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EIRP for the "600 meter" Band

R

rfry

The FCC may permit use of the band 472-479 kHz by licensed amateur radio operators, using either 1 watt or 5 watts of effective isotropically radiated power (EIRP) from an antenna not exceeding 15 meters in height.

EIRP is the product of the power applied to the antenna feedpoint and the antenna system gain, where the antenna system gain is referred to that of an isotropic radiator. An isotropic radiator is a theoretical source that radiates equal power in all directions.

Knowing that EIRP this will require knowledge of the net gain of the antenna system. NEC software will be useful in determining that gain.

As an example, for a 15 meter high monopole on 475.5 kHz with a total of 50 ohms of system loss for the loading coil and r-f ground connection, NEC shows about -18.35 dBi for the peak gain of the antenna system.

The link below then is useful to calculate the transmitter output power needed to produce a given EIRP with that antenna system.

To produce 1 watt EIRP with the above antenna system requires about 68.4 watts of Z-matched power at the antenna input terminals. For 5 watts EIRP it would be 5X that, or 342 watts.

http://www.csgnetwork.com/antennaecalc.html
 
Maybe if you change your username and IT address, you will be able to join in a discussion on the same website on which it originated.
 
I guess you mean IP address. But over a year ago and for good reasons, I unsubbed myself from that website -- not that the Chief Cook & Bottle Washer there blocked my posts or membership at that time, although now he probably would.

In any case, comments you care to post in this R-I thread in response to my opening post here will be of interest, and might even be read by a greater audience than would read such an exchange on that other board.
 
Readers of this and other threads on R-I probably will note the evasion of some members here from providing a direct response here to certain technical issues presented here.
 
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