This document describes the equipment that will be provided to
teams for WRTC2014.
All competitors will be located in the same
geographical region with similar topography. Competitor locations
will be separated by a minimum of 500 meters.
WRTC2014 will be a Field Day style competition. Equipment that
will be installed by the organizers at each site:
40-foot (approx 12m) tower with an antenna rotator and control
20/15/10 m Cycle
24 TX38 tri-bander
with one feed line (150 feet of Times LMR400DB) and PL-259 male
connector. Antenna details: http://www.cycle-24.com/antennas/tx38-triband-yagi/
- 40 m
Inverted-V dipole with feed line (150 feet of Times LMR240) and
PL-259 male connector.
- 80 m
Inverted-V dipole with feed line (150 feet of Times LMR240)
and PL-259 male connector.
WRTC2014 Two-channel Power Monitor
The power monitor acts on forward power only, which may be
greater than the actual transmitted power when the SWR > 1:1. In
order to transmit 100 Watts to an antenna off the resonant
frequency, an external tuner may be used to bring the SWR down
and avoid premature triggering of the power monitor.
- 2 x
3-foot (1 meter) RG8X jumpers, PL259 on each end for connecting
Tent 13 feet x 10 feet (approx 4 m x 3 m)
- 2 x
36″ x 36″ (91 x 91 cm) wood panel to go under chair
- 2 KW
Power Generator with power cable going to the tent.
Uninterruptable Power Supplies, 12 V accumulator batteries or
similar power sources are allowed for power backup. Exception:
built-in batteries in portable computers, audio recorder, or
other peripherals. CMOS memory backup batteries are allowed.
gallons of gasoline for generator
Ground wire connected to ground rod driven near cable entrance
- 2 x
6-outlet 115VAC power outlet strips (more
details about AC power)*
No additional electric cooling devices are allowed such as air
conditioners or refrigerators. Additional fans may be used, but
be aware of the power consumption of the generator.
folding tables 34 x 34 inches (approx 86 x 86 cm)
cabin with hand wash facilities
gallons (32 L) of drinking water*
Competitors are not allowed to substitute any equipment except
for those items marked by an asterisk.
Since this is a field day style operation each team will have a
generator which has to be filled with gasoline. To avoid team
members spending their time re-filling the generator, the organizers
will provide dedicated volunteers at every location to ensure the
generator is kept running during the contest period.
It is highly recommended, but not required, that each team
provide a “triplexer” device for the triband antenna. The function
of the triplexer is to provide discrete band ouputs using one
coaxial feed. This allows operation of the tri-band antenna on two
It is up to the team to provide such a device, but it must not
amplify the signal in any way.
There are several commercial manufacturers of triplexers. Typical
are available here.
For details on building your own triplexer, refer to June 2010
QST “HF Yagi Triplexer Especially for ARRL Field Day”. By K6KV
Typical SWR vs. frequency curves for TX-38 tri-band antenna
TX-38 SWR 20 meters
TX-38 SWR 15 meters
TX-38 SWR 10 meters
SWR Curve for 40M Inverted Vee
SWR for 80M Inverted Vee in CW
SWR for 80M Inverted Vee in SSB