Presentation on theme: "18:1 transformer ~900-ohm resistor SIGNALS ARRIVAL 29’ 6’ 1 2 3 4 5 6 3 2 1 5 4 6 29’ 14’ PJ2T Flag Receiving Antenna The flag is constructed with two."— Presentation transcript:
18:1 transformer ~900-ohm resistor SIGNALS ARRIVAL 29’ 6’ ’ 14’ PJ2T Flag Receiving Antenna The flag is constructed with two lengths of #14 wire (top and bottom), each 43 feet long. They are each soldered to the 18:1 transformer at one end, and through the 910-ohm resistor on the other end, with an egg insulator included for strain relief. Total length of wire required is 86-feet. The vertical wire section is 14-feet long, and start 6-feet above the ground. There is a sliding end insulator at each corner. The feed transformer and terminating resistor are each anchored to the mast 13 feet above ground. The 18-foot RG-8X feedline connects to the transformer, then is taped to the mast below the feedpoint and run to the ground. It connects to the preamplifier, which in turn is connected to a 50- foot length of RG-8X wound 8 turns around four FT ferrite cores in a 1.5-foot coil. Each fiberglass mast section is 44 inches high when stacked, and the 6-section masts are 22-feet high. Each mast section is numbered (1-6). They are 30 feet apart, and are guyed at the top of the fourth fiberglass mast section (14’ 8” off the ground). Each of the six guy ropes must be at least 25-feet long, but are cut to 40-feet to allow guying onto random bushes as available. 22’ Guy rope >25-feet long K8ND a 21.5” 27” 23.75” 44”x 6 Fiberglass Mast Sections Guy ring There is a free-floating egg insulator at each corner Preamplifier 8 turns on four (4) FT toroids 18’ RG-8X
18:1 transformer PJ2T Flag Receiving Antenna Feed Details K8ND a Choke: 8 turns RG-8X through four FT ferrite cores. RG-8X Feedline, 18-feet. Tape to mast, from feedpoint to ground. RG-8X Feedline to shack, with +12V for preamplifier ECP-1 10 dB Preamplifier Fiberglass Mast Tape Feedline to mast near ground. The 18:1 matching transformer and the 10dB gain remote ECP-1 preamplifier system are products of Lance Johnson Engineering (http://www.lancejohnsonengineering.com/ECP-1.html). Any 18:1 pennant/flag matching transformer or preamplifier may be used. A preamplifier is required, as these antennas are deaf without one.http://www.lancejohnsonengineering.com/ECP-1.html Wire
18:1 Transformer (On Mast) ECP-1 Preamplifier (On Ground) ECP-1 Power Box (In Shack) PJ2T Flag Receiving Antenna Block Diagram K1FZ KB-4 50-Ohm Splitter (In Shack ) +12 VDC ~550-feet RG-8X NOTE: This feedline has +12 Volts on it for the preamplifier. K8ND a 8-turn coaxial choke on four FT ferrite cores. 18-feet RG-8X down mast to ground.