DX Engineering DXE-3RIGKEYLINE Instructions manual

DX Engineering

Key Line Combiner

DXE-3RIGKEYLINE

DXE-3RIGKEYLINE-INS Revision 0a

© DX Engineering 2021

1200 Southeast Ave - Tallmadge, OH 44278 USA

Phone: [phone] ∙ Tech Support and International: [phone]

Fax: [phone] ∙ E-mail: [e-mail]

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Introduction

The DX Engineering Key Line Combiner – DXE-3RIGKEYLINE can take the ground-on-transmit
amplifier keying lines from up to three transceivers or other devices and connect them to one
amplifier or accessory. It handles the PTT keying from three radios to one amplifier.

This device is handy when using Amateur Radio devices that need to “share” a T/R keying line and
don’t have a keying line pass-through. Each keying input or output is guarded with a separate 45V 2A
Schottky diode, providing ground-on-transmit isolation between each accessory keying line. The unit
keeps the load or voltage of any one piece of equipment from affecting the others. The voltage and
current handling depends upon the rating of the transceiver(s) transistor or relay amplifier keying
circuit. Check your transceiver’s manual for the total voltage and current that it will safely
handle. This devices handle keying lines only. Other connections and appropriate amplifier and
accessory operation must be considered. All four connectors are female RCA phono.

Features

 Works with most transceivers using ground-on-transmit keying
 Allow multiple transceivers or other gear to send the transmit key line to one amplifier
 Center Positive Keying
 Schottky diode protection between outputs
 Common RCA Phono connections
 Unit is passive - does not require power to operate

Manual Updates and Information

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.

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The PTT OUT1 is connected to the amplifier’s KEY LINE connection. The DXE-
3RIGKEYLINE depends upon the voltage and current rating of your transceiver's transistor or
relay amplifier keying circuit, so refer to your transceiver manual for the total that it will safely
handle. Most accessory keying lines float at +13.8 Vdc at only a few milliamps during operation
when sinked to ground, so this combination typically works without issue.

The PTT INPUT(s) are connected to the transceiver’s amplifier keying line connection, labeled as
‘SEND,’ ‘Relay’ or ‘TX GND.’ For some transceivers, a special DIN, mini-DIN or other connector
cable assembly may be required.

All connections use standard RCA phono connectors.

Typical Wiring Diagram

NOTE: ‘KEY LINE’ in the above diagram is also known as:

for Acom ‘KEY IN,’ or for Ameritron ‘Relay’ and ‘PTT’.

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Technical Support

If you have questions about this product, or if you experience difficulties during the installation,
contact DX Engineering at [phone]. You can also e-mail us at:

[e-mail]

For best service, please take a few minutes to review this manual before you call.

Warranty

All products manufactured by DX Engineering are warranted to be free from defects in material and workmanship for a

period of one (1) year from date of shipment. DX Engineering’s sole obligation under these warranties shall be to issue

credit, repair or replace any item or part thereof which is proved to be other than as warranted; no allowance shall be
made for any labor charges of Buyer for replacement of parts, adjustment or repairs, or any other work, unless such

charges are authorized in advance by DX Engineering. If DX Engineering’s products are claimed to be defective in

material or workmanship, DX Engineering shall, upon prompt notice thereof, issue shipping instructions for return to
DX Engineering (transportation-charges prepaid by Buyer). Every such claim for breach of these warranties shall be
deemed to be waived by Buyer unless made in writing. The above warranties shall not extend to any products or parts
thereof which have been subjected to any misuse or neglect, damaged by accident, rendered defective by reason of
improper installation, damaged from severe weather including floods, or abnormal environmental conditions such as
prolonged exposure to corrosives or power surges, or by the performance of repairs or alterations outside of our plant,
and shall not apply to any goods or parts thereof furnished by Buyer or acquired from others at Buyer’s specifications.

In addition, DX Engineering’s warranties do not extend to other equipment and parts manufactured by others except to

the extent of the original manufacturer’s warranty to DX Engineering. The obligations under the foregoing warranties

are limited to the precise terms thereof. These warranties provide exclusive remedies, expressly in lieu of all other
remedies including claims for special or consequential damages. SELLER NEITHER MAKES NOR ASSUMES ANY
OTHER WARRANTY WHATSOEVER, WHETHER EXPRESS, STATUTORY, OR IMPLIED, INCLUDING
WARRANTIES OF MERCHANTABILITY AND FITNESS, AND NO PERSON IS AUTHORIZED TO ASSUME
FOR DX ENGINEERING ANY OBLIGATION OR LIABILITY NOT STRICTLY IN ACCORDANCE WITH THE
FOREGOING.

©DX Engineering 2021

DX Engineering®, DXE®, DX Engineering, Inc.®, Hot Rodz®, Maxi-Core®, DX Engineering THUNDERBOLT®,
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Specifications subject to change without notice.