[Amps] 6kW Coax

[Ron Youvan]

   Steve Thompson wrote:

> I thought 35ohm was max power rating, 75ohm was minimum loss?
> Hence 75ohms being the standard for CATV.

   Actually, with everything being the same the lowest loss is from the highest impedance possible 
for the form factor, the highest power handling capacity is from the lowest impedance.
75 Ohms coax has lowest loss because for a given power rating because it has the highest Voltage and 
the lowest current which fits into the I*R = power loss formula.

   With 250 to 1,000 Ohms surge impedance the form factor "open wire feed line" (and shielded open 
wire feed line called "waveguide") posses the lowest loss and it really makes a difference when 
there are reflections, as in when you are operating off of resonance, such as the other end of the band.
-- 
    73 Ron KA4INM - All E-mail sent to this address shall linger in the Google cloud forever!