After I built my 40m QCX transceiver, I needed a case. I stumbled across a 3D printed case made by Mike Erskine (W4MHZ). I wrote to Mike, asking him how to purchase one of his cases. To my surprise, he sent me one for free, thanking me for my videos in the process!
Here’s a photo of my QCX in the W4MHZ case. I used my sidecutters to make a couple of little nibbles in the plastic to make mine fit perfectly.
I’m very happy with it!
Mike is only charging $20 plus $5 shipping. This is a good price. If I had taken the time to design and 3D print my own case, I would have spent a lot of time and used up a lot of filament. $25 is a bargain.
To get yours, contact Mike via email at: email@example.com
I purchased the 40m version of the QCX kit a while back. Seeing Hans Summers (QCX designer) at the recent Four Days in May event made me very excited about this little rig so I came home and built my kit. What an awesome little CW-only radio – for only $49!
In this video, I review the QRPGuys.com End-Fed Half-Wave Mini Tuner. This is a $25 kit that will tame the high impedance of an End-Fed antenna. With this, you can deploy a half-wavelength of wire without feeding it in the middle (like you would for a traditional dipole).
Easy to build. Works great. A nice little kit for your building pleasure!
In this video, I explain how band-pass filters can reduce or eliminate QRM (interference).
Using a spectrum analyzer, I demonstrate a band-pass filter that I built based upon an article I found in the September 1988 edition of QST magazine. The article can be read here:
Here are the basic tools that you will need for electronic projects. It’s a great time to tinker with electronics because there are so many radios, antennas, tuner, and other gadgets available as kits. Of course, you can “homebrew” your own gizmos, too!
Using a well-known circuit, I show you how to build a simple computer interface so your logging software can send CW through your radio.
The logging software simulates someone using a straight key. It changes the voltage on an RS-232 pin and the electronic circuit uses a transistor as a switch, grounding the lines as though someone grounded the contacts of a straight key.
This interface will let you work a contest or pile-up using your logging software – without having to use a key or paddle.
The circuit diagram: http://www.n3fjp.com/cwschematic.html
N3FJP website: http://www.n3fjp.com
Tripp-Lite USB to Serial Converter: See it on Amazon.com
In this video, I show you one of my favorite places to work portable on Sunday mornings. (It’s a business park a couple of miles from my house and nobody’s working there on Sunday mornings.)
I made a few contacts (one shown in the video) before I rode my bike home to watch football.
I finish the video by making an argument for the Elecraft KX1 vs. the OHR 100A. To me, an internal keyer is a necessity in a CW-only QRP radio. That option pushes the OHR 100A up to $220. For $80 more, the Elecraft KX1 is a more capable, modern radio with a digital display – and it has upgrade options that aren’t available for the OHR 100A… like two additional bands (4 bands, total) and an internal antenna tuner.
I finished building the 40 meter version of the Oak Hills Research 100A QRP transceiver. I also added the internal keyer.
In this video, I share my final thoughts about the build and the radio.
Summary: It’s a great radio and I encourage you to build one. The documentation could use some tweaking to make it easier to understand a few of the more confusing steps. However, I built it without help and it worked right out of the gate. If I can do it, you can do it!
I’m in the home stretch of my OHR 100A 40m radio build. I’ve finished populating the board with all components.
The next step is to mount the board in the chassis and solder the wires to the knobs on the front panel. Then, comes the final step… alignment.
I expect to finish this weekend and take it for a spin. More later…
I’ve got most of the (many!) capacitors installed, along with the crystals, etc. The kit is coming along nicely and I’m enjoying it.
My friend Doug Miller (W4DML) says. “Soldering is Therapy.” I think there’s some truth to that. When you’re soldering, you’re concentrating so much on what you’re doing that any other thoughts are pushed out of your head. So, anything that’s bothering you goes away when building something.
Handling any object (like a soldering iron) that is 700 degrees Fahrenheit will cause one to concentrate – or suffer the consequences.