Re: Balun

Pete Hall wrote:

> That's what they told me in school. A balun is basically just a
> transformer that matches two different impedances. If impedances aren't
> matched, you lose a lot of power. Consequently, components heat and
> signal strength is attenuated. Take a common example:
> 
> 8 ohm output impedance from an audio amp at 50 V.
> 2 8 ohm speakers in parallel - put a second speaker in the kitchen (= 4
> ohm impedance) amplifier output power is 8 * 50 = 400W (p = ei)
> A lot of the output never makes it to the speakers.
> Since by ohms law, i = e/r = 50/8
> And since power also can be stated as p = i*i*r
> Using the same voltage and current throught the 4 ohm output, (2500/64)
> * 4 = 156.25W The balance of the output (243.75W) is in heat, mostly
> generated in the amplifier collector circuit. There is a phase shift due
> to circuit inductance, but not enough to change the results a lot.
> 
> I can't believe I still remember any of this stuff.
> 
> Pete

Better memory than mine!  Doesn't the phase shift contribute to "jitter"
thus degrading the signal, especuially as speeds and distances increase?
......Bill.........
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