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Vertical Antennas (BigIR, SmallIR and CrankIR)

Click here for more information on CrankIR Series Antennas

 

Steppir Verticals are the only true ¼ wave continuous coverage antennas available for the HF bands. The SteppIR technology has had a profound impact on improving vertical antenna performance over that of traditional designs - there is no substitute for having a true 1/4 wave vertical on every frequency within the coverage range, without having to “trick” the antenna into being resonant.  Being able to adjust the length of the element allows the Steppir vertical to be mounted nearly anywhere and still provide a good match to your transceiver. As with all ¼ wave verticals, ultimate performance depends a good radial system. Steppir verticals can be ground mounted or elevated above ground.

BigIR Vertical

Vertical Specifications

Specs BigIR SmallIR
Element Length 33 ft / 10.05 m 18 ft / 5.49 m
Minimum suggested radials
(for ground installations)
12 12
Weight 15 lb / 6.8 kg 12 lb / 5.4 kg
Wind Load
2 sq ft / 0.19 sq m 1 sq ft / 0.9 sq m
Wind Rating

0 guys: 50mph / 80kmh
1 guy: 70mph / 112kmh
2 guys: 100mph / 160kmh

100mph / 160 kmh
Adjustable Elements 1 1
Power Rating
3 KW 3 KW
Frequency coverage 6.9 – 54 MHz 13.9 – 54 MHz
Tuning Rate 0.7 ft per second 0.7 ft per second
Control Cable 4 wire 22 AWG shielded 4 wire 22 AWG shielded

BigIR and SmallIR Coil Option

Specs BigIR 80m coil SmallIR 80m coil SmallIR 40m coil
Ham band coverage 80m, 60m 80m, 60m, 40m, 30m 40m, 30m
Power rating 1500w 500w (80m, 60m)
1500w (40m, 30m)
1500w
Dimensions 9.5″w x 14″ h x 7″ deep 9.5″w x 14″ h x 7″ deep  9.5″w x 14″ h x 7″ deep
Weight  4.5 lb 4.5 lb  4.5 lb
Additional
Cable requirement
4 wire
22 awg shielded
4 wire
22 awg shielded
4 wire
22 awg shielded

 

Product Features

 

Image
(click for  detail)
Part
Number
Description
 BigIR Vertical  00417 BigIR Mark IV Vertical 40m-6m:  1 x 32 ft adjustable element, continuous coverage 6.9MHz – 54MHz, 15 lb weight, 3000w power rating, includes SDA100 basic controller, guy hardware kit and mounting post.
 SmallIR Vertical 00218  SmallIR Vertical 20m-6m: 1 x 18 ft adjustable element, continuous coverage 13.9MHz-54MHz, 12 lb weight, 3000w power rating, includes SDA100 basic controller and mounting post.
 SDA 100  09128 SDA100 Controller: Standard for all antenna models; Basic controller includes: 3/4 wave mode, auto-retract, manual band change, manual adjustment of element.CLICK HERE   for the Electronic Controller Information page
Transceiver interface  01321 OPTIONAL Transceiver Interface for SDA100 controller:  Automatically adjusts each element of the antenna as the radio tunes.  Requires a transceiver interface cable.  CLICK HERE to see which interface cable you will require for your radio.
 Tuning Relay  01322 OPTIONAL Tuning Relay for SDA100 controller:  Lock-out relay connects via PTT cable to RF power source and prevents the amplfier from transmitting while the SteppIR antenna is being tuned.  Helps prevent potential mismatch issues that could damage the antenna.
 ALP Module  09130 OPTIONAL Advanced Lightning Protection (ALP) Module for SDA 100 electronic controller:  Each driver chip has a relay in front of it that protects against lightning, nearby lightning incident and dead shorts.  Module will only work if the antenna is not in the process of adjusting when the event occurs.
 Remote Driver Board  09132 OPTIONAL Remote Driver Board for SDA 100 electronic controller:  The remote driver board is mounted near the tower base.  12 conductor control cable is run from antenna to the remote driver board, and then CAT5e cable can be used to connect from remote driver board to hamshack, up to 2000 feet away.  Requires a power source.  Advanced lightning protection (ALP) module is included with this option.  Remote driver board comes with an aluminum mounting plate but does not come with an enclosure.
stock photo
03122 Control Cable: 4 wire 22 AWG shielded control cable, outdoor rated, NON-buriable.  Available in 1 foot increments.  Lengths over 200 feet require the 33v power supply or the remote driver board option.
  03422  OPTIONAL Control Cable, coil option: 2×4 wire 22 AWG shielded control cable, outdoor rated, NON-buriable.  Available in 1 foot increments.  Lengths over 200 feet require the 33v power supply or the remote driver board option.  This cable is only used if the coil option is selected for the BigIR or SmallIR.
 25 pin dsub  03650 DB25 dsub Field Splice: The db25 field splice is used to connect the control cable to the SDA 100 electronic controller. The field splice consists of 3 terminal headers that are mounted to a PCB board, which is in turn connected to a male DB25 connector.  The control cable is connected to the splice using the included wiring diagram.  Having the field splice allows for exact lengths of control cable, with lengths available to the nearest foot.  In addition, if the cable is being run into a conduit, it eliminates the need to cut off the connector.

