DX Engineering DXE-ARAV4-1P Manuale utente

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Active Receive Antenna

Vertical Configuration

DXE-ARAV4-1P - Single Vertical Antenna

DXE-ARAV4-2P - Two Vertical Array Package (for use with NCC-2)

DXE-ARAV4-4P - Four Vertical Array Package

DXE-ARAV4-8P - Eight Vertical Array Package

Used under US Patent No. 7,423,588

DXE-ARAV4-INS-Revision 0a

1200 Southeast Ave. - Tallmadge, OH 44278 USA

Phone: (800) 777-0703 ∙ Tech Support and International: (330) 572-3200

Fax: (330) 572-3279 ∙ E-mail: [email protected]

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Introduction

Ideal for Amateur Radio or Shortwave Listening, the DXE-ARAV4 Active Receive Antenna

systems (ARAV4) offer excellent receiving performance from 100 kHz to 30 MHz using a 3-piece

aluminum antenna element only 102 inches long. DX Engineering’s unique design makes it vastly

superior to traditional active antennas in both strong signal handling and feedline decoupling,

providing significantly better weak signal reception due to lower spurious signal interference and

reduced noise.

Location Considerations

The best place to install your active antenna is where you have the recommended space away from

power lines and away from your house, tower or any structures which are excellent sources of

noise. Even passive wiring in a building or metal fencing can act as a pickup antenna and re-radiate

noise.

The ARAV4 systems can be affected by local noise sources. Local noise can be random or

directional in nature. Every effort must be made to locate sources of noise that could be eliminated

at the source. Dimmer switches, electric timers, photocell-operated security lights, and many other

items can be sources of unwanted noise. Plasma-screen television receivers are a known generator

of unwanted noise interference. Most modern LED or LCD flat panel televisions are not broadband

noise generators.

If the noise source is external and single directional in nature, using two ARAV4 antennas in

conjunction with the DXE-NCC-2 Receive Antenna Variable Phasing Controller could allow the

user to phase out the noise being received. Large transmit antennas are a very good source of re-

radiated noise.

Ideally your receive antenna should be a minimum of 1/2-wavelength away from any transmit

antenna (on the lowest frequency) to avoid mutual coupling and the transfer of any noise being re-

radiated by the transmit antenna. If the unit is located 1/10-wavelength to 1/2-wavelength from a

transmitting antenna, the unit must be powered off at least 5 ms before transmitting on the transmit

antenna. However, with this close spacing, coupling from the nearby transmit antennas becomes

more pronounced. At much higher frequencies above 25 MHz, where the active element length

becomes a partial wavelength, coupling increases further. Placing a DXE-ARAV4 on the same mast

or tower as a Yagi or other transmitting antenna is not recommended for this reason.

When installed closer than 1/2-wavelength on the lowest frequency from a transmit antenna, to

assure highest protection for the active antenna, a DXE-TVSU-1B Time Variable Sequencer Unit

should be used to ensure the correct transmit-to-receive switching. The ARAV4 series active

vertical antenna system grounds the antenna element when power is turned off.

THIS IS A RECEIVE-ONLY SYSTEM

You should never attempt to transmit through the system.

The use of bypass relays and sequential timing is required to avoid damage to the

receiver and active antennas in the proximity of transmit antennas.

Placing any active receive system on the same mast or tower as the transmit antenna is

not recommended.

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General Information

This compact receiving antenna system operates over a very wide bandwidth with superior strong

signal performance. The output Third Order Intercept (TOI) is approximately +30 dBm. This is

significantly better than most aftermarket preamplifiers and receivers - making it one of the cleanest

active antennas on the market, reducing or eliminating spurious signals.

Feedline decoupling, absent in some other popular designs, is also exceptionally good. Decoupling

the shield greatly reduces feedline conducted noise and unwanted signal interference

The ARAV4 systems can be affected by local noise sources. Local noise can be random or

directional in nature. Every effort must be made to locate sources of noise that could be eliminated

at the source. Dimmer switches, electric timers, photocell-operated security lights, and many other

items can be sources of unwanted noise. If the noise source is directional in nature, using two

ARAV4 antennas in conjunction with the DXE-NCC-2 Receive Antenna Variable Phasing

Controller would allow the user to phase out the noise being received. Plasma-screen television

receivers are a known generator of unwanted noise interference. Most modern LED or LCD flat

panel televisions are not broadband noise generators.

Systems Packages

There are 4 Vertical Active Receive system packages. (DXE-ARAV4-1P, -2P, -4P, -8P)

DXE-ARAV4-1P

Non-conductive mounting plate

Aluminum 3-piece antenna element

AVA-2 Active matching system w/ Internal Antenna Disconnect Relay

DXE-FVI-1 - Feedline Voltage Injector − powers the matching system and provides radio

connections

Wall mounted transformer +12 Vdc (120 Vac 60 Hz to +12 Vdc @ 1A)

Stainless steel clamps and hardware

DXE-ARAV4-2P - The two active antennas system package DXE-ARAV4-2P is intended to be

used with the optional DXE-NCC-2 Noise/Phase Controller to make a steerable dual vertical array.

