Antenna Tuner Details and Files

Ok first off, there is no full schematic for this board, I have already moved on to adding new stuff to it and changing how some parts of it work so I can add in new features. So the best i can offer is this extract that shows where the pins on the micro go to.

Secondly, I wont be releasing my code, the reason is that I do not program using the Arduino IDE and teaching everyone how to program in GCC, to install all the tools required, and uploading the code using an external programmer is beyond my ability to teach anyone let alone everyone. There are just to many things that can and will go wrong and it will only make my life miserable trying to help everyone.

That said, the ESP32 can be programmed in Arduino and the actual basic code is not that hard to write yourself. Turn a encoder and it steps through the relay combinations.

With these relays, I would not put much more than 50w though them. Though the data sheet says they will take 1A but that makes them marginal at 100w. As it stands I think 50w is a very safe bet.

Components:
Relays: Omron G5V-1 5V subminiture.
Transistors: PDTC114ET pre-biased SOT23
Caps: 1206 or 1210 Ceramic Multi-layer 1Kv or higher rated, for tuner, 50V 100nF for bypassing. 1uF across the coils of the relays.
Voltage Regulators: 5V and 3.3V 1117 variants SOT223 package.
Toriods: T68-2 T50 would be suitable also, its just what I had, 2,4,8,12,20, 24 and lots of turns.

Schematic as best as i can show without causing confusion because of changes i have made to it. Yeah sorry about that.

Top side of the board as 3d rendered.

Bottom side of the board, 3d rendered.

The board as built by me.

DOWNLOAD: auto antenna tuner_gerber

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It Did Not Work

 

I was bored yesterday so i thought i would try building an amp from these transistors I have sitting in the box. Ummm yeah I smoked it pretty hard before I even got any significant power out. I think the main thing is that I could not drive it hard enough to get it into the linear region and I might have had a bit to much bias happening. I will try again, but from what I was reading online, these transistors have a habit of wanting to detonate.

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New Country, St Lucia

This is a turn of events for my blog, I actually did some operating today. In fact it is even worse than that, I turned on the 2m fm rig and put it in scan mode and sat listening to a club net for a good 30mins while i did stuff for work. Shocking I know, but, you know what? It was not all that bad, at least the conversation was not about the weather, medical conditions or tomatoes.

So that got me excited enough to fire up the Icom and do a little FT8. A bit on 20m, a bit on 40m and I managed to work a new one for me on 40m. I did hear this station on 20m and pskreporter said he was hearing me, but never did see a CQ, so im thinking he might have taken a break from it. Anyway, got him on 40m and that is good enough for me.

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