18:1 transformer

1
PJ2TFlag Receiving Antenna
There is a free-floating egg insulator at each
corner
29
6
6
The flag is constructed with two lengths of 14
wire (top and bottom), each 43 feet long. They
are each soldered to the 181 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
FT240-31 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.
21.5
Guy ring
900-ohm resistor
181 transformer
5
5
Guy ring
Guy ropegt25-feet long
14
4
4
23.75
23.75
22
3
3
18RG-8X
2
2
29
27
6
1
1
44x 6 Fiberglass Mast Sections
K8ND 070109a
Preamplifier
8 turns on four (4) FT240-31 toroids
2
PJ2TFlag Receiving AntennaFeed Details
Wire
181 transformer
RG-8X Feedline, 18-feet. Tape to mast, from
feedpoint to ground.
RG-8X Feedline to shack, with 12V for
preamplifier
Wire
Choke 8 turns RG-8X through four FT240-31
ferrite cores.

FiberglassMast
Tape Feedline to mast near ground.
ECP-1 10 dB Preamplifier
The 181 matching transformer and the 10dB gain
remote ECP-1 preamplifier system are products of
Lance Johnson Engineering (http//www.lancejohnson
engineering.com/ECP-1.html). Any 181
pennant/flag matching transformer or preamplifier
may be used. A preamplifier is required, as these
antennas are deaf without one.
K8ND 070109a
3
PJ2TFlag Receiving AntennaBlock Diagram
181 Transformer(On Mast)
18-feet RG-8X down mast to ground.
ECP-1 Preamplifier (On Ground)
8-turn coaxial choke on four FT240-31 ferrite
cores.
550-feet RG-8XNOTE This feedline has 12 Volts
on it for the preamplifier.
ECP-1 Power Box (In Shack)
12 VDC
K1FZ KB-450-Ohm Splitter (In Shack )
K8ND 070108a