ATV image generator using the Raspberry PI

20140101_145231I’ve got a Raspberry PI for a while already, but it hasn’t been very useful until today. I recently started setting up my own ATV (Amateur TeleVision) station. I needed a simple solution to generate a test pattern, something to broadcast when testing my ATV transmitter. Since the Raspberry PI has a composite video output, there must be a way to let the PI do the job.

I found several projects on the internet. However, they produce only HDMI output, no composite video. After browsing the web, I found a very easy solution using the Linux fbi command. This command allows you to load a picture in the frame buffer of the graphics adaptor. — more →

First ATV transmission

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My first 23cm ATV transmission (camera output with text overlay), received by PI6ATV.

I’m working on a 23cm ATV transmitter. A couple of years ago I already bought some modules from PE1ACB: a baseband modulator, a 23cm ATV transmitter (output 1 watt) and a controller unit. Today I hooked up all modules, together with a title generator, a camera and a HB9CV antenna for 23cm. When powering on, I was able to transmit/uplink to the local ATV-repeater PI6ATV and see the result at the repeater’s output  at 10 GHz.

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Is our 80/160m HEDZ suitable to work Americans at 160m?

Adrian PA0RDA and his Drake TR-7

Adrian PA0RDA and his Drake TR-7

Last weekend was the yearly ARRL 160m contest. Adrian PA0RDA and I were still a bit in doubt about our HEDZ antenna for 80 and 160m: is it suitable to work American and Canadian stations at 160m? So far we never heard any station from that area on that band, so Adrian decided to bring his Drake TR-7 for the weekend and try to work these countries during the 160m contest, probably the best opportunity for this test. — more →

Spijkerradio

Introduction

“Spijker” is a dutch word for nail, which you would normally use to hang something on the wall, or to construct wooden stuff. However, (brass) nails can also be used as as solder pad. PA0KLS used this idea to construct a receiver, called the “Spijkerradio” (nail radio). It is a nice project for starters to build their own radio.

OLYMPUS DIGITAL CAMERA

The receiver is based on the good old 0V1. This was a very simple receiver with only one tube. PA0KLS redesigned the schema to replace the tube by transistors. He also added a small audio amplifier to allow usage of modern (low impedance) headphones or a small speaker. — more →

All antennas up again

All antennas are in place already for the 2014 PACC contest. Meanwhile they allow me to work HF bands during the Winter season.

Last year the field was in such a bad shape, that we were not able to setup the half extended double zepp for 80 and 160m. This year we had some nice weather in November, allowing us to get all antennas up in a rather short time.

We get used on erecting all those poles, since we do this at least twice a year: at the start of the winter and at the REC fielddays in June. Except the HEDZ, all antennas can be setup by one single person.

My 2013/2014 antenna setup for HF: monoband verticals for 10, 15, 20 and 40m; HEDZ dualband antenna for 80 and 160m.

My 2013/2014 antenna setup for HF: monoband verticals for 10, 15, 20 and 40m; HEDZ dualband antenna for 80 and 160m.