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Ryan thanks for links 73 Paul

You may want to consider using a variable regulator for the PA supply, on long duty cycle modes

Hi Phil stuck in Customs or bloacaded by French Fisherman? Let's hope TNT use air mail?,

This reminds me of one of our students who was building himself a computer (this was about 1970). He was based in London and had a season ticket to the Promenade Concerts at the Royal Albert Hall. He

As for winding toroids, just take a couple and the wire and start winding while watching TV or some other activity. Forget counting. Just wind. After a few or a dozen take a photo with your smart

I've recently been playing with different designs of plug-in LPF for a QRP 80m tx project so I built up the QDX LPF to try alongside my collection.? My nanoVNA showed a curve and numbers much like

A good explanation, Wolfgang. It makes absolute sense. We were taught this during our training classes for the license. When operating QRP portable (SOTA etc.) I much prefer to do away with feedline

Hello Phil. I replied to your message but guess the moderator has not released my message yet. If you are just looking to upload a sketch (what the usual source files are called for the Arduino IDE)

Phil, As has been suggested there are a ton of youtube videos and other web pages telling you how to program an AVR (the ATMega328P computer chip sold by Atmel/MicroChip used on Arduino boards) . This

I think those are probably stitching via's / ground plane stitches, I suspect you'll see that there's a ground plane fill on the other side right under them too, and these 'stitch' the two sides

The?BA00JC5WT is variable..? (full disclosure I know just enough to be dangerous) if I read this data sheet correctly a veriable resister(s) could be used at pin 4 and 5? I would love to learn more

Jason, depends where you live on this planet ? You did not reveal that. 2.1 x 5.5? or sometimes '5.5x2.1' is a de facto standard, zillions are around ;-) Either you grab 'any' cheap power supply with

Hans, Yes, I guess that most start like I did. Driven to the point that a piece of gear was simply scrap unless something was attempted I looked at various descriptions of how SMD work can be done

I forgot to mention that I have taken video for all of it, but it takes time to get it all edited. Soon! -- Ryan Flowers - W7RLF MiscDotGeek - QRP and More (Website) ( http://miscdotgeek.com/ ) *QDX*

Here's where I'm at with it as of midnight on 10/30. Having the inductors pre-wound sure was handy! The next things will be installing the LED, connectors, the electrolytic to stabilize the 5v voltage

Hi Fred I'm sure you are right and that I should get proper SMD tools. My point was... Lack of the ideal tool doesn't have to mean you can't do something. I have a long and questionable history of

Note also that QDX must have a working 25MHz clock (the TCXO module). If this is not the case then the microcontroller chip would use its own internal 8MHz oscillator. The microcontroller would

Hi Mike This is not a change with QCX-mini Rev 3. All QCX-mini PCB revisions have the same PTT output jack connections with the positive-going PTT signal on the "ring". This is the same as on the 50W

The QDX is a composite USB device that contains two USB devices: a USB serial virtual port for CAT control, and an audio interface for the digital mode data. All of those should appear in their

And now: Part 5: TCXO Installation! https://youtu.be/zbZMUdm81VA -- Ryan Flowers - W7RLF MiscDotGeek - QRP and More (Website) ( http://miscdotgeek.com/ ) *QDX* News, Tips, Build Series (YouTube) (