Cydrome Leader wrote:
wrote:
?
? I found a link to some 5.5" heilical air dielectric that doesn't look
? too bad, but the specs stop before a GHz. look at the power handling
? spec at .5 MHz, and at 894 MHz. It drops from 1890 KW to 43 KW. The
? insetion loss goes from .0045 dB to .215 dB over that range.
?
? http://www.rfsworld.com/dataxpress/D.../?q=HCA550-50J
how does one terminate such cables? What sort of wiring goes on inside a
giant transmitter or the antenna end of such a monster?
A matching network to get it as close to the characteristic impedance
of the cable. The antenna is designed for the same impedance to get the
maximum signal into the airwaves. 50 ohms is the nominal impedance for
these systems
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