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Doubts on the choice of antenna

IW0HJR – May 18, 2008 – 12:20

Hello everyone.
Like many people, I do not know the possibility of using motorized antennas in elevation.
Able to use only antennas with vertical polarization must now update my system antennas.
At the time of MIR I used with satisfaction antenna type DISCONE, but the fact of working with a large band penalizes lot yield and introduces unwanted disturbances.
I replaced the DISCONA with a V2000 I found that the signals for high angles of reception have deteriorated.
With its faults the DISCONE was better for this type of use.
Now I do not have any antenna, as well as for HF, and I think about how to implement the part for the V / UHF.
My first interest was for a vertical antenna type X-50, because of its lobes irradiation declared.
Then I took into account an X-510 and the second descriptions should have a lobe of irradiation much crushed on the horizon.
I believe that this will penalize traffic via satellite.
It appears that the X-50 is most appropriate although band 70CM does not seem very satisfying, being a 5 / 8 lambda.

In your experience would you deal with a better X-50 or an X-510?
If I take into consideration the construction of a double Turnstile banda or a BIG WHEEL (even if only horizontal polarization) would be better?

Last thing is that I use 60 meters of coaxial cable.
I already have a preamplifier duoband ready to be installed.
I would be happy to work well the ISS and receive enough LEO satellites.

I ask your opinions.

A greeting and thanks.

IW0HJR
Op. Romano

Misc
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Possible antennas

N5VHO – May 18, 2008 – 12:43

Sounds like you want an antenna system to work for numerous satellites. The ISS is fairly easy to work with a dual band vertical due to its higher output power but that won't do you much good for most of the other satellites. Since using an AZ-EL tracking system is not feasible, maybe you could use a pair of eggbeaters. With one on 2 meters and the other on 430 (with a pre amp) you will have excellent coverage on high passes in addition to coverage at lower elevations.

Kenneth - N5VHO
http://spaceflight.nasa.gov/station/reference/radio/
Support ARISS http://www.amsat-na.com/donation.php (select "Human Spaceflight (ARISS))

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Kenneth Thanks very much for

IW0HJR – May 18, 2008 – 13:05

Kenneth Thanks very much for your reply.
You have understood my situation very well!
I treasure your advice that, unfortunately, follow those that I thought myself.
At this point drop the idea of permanently collinear antennas.

Already have a antenna eggbeaters for 70CM that have yet to mount.
Now I should build or buy one also for 2 Meter.
I sincerely believe that in Italy antennas are little known because we do not speak for almost anything in radio.
It 'a pity.

Take preamplifiers (single 2 M and 70cm) and two EGBBEATER antenna.
I believe you.
Thanks really for your advice.
You have been very kind.

IW0HJR
Op. Romano

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