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Maxon Radio by Topaz3

SR-6151V / SR-6451U
SR-6151DV / SR-6451DU

Maxon SR-6100 series
Repeaters & Base Stations

Maxon SR-6151 and SR-6451 Repeaters and Base Stations
Sorry-This Radio is No Longer Available - Parts & Accessories  continue to be OK.

Includes: 2 SM-6000 Mobile radios, 10 Amp power supply, Repeater Housing, Cables, UHF to BNC adaptors, Cooling Fan and programming

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***Channel Programmed FREE***

$ Qty
UHF 450-480 MHz
Maxon SR-6451DU
35 Watt   1 Channel
12.5/25 KHz Ch Spacing
Includes: Duplexer/Programming

$ Qty
VHF 148-160 MHz
Maxon SR-6151DV
35 Watt   1 Channel
12.5/25 KHz Ch Spacing
Includes: Duplexer/Programming

$ Qty
UHF 450-480 MHz
Maxon SR-6451U
40 Watt   1 Channel
12.5/25 KHz Ch Spacing
Includes: Programming

$ Qty
VHF 148-174 MHz
Maxon SR-6151V
40 Watt   1 Channel
12.5/25 KHz Ch Spacing
Includes: Programming

Check Out the SM-6000 Mobile Radio
around which the SR-6000 Repeater is built
Maxon Enduro SM-6000

Extended Communication
Maxon's SR-6000 Series VHF and UHF repeaters provide an extended range of communications from your portable and mobile radios. These repeater / base station models feature the Maxon Enduro SM-6000 Series mobiles, and provide you with dependable operation in construction sites, farm / ranch settings, warehouses, factories, transportation facilities or other large, multi-building environments.


  • 40 Watts Transmit power:
    Punch-through power for optimum range from any location. Note: Power output is 35 watts when using the factory tuned 6-cavity duplexer included with the D version.
  • 148-174 VHF SR-6151V
    148-160 VHF SR-6151DV

    450-480 UHF SR-6451(D)U
  • 1 CTCSS or 1 DCS User Group:
    This allows an unlimited number of portables or mobiles programmed to match these parameters the ability to share this repeater. Regenerated CTCSS and DCS including cross tone encoding available.
  • 100% Duty Cycle:
    Dedicated for full time heavy use applications. Built-in cooling fan ventilation keeps repeater up and running 24/7/365.
  • Squelch Tail Elimination:
    Reverse Burst and DCS turnoff code for quiet "tailless" operation. Reduces user ear fatigue in busy operations.
  • Built-in CW ID:
    Programmable Continuous Wave (CW) ID (International Morse Code) per FCC requirements.
  • Compact and Lightweight:
    With case dimensions of  7.25" x 8.5" x 11.75" and a convenient carry handle this repeater is perfect for rapid relocation or use with radio rental operations.

SM-6000 Radio Features:
 (2 radios used in repeater - Note: Some
  features below are not available when
   used in repeater configuration)

  • 9-Character Backlit LCD w/Icons
  • Compact Size (6-5/15" x 1-3/4" x 6")
  • Backlit function control buttons
  • Public Address mode
  • Talk-around mode
  • Time-out-timer
  • Programmable volume settings
  • Programmable home System / Group
  • 12.5/15/25/30 KHz Channel Spacing
  • 5.0/6.25/7.25 KHz Channel Stepping
  • CTCSS/DCS Encode/Decode
  • Dedicated data-only channel operation
  • Wideband Synthesized
  • Per-System Automatic Number Identification (ANI)
  • Busy System queuing
  • Meets MIL-STD 810 F, Shock, Vibration and Dust
  • Heavy Duty Die-Cast Chassis
    with polycarbonate faceplate
  • External speaker jack
  • Time-Out Timer
  • Loud 4 Watt Internal Audio Power
    10 Watt External Speaker Power
  • Direct FM Modulation
  • PC Programming via Software and Cable (optional)

Got a Question?