The NCC-2 can also provide power (internal jumper selectable) for the active antennas and the

proper transmit power-off sequencing.

(2) Non-conductive mounting plates

(2) High quality tapered aluminum antenna elements

(2) AVA-2 Active matching systems w/ Internal Antenna Disconnect Relays

(2) Element connection wires, pair, with ring and fork terminals

(2) Sets of Stainless steel clamps and hardware

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DXE-ARAV4-4P - The four active antennas system package DXE-ARAV4-4P is intended for

use with the optional DXE-RFS-SYS-2P Receive Four-Square system to build a Four-Square

Receiving Array. The RFS-SYS-2P which has provision for powering the active antennas

(4) Non-conductive mounting plates

(4) High quality tapered aluminum antenna elements

(4) AVA-2 Active matching systems w/ Internal Antenna Disconnect Relays

(4) Element connection wires, pair, with ring and fork terminals

(4) Sets of Stainless steel clamps and hardware

DXE-ARAV4-8P -The eight active antennas system package DXE-ARAV4-8P is intended for

use with the optional DXE-RCA8C-SYS-2P Receive Eight Circle system to build an Eight Circle

Receiving Array. The RCA8C which has provision for powering the active antennas

(8) Non-conductive mounting plates

(8) High quality tapered aluminum antenna elements

(8) AVA-2 Active matching systems w/ Internal Antenna Disconnect Relays

(8) Element connection wires, pair, with ring and fork terminals

(8) Sets of Stainless steel clamps and hardware

WARNING!

INSTALLATION OF ANY ANTENNA NEAR POWER LINES IS DANGEROUS

Warning:Do not locate the antenna near overhead power lines or other electric light or power

circuits, or where it can come into contact with such circuits. When installing the antenna, take

extreme care not to come into contact with such circuits, because they may cause serious injury or

death.

Manual Updates

Every effort is made to supply the latest manual revision with each product. Occasionally a manual

will be updated between the time your DX Engineering product is shipped and when you receive it.

Please check the DX Engineering web site (www.DXEngineering.com) for the latest revision

manual.

Features

Close Spacing from Transmit Antennas –Receive element is grounded at power-off

Sensitive − Weak signal sensitivity rivaling full size antennas

Wide Bandwidth –100 kHz to 30 MHz

Excellent Strong Signal Handling − Outstanding Third Order Intercept of +30 dBm

Reduced Noise − Quiet FET followers and exceptional feedline shield isolation

Long Life − High quality stainless steel mounting hardware, full metal enclosure

Compact − Three piece aluminum element has low visual and environmental impact and

ideal for portable use and easy to transport

- 5 -

Easy Mounting and Installation Flexibility − Pre-drilled mounting plate and stainless

steel U-Bolt Saddle clamps for mounting to your ground rod

May be connected to a transceiver which lacks a receive antenna input using the optional

DXE-RTR-2 Receive Antenna Interface for transceivers

Frequency response optimization included - internal jumpers

Technical Description

This compact receiving antenna system is designed to operate over a very wide bandwidth from the

broadcast band to 30 MHz with superior strong signal performance. The Third Order Intercept

(TOI) is approximately +30 dBm, reducing or eliminating spurious signals.

Exceptional feedline decoupling, absent in some other popular designs, greatly reduces feedline

conducted noise and unwanted signal interference.

The DXE-ARAV4 Active Receive system requires well filtered +10 to +15 Vdc @ 60 mA nominal

current. This power must be supplied through the feedline using the included DXE-FVI-1 Feedline

Voltage Injector and wall mounted transformer power supply (also included). Alternatively, well

filtered station power may be used with a 1 amp in-line fuse. If used, the DXE-TVSU-1B Time

Variable Sequencer Unit or DXE-NCC-2 Receive Antenna Variable Phasing Controller will supply

power for multi-element arrays. The DXE-TVSU-1B Time Variable Sequencer Unit and the DXE-

NCC-2 Noise Canceling Receive Antenna Controller will interrupt the power to the DXE-ARAV4

for proper antenna grounding during the transmit operation of the transceiver.

- 6 -

Installation

Location

The best place to install your active antenna is where you have the recommended space away from

power lines and away from your house, tower or any structures which are excellent sources of

noise. Even passive wiring in a building or metal fencing can act as a pickup antenna and re-radiate

noise.

The ARAV4 systems can be affected by local noise sources. Local noise can be random or

directional in nature. Every effort must be made to locate sources of noise that could be eliminated

at the source. Dimmer switches, electric timers, photocell-operated security lights, and many other

items can be sources of unwanted noise. Plasma-screen television receivers are a known generator

of unwanted noise interference. Most modern LED or LCD flat panel televisions are not broadband

noise generators.

