Tag Archives: DX

DX Alarm Clock Part 2 – Hardware

I recently wrote a blog article about the DX Alarm Clock software – here is Part 2 of the Series on the how I built the hardware for the DX Alarm Clock.

DX Alarm Clock Hardware Components

The DX Alarm Clock is based on a Raspberry Pi 3 computer and an Adafruit Pi-TFT Touch Screen Display.  The list of components, along with links is below.  Since I built the Raspberry Pi almost a year ago and technology is always advancing, some of the parts are no longer available or have better replacements available.  I’ll provide information on what I used and a recommended replacement.  Approximate prices are included.

Raspberry Pi 3
Raspberry Pi 3

Motherboard: Raspberry Pi 3 ($35) – includes a 1.2 GHz 64-bit quad-core ARM CPU, Build in WiFi, Ethernet, 4 USB Ports, an HDMI port and audio port (3.5″) and Bluetooth.

Also, you will need a power adapter  ($10) and Class 10 Micro SD card ($15) for the Raspberry Pi.  Ours is a SanDisk Ultra 64GB Micro SD Card.

Pi-TFT Touch Screen Display
Pi-TFT Touch Screen Display

Display: Adafruit Pi-TFT 2.8″ Display with Capacitive Touch Screen ($45).  A slightly larger, 3.5″ display is now available.

PiBow Case
PiBow Case

Case: Pimoroni PiBow Case for Raspberry Pi and Pi-TFT Display($20)

Kinivo Speaker
Kinivo Speaker

Portable Speaker:  Any small portable/rechargeable speaker will do.  Mine is a Kinivo, but it is no longer available.  Any small speaker will do as long as it is Bluetooth or has a 3.5″ stereo connector.

Completed DX Alarm Clock Hardware
Completed DX Alarm Clock Hardware

The picture above shows the completed DX Alarm Clock Hardware running portable using a USB battery pack.

Raspberry Pi Development Environment

Raspberry Pi Development Environment
Raspberry Pi Development Environment

After constructing the Raspberry Pi, case and TFT Display, the next step was to connect it to a monitor via the HDMI port, a mouse via one of the USB ports and to a Bluetooth keyboard.   Then I loaded the Raspbian Operating System onto the Raspberry Pi via the micro SD card.  I first copied the OS to the Micro SD card using a PC or Mac and then inserted the card into the Raspberry Pi and booted from it.  You can find a good tutorial on how to do this at https://www.raspberrypi.org/learning/software-guide/quickstart/

Once Raspbian is installed, you will have a windows like GUI (Graphical User Interface) environment with a web browser, and a number of additional applications included.

This gave me a development environment that I could use to build and test the DX Alarm Clock software.  I used the Python language to develop the software.  I used the Python IDLE development environment, which is included in the Raspbian OS.

Interested in Raspberry Pi Amateur Radio Projects?  See the article on a Raspberry Pi Satellite Rotator Interface.

Member Spotlight – B. Scott Andersen, NE1RD

NE1RD on Mt. Wachusett

Bio of B. Scott Andersen, NE1RD

I got my start in ham radio not long ago. In 2002, after years of encouragement from a good friend, I finally looked into the hobby. “You’ll love it,” my friend said. “It’s right up your alley.” I confess I was skeptical, and even a little uncomfortable watching him make a simple call on a 2m radio he had in his car. “Go ahead and talk,” he said. I was well outside my comfort zone.

I’ve tried to remember those feelings as I show new people our world. It can seem strange, and aspects of it still seem strange, even after all these years. “It isn’t just one hobby,” my friend admitted. “It’s 99 different hobbies. You just pick the ones that interest you.”

I have taken his advice, and now I’m involved in some of the ones that most intrigued me. Not long after being licensed, I entered my first contest. It was October of 2002, the sunspots were still active, and I worked over three hundred stations in just a few hours. I was completely hooked on contesting! A lot of the things that made me nervous in the car that day were absent here. There were no long conversations; they just wanted my exchange (5905), and on they went!

The thing that really captured my attention, though, was a DVD of a DXpedition run by the Microlite Penguin team and their trip to South Sandwich Island and Southern Thule. These guys were amazing! Small radios, lightweight gear, well-conceived but modest antennas, and they worked the world. This was something I wanted to do.

So, in the next few years, I spent most of my free time thinking about ham radio, and lightweight DXpeditioning in particular. Contesting just helped me increase my DXCC totals, and hone my skills. The culmination of all that thinking was captured in my blog “The 100 Pound DXpedition.” You can get a PDF of all these brief articles from a link on my website www.bsandersen.com

As part of this DXpeditioning interest, I also spent a great deal of time thinking about antennas, and portable antennas in particular. My book “Buddipole in the Field” was the result of some of this work. You can get the free PDF from the Buddipole User Group on Yahoo!, or from a link on my website. The Buddipole has provided a good platform for many of my experiments, and DXpeditions.

I’ve always been a nerd, interested in electronics, physics, mathematics, and the like. Ham radio has provided me a way to transition from the abstract to the concrete. It is one thing to think about radio theory. It is another to build a working radio. I’ve been building kits since the 1970’s, but ham radio has given me many new opportunities. I’m particularly fond of Elecraft kits having built two K2s, three K1s, and two KX1s. They are all fabulous radios, and building them was deeply satisfying.

I am still working, so ham radio sometimes takes a backseat to my responsibilities, but it is never far from my mind. I’ve also learned just a little patience through all this. Building up a country list for DXCC, and chasing various radio awards must be done over time (usually years) and it has paid off. I now have 8-band DXCC, WAS in Massachusetts, New Hampshire, and the US Virgin Islands, ARRL Challenge, and various CQ WPX awards. They look great on my wall and are a reminder that anything worthwhile requires both hard work and patience.

After all this time, I’m still very much a student of the hobby. I’m shameless about asking questions and always try to take advantage of any opportunity to see and try new things. I can only hope that this passion continues through the coming years. It has been a joy for this first fifteen, certainly!

Amazing DX Opening on the 12m Band

Today proved out some simple, tried and true advice for me – it pays to take some time and tune through the bands. I just got a Maestro Remote Control Device for our FlexRadio SDR and I took a break around lunchtime to tune through the higher HF bands to see what I could hear. We use a Flex SDR as a Remote Operating Gateway into our station and the Maestro allows me to run our station over our home network with going down to the shack.

I am not sure why but I decided to give the 12m band a look today. When I did, I was stunned! It is about noon time and the 12m band is wide open between Africa and the US!

12m DX - XT2AW Burkina Faso
12m DX – XT2AW Burkina Faso

I worked two DX stations on 12m SSB. The first was XT2AW, Harald in Burkina Faso. Harald was working split and was not real loud but I had no trouble completing the contact with him. Excited, I tuned across 12m some more and found an old friend – Theo, ZS6TVB in South Africa. I had a very nice QSO with him. We both marveled over the propagation on the 12m band that we were experiencing. He was 57-58 here in New Hampshire!

The sunspot conditions are pretty weak (SFI 85, SN 26) to create such a good opening on 12m. I believe that we may be experiencing Transequatorial Propagation (TEP) which can provide a significant propagation enhancement on paths with traverse the equator. Anita and I experienced similar TEP propagation on 10m when we were on Bora Bora Island early in 2012 with similar solar conditions.

It just goes to show that it pays to tune the upper HF bands. Especially on days when “they are not open”. Also, 10m also appears to be open to Africa right now – I am hearing a station in Mauritania

Fred, AB1OC

 

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