[BC] BC-1G Advice

[RichardBJohnson at comcast.net]

Well he could find that out.

impedance = (138 / e^(1/2)) * log (D/d)

e = dielectric constant 1 for air, 2.2 for polyethylene, 2.0 for Teflon.
D = inside diameter of the shield.
d = outside diameter of the inner conductor


--
Cheers,
Richard B. Johnson


  -------------- Original message ----------------------
From: harold stanton <k5gvr at hotmail.com>
 >
 > Being a "tad" older than many of you, it would NOT surprise me to 
find that the
 > Xmtr-Atu line would be older 72 ohm poly cable.
 >  There was a plenty of it in the 50's and 60's left over from WWII.
 >  And was rather cheap AIRC.
 >  The resistance difference noted in the series of the discussions 
leads me to
 > suggest this may be a possibility.
 >  Then the line current would be = to 1000/ sqr72 ( 13.888a)=3.72A 
line current.
 >  That would put the transmitter in a bit better set of parameters.