[Antennas] 93 ohm coax

[K1TTT]

That's if you feed them as twin lead.  If you parallel the shields and
center conductors it works like resistors in parallel, 93/2=46.5


David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://www.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://dxc.k1ttt.net
 

> -----Original Message-----
> From: Andy [mailto:ingraham.ma.ultranet at rcn.com]
> Sent: Sunday, August 30, 2009 19:30
> To: antennas at mailman.qth.net
> Subject: Re: [Antennas] 93 ohm coax
> 
> > Also, when using 2 coaxes to create twinax
> > equivalent, how do the discrete impedances of
> > the 2 coaxes add?
> 
> They add directly.  There is no interaction because each line is shielded,
> so 2 * 93 = 186 ohms (differential mode characteristic impedance).
> 
> Andy
> 
> 
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