Carpet Loop Antenna part 2
Carpet Loop Schematics and Parts List
Carpet Loop Antenna part 2: From Radio Gnd. Ant. S1 1 pole 6 position ! ! rotary switch ! D1 ! (RS# 275-1386) !—->I—-! +———-*—-I<—-! C1 365 pf variable ! ! D2 ! capacitor (see ! ! ! text) ! o o ! S2 SPST switch ! \ ! (RS#275-406) — S2 \ — C1 D1, D2 1N914 silicon ||| o — switching diodes (Earth ! ! (RS# 276-1122) Gnd.) ! ! ! ! J1, J2 6-position terminal ! ! strip (RS#274-659 or +G-o<—-o—-+ #274-653) ! Antenna cable: ! o S1 o ! !E !A 5-conductor rotator J1 ! ! o o ! J2 cable (RS#15-1201) ! ! !D o !B ! (see text) 1 |o|—-* ! ! !C ! ! 2 |o|——-*–!–!–!–!—–|o| 6 Miscellaneous: 3 |o|———-*–!–!–!—–|o| 7 4 |o|————-*–!–!—–|o| 8 Aluminum enclosure, 5 |o|—————-*–!—–|o| 9 spade lugs, connector |o| (not used) *—–|o| 10 and cable to radio (not used)|o| (see text), knobs [To Antenna]
Note on Schematic symbols:
! -*- means: Intersecting wires are connected ! ! -!- means: Intersecting wires NOT connected !
How the Carpet Loop Works
S1, C1, and the antenna cable connected to J1 and J2 form an L-network; when S1 is switched between positions A through F, and C1’s capacitance is varied, the impedance of the antenna system changes. When S1 and C1 are adjusted for best signal, the impedance between antenna and receiver is matched. D1 and D2 provide protection against static discharges. The G position of S1 grounds the antenna when not in use. S2 disconnects the ground from the antenna, making the antenna into a random wire.
