Author: SM0TGU

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Juan Antonio, EA4CYQ, har publicerat ett antal artiklar om amatörradio i PDF-format.

Hi all,

I have published several articles in relation to ham satellites in AMSAT and other magazines such as URE, CQ-DL, Megahertz Magazine and several Webs. But most of them were in Spanish.  I have translated them into English, you can find the following issues:

– The CJU antenna. It was designed by EB4DKA and EA4CYQ to improve the UHF reception with your HT, it is thought to uplink with your VHF mobile station.  You will receive the UHF downlink in the same way a fix satellite station.

– The IOio antenna. It was designed by EA4CYQ to work V/U and U/V amateur satellites with an HT.  It has an amazing performance, it is even better than the Arrow antenna in some features.

– A dual band portable yagui antenna. This is a very well known antenna into the amateur satellites world.  Here you can find how to build it with normal stuff and an impressive performance.

– The EGGBEATER II and TPM II antennas.  They were designed by Jerry K5OE. In this article I tell my experience at the beginning in the amateur satellites world and all the vicissitudes to work amateur satellites from my shack with the minimal equipment.  Here you will find all the details to build these fantastic antennas.

– The 2.4GHz DISH ANTENNA.  Taking advantage of my AO-40 experience I could go more deeply into the microwaves world.  Here you can find all the details to build two different 2.4GHz dish feed systems, which you will be able to use in wireless terrestrial communications.

– The LINEAR TRANSPONDERS.  A lot of amateur satellites use this system.
This article will help you to understand how they work.

– HF or SATELLITES?.  I try to demonstrate with this article that a satellite fix station is at least as good as an HF station.  You will get the same performance with small antennas and low power out.

– The DATA CONNECTOR.  This connector has much more possibilities than to be hooked to a TNC.  In this article I study its features and I propose to use it with a PC soundcard, to receive meteorological satellites and I even propose to build a cross band repeater.  You will be surprised about its possibilities.

– CIRCULAR POLARIZATION.  If you want to know more about this kind of polarization and you want to see a comparative of VHF and UHF circular polarized commercial antennas, you should read this article.

– TRANSCEIVERS TO WORK SATELLITES.  If you are thinking about setting up a fix satellite station, here you can find all the transceivers in the market and combinations between them to be successful.

– THE EA4CYQ SHACK.  Here I describe my shack, perhaps it could be useful as a reference if you are thinking about setting up one.

– THE EA4CYQ LOG.  If you have contacted with my station between June
1.996 and March 2.008, here you can find it.  It is in call sign alphabetical order.  We will upload it in the near future.

You can find them at the following Webs due to the generosity of Pedro EB4DKA and Rodolfo EA4CAX:

http://eb4dka.laserenadigital.com (also www.eb4dka.tk ).  This Web is devoted to ham satellites and Pedro has an impressive collection of photos, videos and interesting articles.  He is an authority working in portable conditions.

http://personales.ya.com/ea4cax/ Rodolfo is specialized in LEO and Geostationary meteorological satellites.

O hope you enjoy this articles devoted to promote the amateur satellites.

Juan Antonio
EA4CYQ@amsat.org