Abstract: A modified housing in a portable product (400, 500, 700, or 800) includes a housing detail (405, 506, 706 or 710 or 806) forming at least a portion of a loud speaker back cavity having a pipe inner diameter for a resonant pipe (408, 508, 708, or 808), and a modification to the housing detail altering a cross section area of the pipe inner diameter to compensate for changes to a loud speaker back cavity volume. The housing detail can include a battery door (404, 504, 704) for the portable product that forms at least one side of the resonant pipe. The battery door can define the loud speaker back cavity volume and further fills at least part of the resonant pipe in a manner that maintains the loud speaker back cavity volume and the cross sectional area of the pipe inner diameter at a predetermined ratio.

Abstract: A modified housing in a portable product (400, 500, 700, or 800) includes a housing detail (405, 506, 706 or 710 or 806) forming at least a portion of a loud speaker back cavity having a pipe inner diameter for a resonant pipe (408, 508, 708, or 808), and a modification to the housing detail altering a cross section area of the pipe inner diameter to compensate for changes to a loud speaker back cavity volume. The housing detail can include a battery door (404, 504, 704) for the portable product that forms at least one side of the resonant pipe. The battery door can define the loud speaker back cavity volume and further fills at least part of the resonant pipe in a manner that maintains the loud speaker back cavity volume and the cross sectional area of the pipe inner diameter at a predetermined ratio.

Abstract: A retractable antenna (100) is provided that includes a body (106) having an orifice (204), a whip (104) retractably coupled to the body (106), at least one follower (200) disposed about the whip (104), and a cam (202) disposed about the orifice (204). The cam (202) is shaped such that the at least one follower (200) interacts with the cam (202) during retraction of the whip (104) so as to rotate the whip as necessary to align the whip in a rotational position that allows full retraction of the antenna. Also provided are an electronic communication device (102) that includes at least one such non-circular retractable antenna (100), and an alignment system for rotationally aligning an extendable portion of a non-circular retractable antenna (100) during retraction.