NOTE: The following describes the use of the DXE-SSVC-1P and DXE-SSVC-1PG V-Clamps

that are included with the ARAV4. These are used for mounting the ARAV4 on a typical

ground rod from 1/2" OD to 3/4" OD.

If you plan to mount the ARAV4 to a larger mounting mast, you will need two optional

DXE-SSVC-150P and one optional DXE-SSVC-150PG V-Clamps which will

accommodate a mounting mast that is 1" OD to 1-1/2" OD.

Basic Tools Required

1/4”, 3/8”, 5/16", 7/16", 1/2" wrenches or nut drivers, and a 5/8" wrench

# 2 Phillips Head Screw Driver

7/64” and 3/32” Allen Wrenches - Included in this kit -

- 7 -

Low Frequency Response - Internal Jumpers

The sensitivity response of the AVA2 system does not need to be changed for almost all

installations. However, jumpers may be required to optimize or increase sensitivity or eliminate

interference from strong broadcast stations. Set the jumpers to the lowest operating frequency

desired only if high power broadcast interference is suspected. Refer to Table 1 for various

jumper settings.

For access to the jumpers, loosen the two #2 Phillips Screws on each

side of the AVA-2 unit and remove the chassis from the bottom.

The circuit board and jumper headers will be visible as shown in

Table 1.The AVA-2 has five internal jumpers that modify frequency versus gain response. The L

jumpers change the inductance values and C jumpers change the capacitance values. As shipped, all

jumpers are deactivated for full frequency coverage - 100 kHz to 30 MHz.

Frequency

MHz

Inductor Jumpers

Capacitor Jumpers

L1MF

L1HF

C1HF

C1MF

C1LF

3.10 *

■

2.90

■

2.60

■

2.40

■

2.35

■

2.15

■

2.10

■

1.98

■

1.93

■

1.85

■

1.80

■

1.65 **

■

1.40

■

1.30

■

1.15

■

Table 1 - Low Frequency Jumper

Locations and Settings

1.10

■

0.98

■

Installing jumpers in L1MF, L1HF or both, will configure the antenna for a sensitivity peak near the

frequencies listed. The frequency response above the peak frequency does not change significantly.

Below the peak frequency, sensitivity reduction is reasonably fast. Installing a jumper in any C1

position when jumpers are being used in L1 will move the peak response lower in frequency,

decreasing sensitivity at higher frequencies (this is not normally recommended).

* Broadcast Interference and 160 meter rejection setting - 80 Meter high pass.

** Broadcast Interference rejected high pass setting for 160 meters and above.

- 8 -

Assembly

The assembly described is for a single DXE-ARAV4-1P. Use JTL-12502 - Jet-Lube SS-30 on the

joints between the antenna elements and on all stainless steel hardware threads to prevent galling

and to ensure proper torque.

Orient the black mounting plate with the antenna mounting holes close to the top, as shown in

Figure 1. Mount the AVA-2 matching unit with the ANT + terminal toward the top and the F-

Connector toward the bottom. Use the 5/8" hex head bolts, flat washer under each bolt, flat and split

washer under each hex nut.

Figure 1

Loosely install the two stainless steel U-Clamps on the black mounting plate using the U-Bolt, V-

Clamp, Flat washers, Split Washers and Hex nuts as shown in Figure 2.

Figure 2

- 9 -

Antenna and Antenna Mounting Parts List

Item

Description

QTY

Item

Description

QTY

Mounting Plate

#6-32 x 3/4” Socket Head Cap Screw

1/2” Tube, Drilled

#6 Flat Washer

3/8” Tube, Drilled

#6-32 Nylon Lock Nut

1/4” Tube, Drilled

#4-40 x 1/2” Socket Head Cap Screw

#10-24 x 1-1/2” Hex Head Cap Screw

#4 Flat Washer

#10 Flat Washer

#4-40 Nylon Lock Nut

#10-24 Hex Nut

1/4” Vinyl Cap

#10-24 Nylon Lock Nut

REF

#10 Terminal with Wire (Ref. Item)

#10 External Tooth Washer

7/64” Allen Hex Wrench

5/16” Aluminum Spacer, 11/32” long

3/32” Allen Hex Wrench

NOTE: This

parts list and

drawing (Figure

3) does not

include all of the

parts that are

included in this

kit.

The parts list

(above) and

drawing (shown

to the right) only

show the parts for

the antenna and

antenna

mounting.

Other parts in this

kit include the

ARAV unit,

ARAV mounting

hardware, ground

mast mounting

clamps and

ground clamp and

are described in

the assembly of the ARAV4.

Figure 3

- 10 -

Bottom Antenna Element Assembly

Refer to the drawing shown in Figure 3 and Figure 4 for the antenna assembly.

Figure 4

Install 2 hex head bolts (#10-24 x 1-1/2” long) in the mounting plate using flat washers and hex nuts

as shown in Figure 5, tighten in place.

Figure 5

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