Ground radials

STOCK PHOTO

06030  20m-6m Ground mount radial kit: Consists of 4x 16 awg insulated wires 9 feet long, terminated to a single lug.  Highly recommend a minimum of 3 sets (12 wires) to obtain reasonable performance, more is better.

Ground Radials

STOCK PHOTO

06031  40m-6m Ground mount radial kit: Consists of 4x 16 awg insulated wires 16 feet long, terminated to a single lug.  Highly recommend a minimum of 3 sets (12 wires) to obtain reasonable performance, more is better.
 Elevated Radials 06032  Elevated radial kit: 2x 16 AWG insulated wires 32 feet long, terminated to a single lug. Above ground installations require one set of 2 radials per band of operation, and must be trimmed to size.

Ground Radial Kit

STOCK PHOTO

06033  80m-6m Ground mount radial kit: Consists of 4x 16 awg insulated wires 40 feet long, terminated to a single lug.  Highly recommended a minimum of 3 sets (12 wires) to obtain reasonable performance, more is better.
 1:1 Balun - External 06011  OPTIONAL 1:1 External Balun: 5KW Choke balun in waterproof housing with SO239 connectors.  Highly recommended for eliminating potential for RF to enter ham shack via control cable wires.
 Guy Ring Kit 09602  OPTIONAL 2nd Guy Hardware Kit: Consists of a clamshell guy mount, 3 stainless steel guy rings and hardware for installing a second guy wire kit.  BigIR comes standard with a single guy (70mph rating), SmallIR does not require a guy for 100mph rating.
 Dacron Rope 06303  OPTIONAL Dacron Guy rope:  3/16″ dacron rope, 50 ft minimum length
 16 wire Voltage Suppressor  06108 OPTIONAL Voltage Suppressor: Line filter (8 conductor) for filtering ESD and other unwanted voltages from the Control cable. Made by Array Solutions.  A better option would be the 09130 Advanced Lightning Protection (ALP) module, which internally protects the SDA 100 controller by relaying out the driver chips in case of a lightning strike, near incident event or a dead short. 
 33v power supply  01101 33v Power Supply Upgrade: For control cable lengths over 200 feet;  This can be an upgrade on new purchases and a standalone purchase for existing antennas.  For cable runs over 300 feet we recommend the Remote Driver Board (see controller information page).  The remote driver board allows you to run cat5e cable up to 2000 feet away from the tower base (power required at tower for this option)
 BigIR Mark IV Retrofit Kit 09610  BigIR Mark III to BigIR Mark IV retrofit kit for existing owners of the Mark III (without 80m coil): Includes saddles, reinforcing plate and all applicable hardware to retrofit an existing BigIR Mark III vertical to the BigIR Mark IV upgrade for high wind and high snow/ice load regions. Note: This retrofit kit does not upgrade the EHU housing.
 BigIR Mark IV retrofit for Mark III w 80m coil 09612  Same as above 09610 Mark IV retrofit kit but for BigIR Mark III owners that have the 80m coil option installed.

 

 

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