DX Engineering DXE-RR2X8B Instructions manual

2 x 8 Remote Antenna Switch

DXE-RR2X8B

DXE-RR2X8B-INS Revision 0d

© DX Engineering 2020

1200 Southeast Ave. - Tallmadge, OH 44278

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Introduction

When selecting the various switch positions, the Main has precedence. This means if the Main selects

output port #3, the Secondary cannot use port #3 at the same time.

Secondary will then be transmitting to an open

Another example would be if the Secondary has selected port 5 and you are transmitting, and the Main

then selects port 5, the Main takes port 5 and Secondary will then be transmitting into an open.

The DXE-RR2X8B is a dual 8-port switch designed to switch coaxial lines in low to medium­power RF systems typically used in a Single Operator - Two Radio (SO2R) environment.

The DXE-RR2X8B allows the user to switch inputs from either Main or Secondary radio to two of
the eight output ports using 1 of 8 logic inputs. The logic high required for switching is +12 Vdc at
100 mA. A switching time of less than 15 ms is normal.

The DXE-RR2X8B is intended to be interfaced with a customer supplied logical switching unit.
The logical switching unit used should provide for protection against hot switching and to prevent
attempts at the Main or Secondary from selecting the same output port at the same time. The DXE-

RR2X8B contains no internal logic or T/R switch sensing for transmit protection.

Features

Enclosed relays provide exceptional performance and are moisture resistant. The RR2X8B can be
used to simultaneously select multiple output ports as well as conventional one-of-eight antenna
switching. This allows the RR2X8B to be used in complex antenna systems as well as traditional
switching arrangements. Ports that are not selected are grounded.

The RR2X8B also uses removable screw terminals for the control cables. The removable plugs
greatly simplify installation by eliminating the need for soldering. Disassembly is not required for
control wiring access.

The RR2X8B also offers the following features:

 RF Shielded Weatherproof Housing - unique protection
 Excellent Port-to-Port Isolation; greater than 70 dB at 30 MHz, worst case.
 Ports not selected are grounded
 High-RF tolerant UHF connectors
 Enclosed 16-ampere RF relays
 Safe 12-volt relay operation
 16 MOVs for surge protection on control lines
 16 RF bypass capacitors
 Includes one DXE-SSVC-2P Stainless Steel V-Clamp for mounting

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Specifications

Power Rating: 6 kW ICAS all modes, under 2:1 SWR, 4 kW CCS all modes, under 2:1 SWR
Control Voltage: +10-14 Vdc at 100 mA per port
Port-to-Port Isolation: >70 dB below 30 MHz, >60 dB below 60 MHz

Ports Not Selected: Are Grounded
Loss: <0.3 dBm below at 52 MHz
Impedance: 50 ohms
Dimensions: 10.375" x 9.875" x 4.375" and the mounting flange hangs down 2.25"
Control Line: Dual 8-wire line larger than #24 for runs up to 500 ft. (or 9-conductor for

dedicated ground). When using 8-conductor wire the feedline serves as a ground return. Use
of two DXE-CW9 CAT-5 or standard low voltage control wiring, such as telephone wire, is
acceptable.

General Information

The DXE-RR2X8B uses a dual star arrangement of 24 relays to select one or more of eight output
ports when voltage is applied from two 8-wire control lines.

The 24 relays provide greatly improved power handling, port-to-port isolation and SWR over
conventional switches and allow connection between any of the eight antenna output ports from
either the Main or Secondary input ports.

The system offers virtually no loss at HF and excellent low-loss performance (less than 0.16 dB loss
on six meters).

Installation

1. Secure the RR2X8B switching unit using the included DXE­SSVC-2P stainless steel V-Saddle Clamp. For outdoor
installations or in moist environments, connectors must face
downward. Use Jet-Lube SS-30, Never-Seez® or Anti-Seize on
all stainless steel hardware to prevent galling.

2. Fasten all cables to the mounting mast or tower to relieve strain,
and gently droop the cables to form a drip loop (do not use tight
bends with coaxial cable). Install the RR2X8B with the
connectors facing down and use gradual bends or loops in heavy
wires. If the RR2X8B is mounted to a wooden pole or building,
a wide copper flashing or heavy wire or strap should be
connected from the mounting bracket to a good ground.

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