BARKER & WILLIAMSON
603 CIDCO ROAD
MODEL TR TRAPS
MODEL LC LOADING COILS
COCOA, FL 32926
321-639-1510
Power Rating: 1000W PEP
500W Output
Barker & Willamson traps are ruggedly constructed in a weatherproof plastic enclosure with stainless steel hardware.
Loading coils are wound on top of weatherproof plastic, and covered with a heat shrink sleeve. They will provide many
years of trouble free service. This guide will assist in design and usage of these items. Remember that all short dipole
antennas will have a bandwidth narrower than a full size half wave dipole. Therefor, an antenna tuner may be helpful.
Installation is best done as an inverted Vee. Satisfactory results may be obtained with the center as low as 20 feet, however
30 feet or more is recommended. If a flat top installation is desired, it is best to have the center supported due to the weight
of the traps/loading coils and coaxial feed line.
Assemble the sections of the antenna together paying attention to the figures. The wire segment lengths shown in the table
are your starting point for tuning the antenna. When you cut the wire, leave plenty of excess for making connection and
lengthening if necessary. Make sure that you make temporary connections as shown in figure 3. Raise your antenna, and
check the VSWR on the highest frequency band first. If the resonant frequency is low, shorten the wire segments. If it
is high, lengthen the wires. After the desired frequency is achieved, make permanent attachment for these segments as
shown in figure 2, trimming off excess wire. Repeat this procedure for each band, going from highest to lowest frequency.
WARNING
Outdoor antennas and lead-in conductors from antenna to building shall not cross over electric light or power circuits
and shall be kept well away from all such circuits so as to avoid the possibility of accidental contact. Where proximity
to electric light or power service conductors of less than 250 volts cannot be avoided, the installation shall be such so
as to provide a clearance of at least 2 feet. Where practical, antenna conductors shall be installed so as to not cross
under electric light or power conductors.
Figure 1: Wire and trap arrangement (one side only). Refer to table.
Figure 2: Permanent hookup. After passing
through the eybolt, wrap the wire around itself
Figure 3: Temporary hookup for
tuning. Loosely twist and tape ends in.
5 times before soldering to the terminal.
12/00
derevoCsdnaBtFhtgneLxorppAABCtFWtFXtFYtFZ
02,019201RT"5'8'6
02,51,013201RT51RT"5'8"31"12
04,02,013401RT02RT"5'8'6'7
08,02,0170101RT02RT"5'8'6'93
04,02,51,011501RT51RT02RT"5'8"31"12'41
08,04,5100151RT04RT'21'61'22
061,08,04,5147151RT04RT08RT'21'61'22'73
08,04,51072CL04RT'21'9'41
04,026502RT'81'21
08,0202102RT'81'34
08,04,0240102RT04RT'81'5.8'21
061,08,04,0263102RT04RT08RT'81'5.8'21'03
061,08,020712CL08RT'81'03'83
061,03491CL'22'52
08,048904RT'33'61
061,08,04051A04RT1CL'33'22'02
061,0800208RT'36'73
WARRANTY STATEMENT
Barker & Williamson guarantees each product to be free from defects in material and workmanship for 90 days from date of
purchase. The warranty applies to the original purchaser only, and we will repair or replace the product at our discretion. Under
no circumstances will Barker & Williamson be liable for any damages or consequential damages arising from use or misuse of
our products. Warranty is voided if product is subject to misuse, neglect, accident, improperly installed or used in violation of
the instructions furnished by us. We reserve the right to make changes in design at any time without obligation to update
previously manufactured models. This warranty is given in lieu of any other warranty, expressed or implied.
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