A method for calibration of RF paths of a frequency hopping adaptive base transceiver station is provided. The toner is suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like. When the amplifier is not in operation, the other switch is turned on for transmitting the GPS signal from the GPS antenna to the TEL antenna side. The wings can include alternating upper wings and lower wings, and there can be depressions formed in the fin top. The method may include during operation of both the HPP and LPP, adjusting operation of the LPP in response to pressure fluctuations at an inlet of the HPP.