SteppIR Design
Currently, most multi-band antennas use traps, log cells or interlaced elements as a means to cover several fre-
quency bands. All of these methods have one thing in common–they 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 - 10 meters.
Each antenna element consists of two spools of flat copper-beryllium tape conductor (.54” Wide x .008” Thick)
mounted in the element housing unit. The copper-beryllium tape is perforated to allow a stepper motor to drive
them simultaneously with sprockets. Stepper motors are well known for their ability to index very accurately,
thus giving very precise control of each element length. In addition, the motors are brushless and provide ex-
tremely long service life.
The copper-beryllium tape is driven out into a hollow fiberglass elements support tube (see below), forming an
element of any desired length up to the limit of each specific antenna model (a vertical uses only one side). The
fiberglass elements support tubes (poles) are telescoping, lightweight and very durable. When fully collapsed,
each one measures approximately 48” in length. Depending on the model, there may be additional extensions
added to increase the overall element length.
The ability to completely retract the copper-beryllium antenna elements, coupled with the collapsible fiberglass
poles makes the entire system easy to disassemble and transport.
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 40m to 6m (depending on the model). There are also 17 ham and 6 non-ham band memories and
you can select a 180° direction reversal* or bi-directional* mode and it will adjust in just about 3 sec-
onds (* yagi only).
Boom
Element Housing Unit
Element Support Tube
Stepper Drive Motor
Copper Beryllium Tape
2112 116TH AVE NE SUITE 1-5, BELLEVUE WA, 98004 WWW.STEPPIR.COM TEL: (425)-453-1910 FAX: (425)-462-4415
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Содержание BigIR - MK IV Vertical
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