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FAQ: We already have a transmitter capable of running 300 watts. Are we ready if LP-250 was to be approved?

That depends on your antenna. If your station is running a single-bay antena such as a Nicom BKG-77 or a Shively 6812b, your antenna will have a 3 dB loss. This means that in order to run 100 watts ERP, you will have to run more than 200 watts transmitter power output.

A two-bay arrnagement of those and other antennas will give you around a 0 dB gain. This means that you will have to run less power from the transmitter thus allowing you to run up to or close to 250 watts ERP from a 300 watt transmitter.

Your feedline and any equipment between the transmitter and the antenna such as lightning arresors will also contribute to your dB loss.

Updated 2021: We have gone into greater detail about this subject in REC LPFM Advisory Letter #11. Please read that document for a more expanded answer to this question:
https://recnet.com/node/3382

Topics

LPFM technical operations

Answer Date

Tue, 07/27/2021 - 12:00

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FAQ: We already have a transmitter capable of running 300 watts. Are we ready if LP-250 was to be approved?