The Repair and Refurbishment page

This page came about after restoring some long-lost, newly discovered, old antennas (summer-winter 2021).
Restauration took place near the end of the 2nd year of the corona pandemic (a bit of time at hand).

The first articles were written in Dutch language for distribution to our local club members.
These pages have a translation button at the top, hence easily converted to any language.
This page is a work in progress, articles will be added from time to time.
(it may take a while before I manage to publish some of the troubleshooting projects on a Kenwood TS-940S and Yaesu FT-1000MP)

The content is not super-technical - rather light-hearted - but here and there, there may be a useful hint to someone.

73 - Mark - on4ww (April 2022).

The Pipe Rack Saga : a narrative on my old pipe rack which gave way during a storm, resulting in the find of some old antennas of which I had forgotten their existence; restored these antennas; this is the first article which prompted some more to follow

Experimental attempt to Increase/Enhance the Bandwidth of a Yagi Driven Element

Repair/Refurbishment of a faulty Cushcraft R7 Vertical

A 12 element 2m/144MHz Yagi - History, Refurbishment, Present and Future with a 'twist'

A 160m reduced-size half sloper antenna and a 60m half sloper antenna as sidekick

Restoration of a Cushcraft A3WS/A103 WARC band Yagi and some history of a Comet CA-2x4WX collinear VHF/UHF vertical and its future

Restoration of a Butternut HF6V 6-band vertical


KENWOOD TS-940S repair

Reduced power problems in some or all modes
Before starting any attempt to 'measure' what could be at fault: clean ALL connectors on ALL circuit boards.
I do not mean removing and 're-seating' connectors. I mean: clean them with an appropriate fluid (e.g. Kontakt 61 to clean, and rinse with Kontakt WL).
Even after cleaning and re-seating, I have observed remaining bad contacts.
Meaning, I did not do a good cleaning job. Or perhaps the oxidation was too severe for Kontakt 61 to be useful. Perhaps the more agressive variant Kontakt 60 should be used.

Once all connectors have been well cleaned, I'm pretty sure a lot of the reduced power related problems, will be history.
If not, the time has come to start looking for faulty bad solderings. Inspect all circuit boards with big magnifying glasses or even a microscope.
After fixing all bad solderings (there will be quite a few) and the radio still operates erraticaly, time has come to make measurements and look for faulty components on the circuit boards.

More detailed info on specific TS-940 repairs to follow, but thought this connector-cleaning thing to be important enough to mention it upfront.
I have lost a lot of time in repairing TS-940S' because of bad contacts in connectors not being handled as a first step.

YAESU FT-1000MP repair

I plan to start documenting my 1000MP repairs on this webpage in 2024.