Currently, most multi-band antennas use traps, log cells or interlaced
elements as a means to cover several frequency bands. All of these
methods have one thing in commonthey significantly compromise
performance. The SteppIR antenna system is our answer to the
problem. Resonant antennas must be made a specific length to operate
optimally on a given frequency.
So, instead of trying to trick the antenna into thinking
it is a different length, or simply adding more elements that may
destructively interact, why not just change the antenna length?
Optimal performance is then possible on all frequencies with
a lightweight, compact antenna. Also, since the SteppIR can
control the element lengths, a long boom is not needed to
achieve near optimum gain and front to back ratios on 20 -
Each antenna element consists of two spools of copper strip
conductor mounted in the antenna housing. The copper strips
are perforated to allow a stepper motor to drive them simultaneously
with a sprocket.
Stepper motors are well known for their ability to index very
accurately, thus giving very precise control of the antenna
In addition, the motors are brushless and provide extremely
long service life.
The copper strip is driven out into hollow, lightweight fiberglass
support elements, forming an element of any desired length
up to 36 long. The fiberglass poles are telescoping,
lightweight and very durable. When fully collapsed, each element
measures 53 in length.
The ability to completely retract the copper antenna elements,
coupled with the collapsible fiberglass poles makes the entire
system extremely portable. The antenna is easy to assemble,
and can be installed on the ground or up on the antenna tower
using our Boomslide assembly system.
The antenna is connected to a microprocessor-based controller
(via 22 gauge conductor cable) that offers numerous functions
including dedicated buttons for each ham band, continuous
frequency selection from 20m to 6m, 17 ham and 6 non-ham band
memories, 180° direction reversal or bi-directional mode
in just 2 seconds (yagi).