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I use one on about 10 feet of pipe that is sitting on the ground. 10 -17 meters with a tuner. Using it for psk31 at about 20 watts. No problems into Europe or S. America.
There are some articles showing how to put resistors inline with the fan power wires. It says what size of resistors to use to have the fans run at half speed. Should be easy to find...
Do you want to know if it will TX & RX 42.7 mhz or 30 meters?. Those are altogether different frequencies.
42.7 mhz is in the 7 meter band. And 30 meters is 10 mhz...
here is the conversion page
Online Conversion - Frequency Wavelength Calculator
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