Welcome

Welcome to my Amateur Radio Pages. I plan to provide information with some of the things I have experimented with (or I'm currently looking at) with a hope that at least some of it is of interest. A number of the items are not strictly Amateur Radio related but they are likely to be of interest to people interested in Radio.

My particular interests are Software Defined Radios and receiving some of the more interesting things out there (ADS-B, AIS etc). I also have an interest in antennas and antenna design, especially what can be done cheaply, and put up quickly for HF (My home location makes operating difficult).

I also have an interest in High Altitude Ballooning which can include sending location information via a suitable data mode (often RTTY) using license free frequencies in the UK (Unfortunately Amateur Radio is not currently allowed airborne in the UK so it cannot be used for HAB)

UKHASnet

A few of the High Altitude Ballooning community have been working on a distributed sensor network with the aim to get sensor nodes that can communicate with each other. Further details of the project can be found on http://ukhas.net

Raspberry Pi Radio Tracker

This project is to make a Raspberry Pi based tracker (ARPS and/or RTTY) that can be used as a car based ARPS tracker or HAB Payload. I'm hoping to provide RTTY on a GPIO pin with accutate timing. The initial plans are to use a Raspberry Pi, UBlox GPS, Radiometrix NTX2 and Radiometrix HX1

Kernel Headers

Doing any work with the raspberry Pi kernel requires the kernel headers. On most systems this is a simple case of using a kernel-headers style package from the package manager however when using the rpi-update tool to keep the firmware and kernel up to date the packaged kernel headers package doesn't match up with the kernel.

I've found the script on https://gist.github.com/azbesthu/3893319 provides a good method of getting suitable kernel headers for the Pi.

 

Airband - ADS-B

With the use of an SDR radio and the work other interested people have done on creating software there's a wealth of interesting information you can get from the airwaves. I've recently just setup an ADS-B reciever using a Raspberry Pi, R820T based dongle and some free software. The data I recieve is uploaded to Flightradar24 to help them boost coverage.

Hourly Predictor

One tool that is very useful for launching high altitude balloons is a prediction of where it's likely to go. This helps decide whether it's safe to launch and what the chances of recovery are likely to be.

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Simple DIY Dipole

 

It's possible to make an effective dipole using parts that you are likely to already have or that are available at your local DIY store. The construction methods used can be easily adapted to other antenna designs such as beam or halo. These parts are suitable for a 2m dipole centred at 145Mhz

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