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PostHeaderIcon European Microwave Week 2018


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PostHeaderIcon EME 2018 Conference

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PostHeaderIcon A Remote Controlled WiFi Antenna Switch

Introduction

This article describes the design and construction of a remote WiFi Antenna Switch for HF that is an order of magnitude more economical than any wireless remote switch available today. It is limited in its power handling and frequency bandwidth, but I believe it is of great use for most of ham radio operators.

 

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PostHeaderIcon Low-Cost 2,4 GHz Duplex Telemetry

by Reinhardt Weber, DC5ZM

The idee of this project was the wish puting my sat-rotor YAESU G-5600 in the attic avoidung two heavy control cables. This requires a radio controlled duplex telemetry connection for sending the key status and get back the analog values of meters for azimuth and elevation.

The project schown is an universal implementation with 4 digital und 4 analog channels for general apllications and is not restricted to rotors.

 

Click here to read all in PDF

Click here to construction of PCB's

 

PostHeaderIcon RadioRivista report

The first ham radio presentation in this conference trip, I had with CN2017 in Ladek Zdroj, Poland, in the premises of a tourist resort “Zamek na Skale” (means “the Castle on the Rock”). While traveling to that event, I used a train from Krakow (Krakau) to Wroclaw (Breslau). The ride took around 3.5 hrs, so I spent that time by experimenting with Polish APRS network. Although my equipment included SCS Tracker / DSP TNC, I could not use it on the train because it could not get its power supply from the USB ports of my laptop. Instead I used 'Plan B': It was a USB interface RIGblaster Plug'n'Play for making the laptop's sound-card a packet modem, and Taiwanese GPS-mouse YIC GU93030SM-USB (Fig. 1). Having in mind travel conditions such as the 'Faraday cage' of the train construction, high voltage power lines over the railway composition, a relatively high speed of the train – circa 120 km/h, and geographical configuration of surrounding terrains and so on, it was not expected that signals sent by a small hand-held radio ADI AF-16 will reach many recipients, if any (Fig. 2 & 3).

Click here to read all in PDF

 
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