Re: Improving Selectivity In Vintage Receivers
That's as good an estimate as you're going to get. To measure coupling factor you can measure the inductance of one coil while shorting the other and thus measure the leakage inductance. In theory a bit of maths will get you to what you want. In practice you'll run into stray resonances which spoil your efforts. Picking a number then twiddling it until what you see fits models under circumstances more like what it will be run under is the best you really can do.
You'll see some people with an almost legal bent wanting proof beyond any doubt for some things, but real situations can get sufficiently complex quite quickly that they become non-analytic to all intents and purposes. The three body problem hasn't been solved that I've heard of (Google it and you just get people trying to flog you books by that title... so much for google nowadays!)
There is an art in knowing when to stop trying to analyse and to go empirical. Sometimes it's the only way to make any progress.
David
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Can't afford the volcanic island yet, but the plans for my monorail and the goons' uniforms are done
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