DB42 MonstIR Pro Yagi Antenna

The DB42 Monstir Pro is currently the largest of the Dream Beam series of  Yagi antennas, with 5 elements on 20m-6m and 3 elements on 40/30. For those who aspire to the pinnacle of performance, the DB42 provides coverage from 80m through 6m (with optional 80m dipole kit). The DB42 has a 49 ft looped driven element.  This patented design allows us to make the end loop elements only 39 feet long, yet the performance is as if all 3 of the loop elements are 49 feet long.  The folded dipole loop technology lets the footprint be 40% less than that of a full size yagi,  losing only 0.4dB in gain performance.

The DB42 has a optional 80M dipole that works with the SDA100 controller for effortless tuning throughout the entire 80M band.  The dipole runs parallel to the boom and uses the end elements as capacity hats, creating zero interaction with the rest of the antenna.

The 6m passive element option for the DB42 adds 3x fixed elements to the antenna, for a total of 8 elements on 6m.  With no interaction or wind load added to the antenna, this option creates a 6m Yagi with 14.0 dBi of gain and 25 dB of front to rear!

 

 

 

Specification	DB42	DB42 with 80m Dipole Option
Boom Length	42.5 feet / 13.0 m	same
Boom	1.75 to 3 inch/4.45-7.6 cm (tapered)	same
Longest Element	49 feet / 14.9 m	same
Turning Radius	29 feet / 8.8 m	same
Weight	238 Lb / 108 Kg	242 Lb / 109 Kg
Wind Load	19.9 ft^2/ 1.85 sq. m	same
Wind rating	100 mph	same
Adjustable elements	5	same
Power Rating	3 KW continuous	80m – 1.5KW; otherwise 3KW
Feed points	3	same
Frequency coverage	6.8 – 54 MHz	3.5 – 54 MHz
Tuning Rate	1.3 ft/sec	same
Control Cable	25 conductor 22 gauge	25 conductor 22 gauge

 

Performance for Ham Bands	DB42 Forward Dir Gain DBi	DB42 Forward Dir Front to Rear, DB	DB42 Reverse Dir Gain DBi	DB42 Reverse Dir Front to Rear, DB
80M (option)	1.7	n/a	1.7	NA
40M	8.0	25.5	8.0	23.2
30M	9.0	12.4	9.0	12.3
20M	10.1	22.0	10.0	23.2
17M	10.8	22.2	10.7	21.9
15M	11.0	25.7	10.6	20.0
12M	11.9	24.1	10.4	8.9
10M	12.2	20.0	10.5	11.7
6M – 4 elements	5.0	2	5	2.0
6M – with optional passive element 50.0 – 53.3 MHz	14.0	25	NA	NA

     

 

 

Image (click for  detail)	Part Number	Description
	00442	DB36 40m-6m:  DB42 Yagi antenna, includes 2x 39 ft loop elements, 1x 49 ft element, 2x 36 ft straight element, 42 ft boom, 238 lb, 6.9Mhz – 54Mhz continuous frequency coverage; Includes basic SDA100 electronic controller, connector junction box and Astron LS3 power supply with cable.  Optional 80m dipole available.
	09128	SDA100 Controller: Standard for all antenna models; Basic controller includes: 180 degree mode, bi-directional mode, auto-retract, manual band change, manual adjustment of elements.
	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.
	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.
	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.
	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.
	01811	OPTIONAL 80m Dipole kit: This option adds a wire dipole that runs parallel to the boom, using the end loop elements for capacity hats.  Performance is only 0.8dB down in gain from a full sized 80m dipole and there is zero interaction with antenna and no wind load added.
	01603	OPTIONAL Element truss kit, end elements: Element trusses for loop element.  Because the loop elements droop lower than the non-loop elements, this option allows a more uniform appearance of all the elements. Does not improve wind or ice load limits. For appearance only.  There are two sets of trusses for this kit.
stock photo	03624	Control Cable: 24 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.
	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.
	06116	OPTIONAL Voltage Suppressor: Line filter (16 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. NOTE:   you will also need the 06108 8 wire line filter in conjunction with this 16 wire line filter for a total of 24 wires.
stock photo	01502	Connector Junction Box: Standard on the DB42 Yagi, the connector junction box is a hinged enclosure that has female terminal headers mounted inside.  The control cable and EHU cables are then connected to a male terminal plug, creating a pluggable/unpluggable connection for the antenna wiring.  The connector junction box also includes a 25 pin female dsub mounted inside, for testing the antenna at the point of installation.