HOME   New Product   Find a Dealer   Warranty      CONTACT US
About Me
  + Antenna Analyzer
  + Dummy Load
  + Frequency Counter
  + Repeater Cable
  + Repeater Controller
  + Spectrum Analyzer
  + V.S.W.R. METER
  + Walkie-talkie
  + Parts
  + EARPIECE for Zello
  + Temperature Measurement



  All Products »  Repeater Controller »  SR-328 Duplex Repeater Controller
SR-328 Duplex Repeater Controller                                         SR-328 Duplex Repeater Controller
Item Code: SR-328
Product Name: SR-328 Duplex Repeater Controller
Ask a question about this


Radio Range Extender,The SR-328 is a multi-function and cheaper device that connects any handheld or mobile radio.
By equipment and so on our assemble the build, the new generation trunk-line board, the internal structure design are finer, the outward appearance is more attractive. Besides can provide a  the basic repeater function which has following the receiver transmitter, furthermore has the Simple connection, provides the more ideal 2-way radio conversation region for you, causes you maintains the relation in the bigger operating region.

This  is a radio duplex repeater controller. It is an easy of operation and  cost effective and highly flexible platform for setting up bi-direction  band duplex repeater with mobile radio and handheld radio.  .

The SR-328 has 2 audio ports input and out , they are used to connect with mobile and handheld radio. DTMF remote control function with password protection is available in the . User can control the repeater ON or OFF remotely by DTMF. Multi-LED display 2 of radio status , and  build-in battery Level.

Feature & Specification

-Works with most popular handheld radios
-Multi- LED display 2 radio status , And controller Battery Level 
-Real time duplex repeater with link radio 
-Allows user to change the DTMF remote control password by radio  
-Operates on both build-in Li-ion battery 72 hours long life operation
-External DC 5~24V power supply 
-DTMF remote control repeater function ON and OFF with password protection
-Professional manufacturer low power consumption .


Connector Radio unit:


 Build in 3.7V Li-ion Battery:


 Ext.DC Jack 5.5/2.1mm:

 Standby Time:   180hours
 Standby Current:   4mA
Work Current: 20-30mA


Operating temperature: -10°C to +50°C
Charge  Red                          Charge
 Blue                        Full
Power /TX Status  Red flash                      Power on / standby
  Blue                        Radio A RX  >  B TX
 blue flash       Sleep mode
Battery Life  4 of  Yellow LED  100%
 3 of Yellow LED 80%
 2 of Yellow LED 50%
 1 of Yellow LED 40%
Flash  of  Yellow LED 10-30%

















How to connector Radio :   
A Input  for Radio Received               B Input  for Radio Transmit  

1, The frequency difference between the upper and lower row forwards (and conventional repeater), A machine as a signal uplink receiver, B machine as a signal downlink transmitter. In order to achieve the purpose of the relay.


When the radio units are connected, the received signal on a radio unit will be real time transmit on the other radio unit.  , 

sr-328_35.jpg (600×600)

Example 1 . Without duplexer and filter
Not have a duplexer : two hand-held units connected to a relay station, such as unparalleled workers, two hand sets should be separately using two antennas! Two antennas should be perpendicular to erect! And try to pull the distance between the two! At least not less than 1-5 metre (suggest : the farther the better two distance are Two antenna  .)
 Radio relay stations in different frequency duplex mode, that is, after receiving the weak signal of a specific frequency emitted far, immediately after synchronization will amplify and transmit the signal power to use another frequency. Who had set up a relay station people are aware, if not diplexers, height and level with two receiving antennas erected distance does not separate, not meet the technical requirements, the relay station is either not working due to self-excited work, or is "call far." This is because the weak signal relay station forwards the signal power at the time, it would be forwarded "drown" the adjacent repeater receiver front-end is a strong signal "closed."

sr-328_12.jpg (600×787)

Example 2 . With duplexer
purchase the corresponding frequency / power duplexer using "the joint " of the two hand sets connected to the antenna output terminal of the duplexer transmitter and receiver, respectively, set the frequency corresponding to the handheld units (frequency should be consistent with the duplexer). Under diplexer case, the relay station as long as the need to connect an antenna! And no special attention when erecting antennas ! 

SR-328_15.jpg (600×395)
sr-328_11.jpg (600×330)

         e.g 1. This SR-328  connects Radio and Duplexer

Example 3 . With Filter
This SR-328  connects Radio and Filter










46-GM for Motorla GM300 46-K for Kenwood 46-K for Motorla GM300 46-MU 46-MT for Motorla Talkabout
46-S for ICOM 46-S2 for Midland 46-Y for Yaesu 46-Y7 US Plug USB Wall Charger
AUS Plug USB Wall Charger UK Plug USB Wall Charger AC USB PSU US Plug AC USB PSU EURO Plug USB Power Cable
Protected Battery TR14500 800MAH        


Package Contain

  • 1 x SR328 Duplex Repeater Controller
  • 1 x 100-240V power supply unit
  • 2 x YAESU VX-3R FT-60R Radio connect cable

Related Resources






This website is compatible with Internet Explorer 11 (IE11) version of the browser, if you're using Internet Explorer, please update to IE11

Copyright © 2021 SURECOM RADIO Equipment  Powered by: Eachshell Counter 249228  Online: