock/NTP
And make sure you location data with ASL is correct in your software
Ensure you check the ‘birds’ operation status and rules. Like do not use in the dark passes!
Lastly use absolute minimum power from you location.
Oh vertical donut effect will affect stuff. 😊
Sent from my iPhone
G6SGA
...
On 11 Apr 2022, at 08:22, Francis Colau fcolau@gmail.com wrote:

I had a lot of fun with Xquad antennas : https://www.wimo.com/fr/x-quad
73's 
Francis F6DED
...
Le lun. 11 avr. 2022 à 01:16, nathanjwhite nathanjwhite@frontier.com a écrit :
+1 to Greg’s comment.
If you can’t get into the birds with 10 watts (5 is more like it for most of them) you should probably take a good hard look at your rig. 
Running a portable setup will help make this point crystal clear.
A directional antenna is the way to go- for the benefit of ALL users.
Nathan
N5LEX
On Sunday, April 10, 2022, 6:52 PM, Greg D ko6th.greg@gmail.com wrote:
Agreed.  My first contacts were all done with a copper pipe J-pole and a 
whopping 10 watts for the uplink, received by a Radio Shack DX-440 
receiver fed by a long wire strung out to a tree in the back yard.
Unfortunately, the wonderful RS "Easy Sats" are long gone now, but folks 
do pretty well with a pair of HTs and an Arrow antenna.  One gets a real 
sense for antenna patterns and satellite spin when blessing the sky by 
waving a hand-held antenna around.  It's something one can never truly 
get an appreciation for with an automated Az/El antenna system.
Greg  KO6TH
Zach Metzinger wrote:
...
On 4/10/22 11:04, Mark Johns, K0JM wrote:
...
Also, while linear antennas (horizontal or vertical) will provide 
gain, they will also suffer from polarization fading as the 
satellites tumble in space. Circular polarization, or the ability to 
switch quickly between horizontal and vertical polarization, are much 
preferred.
That said, at least one operator has made solid contacts using only 
two "J-pole" type antennas, one each for VHF and UHF, on the XW and RS 
satellites. :-D
Start out small and cheap, get your feet wet, then incrementally 
improve your setup. It'll be a lot of fun no matter what!
--- Zach
N0ZGO

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[AMSAT-BB] Re: Antennas for Satelittes Operations.

Stephen Thornber