Re: Balun

>Paul,
>
>>>Balun is a short form for Balanced Unbalanced.
>>>
>>>This is like Modem being a short form for Modulate Demodulate.
>>>
>>>I think it's the twisted pair that is balanced and the twinaxial that is
>>>unbalanced, but it might be the other way around.
>
>>I'm not so sure....  they might -both- be balanced.  Although I was told
>>early on that Twinax used one of the center conductors for xmit and the
>>other for receive, it might really be a balanced circuit.
>>
>>If both are balanced, the big difference would be the impedance and
>>voltages in the circuit.
>
> From what I understand (and in my hands-on experience w/ early
>implementations of twisted pair), it's the twisted pair circuit that is
>unbalanced, so baluns are required to balance the load.
>
> -mark



I'm almost 100% positive (99-44/100%?) that the twisted pair circuit is
balanced.  The balanced configuration means that any electrical noise will
affect both wires of the pair.  When the signal hits the balun (a
transformer), the interference 'runs into itself,' electrically speaking,
and cancels itself out.

--Paul E Musselman
PaulMmn@ix.netcom.com


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