danny@alice.UUCP (07/12/83)
It was incorrectly stated on the net that if you use the center-tap and one side of the 1000-ohm winding of an impedance matching transformer you have an impedance of 500 ohms, close to the standard aircraft value of 600 ohms. Actually, the impedance ratio goes as the SQUARE of the turns ratio, so this procedure gets you 250 ohms. That's probably acceptable too, but it's better to err on the high impedance side (all you lose is a little volume), so using the full 1000-ohm winding is probably best. Dan Kahn