Hi Michael
I vaguely remember that project. I seem to recall some constructors having trouble calibrating etc due to switch and other stray resistance. Switch resistance is mentioned in the article I notice.
Strays of any flavour can play a significant and disruptive part in most things. I remember when I was working we had a 40kW HF transmitter which flatly refused to tune above about 20MHz. This was a new unit and when it was built the fitters had wired a range change switch with the wrong size wire. It was too thin and so introduced so much stray inductance the coils that were meant to do this job had no effect and were completely swamped by strays. Same with bypass caps on the pre amp valve (valves???) sockets. The legs had been left full length instead of cutting short and the stray L disrupted the auto tuning process dramatically.
The text and background you linked should be on everyones reading list. If everyone did this it would save a whole heap of explanations.
Cheers Bob
