I recently picked up a Commodore 16 at an estate sale for a pretty good price. When I got it, it looked like it was covered in 35 years of dirt and grime. The image below is after a quick wipe down. They didn’t have the power supply for it, which was fine. I decided to go ahead and clean it up before attempting to power it on. The inside was pretty gross too.

I don’t remember where I originally picked up this little Motorola speaker, but I found it again while digging through a box of stuff and figured I could make use of it on the bench. The model of the speaker is TSN1003A. I couldn’t find much info about it and I didn’t have a connector that would fit it, so I decided to hack it up and put my own connectors on it.

I know it’s been a while, but I promise I’m not dead. I’ve just been working on other non-techy stuff lately. There are a few projects that I’ve been working on here and there that I’ll post soon. I’ve been playing around with some of the cheap aliexpress kits like automatic antenna tuners and rf amplifiers. I also bought a few lora boards and have one set up as a satellite ground station and a few others running as a mesh network.

I picked up a few radio kits off of Aliexpress a while back. I started a few and left them in various states of partial assembly.

After putting up my efhw antenna, I wanted to test a few other bands. I’ve never done much with 80 meters, so I figured I’d give it a try with a raspberry pi WSPR transmitter. To do that, I needed a filter for 80 meters to suppress the harmonics from the square wave from the raspberry pi. I found a good video by ZL2CTM showing his experiments with an 80 meter bandpass filter.

I’ve been wanting to get back into radio stuff for a while now, but the only antenna that I have up now is a 40 meter dipole. I’ve been wanting to put together a decent multi-band antenna for a long time and finally settled on an end fed half wave antenna. An end fed half wave antenna, or efhw, is a variation of a half wave dipole, but it is fed from one end.