The counterpoise (or radial) wire supplied with the AX1 is
usable on all three covered bands (20, 17, and 15 meters).
The two inductors in the base unit have been adjusted to
provide resonance close to the 20 meter band with this radial
length. Adding more radials may yield improved results on
one or more bands.
During pedestrian-mobile operation, a single “dragged
counterpoise” wire is typically used to minimize the risk of
snagging or other hazards. Optimal length for a dragged
counterpoise varies with many factors, but the length most
often used is: L (ft) = 185 / F, or L (m) = 56 / F (F in MHz).
A good starting point for elevated radials (e.g., using the AX1
with a tall tripod or mast) is a full quarter wavelength:
L (ft) = 234 / F, or L (m) = 71.3 / F.
Radial length adjustments to achieve resonance can be
tedious. An antenna analyzer is recommended.
20 m (~14 MHz) and 17/15 m (~19
MHz). Resonant frequencies may vary
+/- 300 kHz or more due to variations in
terrain, antenna height, body
capacitance, and length of radial(s).
13 feet (3.3 m) long. Wire has pre-
installed lug for transceiver attachment.
30 Watts. If RFI symptoms are observed,
reduce power or move antenna farther
from the transceiver.
Corrosion-resistant whip and hardware;
Lexan outer tube; high-Q inductors using
#20 AWG high-temp enamel wire.
Whip: 6” (15 cm) collapsed, 45” (115 cm)
extended. Base: 6” (15 cm) x 0.75” (19
mm) dia.
3.8 oz. (107 g) including supplied
counterpoise wire.
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