Here is a status of the projects I’ve been working on:
MFJ-929 Auto Tuner: done
Got this one a few years ago and it ended up on a corner.
One IC seemed dead, a 5V reg was cooking, and the PIC16 too.
Replaced the three, reprogrammed a new PIC16, and the unit seems to work fine, all self tests passes.
Can also works as a 200W power meter on 1.8-30MHz and seems okay.
HP Spectrum Analyzer: wip
Did some more measurements that looked good, got a good frequency meter and measurements done with it seemed ok too.
I have got a TinySA to advance more into the repairs.
Mr Carlson Lab Cap tester: nearly done
Someone shared on the patreon community a ‘digital’ version of the first cap tester.
I have built it, I need to programm it and calibrate.
AOIP Calibrator: wip
Got an AOIP PJN5208 Calibrator, the logic board has many issues.
Unsoldered ICs, a cooking regulator.
I’ve found an older schematics, and got the required parts, time to reassemble everything, do some tests and see how it works.