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 Optional Accessories - Microphones
Model # Description Price

 ACC-702  Base Station Desktop Microphone


 Optional Accessories - Speakers
Model # Description Price

 AA-1470A  10 Watt Heavy Duty Remote Speaker


 Optional Accessories - Duplexers
Model # Description Price

 675-010-0002  VHF Duplexer Mobile Type 148-160 MHz
  5 MHz separation, 70 dB isolation, 50 Watt input


 675-010-0003  UHF Duplexer Mobile Type 449-480 MHz
  5 MHz separation, 70 dB isolation, 50 Watt input


 Optional Accessories - Miscellaneous
Model # Description Price

 ACC-560  SR-6151 / SR-6451 Audio Compander Board


General Specifications      Maxon - SR-6151 / SR-6451
  VHF Band SR-6151(D)V UHF Band SR-6451(D)U
Frequency Range 148-174 MHz (148-160 MHz -D) 450-480 MHz
Channels 1 1
Channel Spacing 12.5 / 15 / 25 / 30 KHz
Channel Stepping

5.0 / 6.25 / 7.5 KHz

5.0 / 6.25  KHz

Channel Spread 26 MHz (12 MHz-D) 30 MHz
Antenna Impedance

50 Ohms

Input Voltage 13.8 VDC 20%
Current Drain

< 150 mA Standby / < 500 mA Receive / < 10A Transmit

Operating Temperature -22 F to 140F   /  -30 to +60 C
Frequency Stability

2.5 ppm  (-30 to +60 C)


7.25" x 8.5" x 11.75"


16 lbs. (with duplexer)

FCC Identifier



FCC Compliance

Parts 22, 74, 90

Parts 22, 74, 80, 90, 95

Canadian Certification No.



Duty Cycle

100 %


included with models SR-6151DV / SR-6451DU only



DCS Tones


Morse Code Station ID


Repeat Audio Processing


ANSI/EIA/TIA-603 Receiver Specifications
  VHF Band SR-6151(D)V UHF Band SR-6451(D)U
Sensitivity (12dB SINAD) 0.25 uV @ 12.5 KHz / 0.25 uV @ 25 KHz
Selectivity 62 dB @ 12.5 KHz / 72 dB @ 25 KHz
Intermodulation 72 dB @ 12.5 KHz / 72 dB @ 25 KHz
Spurious Response

75 dB

Audio Output 4W (int.) 16 Ohm    /   10W (Ext.) @ 8 Ohm     < 5% THD
ANSI/EIA/TIA-603 Transmitter Specifications
  VHF Band SR-6151(D)V UHF Band SR-6451(D)U
RF Power Output.

40 Watts (35 Watts with duplexer)

Frequency Stability 0.000025 PPM (-30 to +60C)
Modulation 11K0F3E  2.5KHz max  /  16K0F3E  5KHz max
Spurious & Harmonics -75 dB
FM Hum & Noise

36 dB @ 12.5 KHz / 42 dB @ 25 KHz

Audio Distortion Per EIA / TIA-603 Spec
  (@60% deviation) 2% @ 1 kHz
Output Impedance 50 ohms


Topaz logo covering Maxon and Legacy products
Topaz technology, today, tomorrow. The Maxon and Legacy brand products in this document portray our experience and dedication to the communications industry. With continued growth and new product offerings, we are ready to meet the challenges of tomorrow.
Your assurance of quality. We are very proud of our product quality and stand behind every product we sell with these three Quality Assurance Promises:
  • 2 Year Parts and Labor Warranty
  • 6 Month Replacement Program Quality
  • Parts Performance Guarantee


From manufacture, our radio products are certified to strict ISO 9002 quality standards by one or both of these internationally known agencies.

Note: Features and specifications subject to change without notice

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Copyright 2000-2018  Multec Communications / - All rights reserved. Do not duplicate without the express written consent of Multec Communications.
Shipping & Mail only - Note: returns require a RA# - see RETURNS  before shipping
Address...                      Note: warranty repairs only - see REPAIRS  before shipping

Multec Communications
319 Centre Ave.  #166
Rockland, MA  U.S.A.   02370-2613
781 294-4992 main
781 527-5004 fax (include return email w/fax)

Main 781 294-4992
- calling hours 2-5 EST  Monday-Friday for questions and tech support only...."Out of Area", "Restricted" and "Private Caller" calls may be blocked to avoid phone spam. Note: The main line is often very busy and voice mail is not available. Please place orders online using our secure e-commerce system. Save time...order online!

If you have questions about ordering please see  ordering information page  first. Phone orders slow processing time, increase inaccuracies and are not recommended.

Email questions or comments at - Email

Note: Not responsible for typographical, photographic or pricing errors.
         All pricing and specifications subject to change without notice.