WM4B FM Repeaters - 146.670/443.150 MHz - Warner Robins, GA

The repeaters are located at the Houston Medical Center in Warner Robins, GA. 146.670 went on-the-air on 22 August 2011. 443.150 went live on 9 December 2011. Both repeaters require an 82.5 Hz PL Tone for access. They consist of a modified Motorola MSR-2000 for 2-meters, a highly modified Motorola UHF MICOR Mobile for 440 MHz, and a Motorola MAXTRAC for the link to the Peach State Intertie. The transmitters produce 50 watts on 2-meters and 440 MHz and 15 watts for the link. The repeater antenna is a Diamond X510HDN mounted on the roof of the Houston Medical Center. The controller is an ARCOM RC-210. The 146.670 and 443.150 repeaters are linked full-time. The system automatically links to the the Peach State Intertie for various nets. The repeaters transmit an 82.5 Hz tone whenever a signal is present on the repeater input. Setting your radio for PL Decode will allow you to enjoy the repeater without hear various tones and announcements.

If you wish to use the repeater for a special event, please email the Repeater Manager in advance. This will help prevent conflicts between events or with scheduled maintenance outages.

The WM4B repeater is now connected to the AllStarLink network via HamVoip. Please visit my AllStarLink page for details!

Live audio feed of the WM4B repeater system is available on Broadcastify.com.

Click HERE to listen.


The system is made possible through the generous support of the Houston Medical Center. The purpose of this system is to provide repeater coverage to the local area as well as access to the Peach State Intertie in the event of an extended power outage. Everyone is invited and encouraged to utilize this system.

To ensure compliance with FCC Regulations and to help establish an environment that is conducive to effective communications and Good Amateur Practice, a set of guidelines have been established. Users should become familiar with these guidelines and operate accordingly.

DTMF Functions Available to All Users

Time of Day: 400#
Signal Report Test: 725* then unkey. Controller will respond 'READY'. Transmit test message.
DTMF Keypad Test: 475 & enter your DTMF tones without unkeying


The system automatically links Port 1 (146.670 MHz) to the Peach State Intertie on Monday at 1955 and Tuesday at 1855. The link remains active until 2200, when the system automatically disconnects the link.

Whenever Port 1 (146.670 MHz) is linked to the Peach State Intertie, Port 2 (443.150 MHz) is disabled. The link between Port 1 and Port 2 is reestablished when the link to the Peach State Intertie is disconnected.

Users may utilize the linking commands below to configure the system as desired. When finished with the links, please reestablish the link between Port 1 and Port 2 using the *121 command.

Repeater Linking Commands

Function Command Note
Link Port 1 to Port 2: *121 2 M Linked to 70 CM - Normal Operating Mode
Unlink Port 1 from Port 2: *120 All Ports Unlinked
Link Port 1 to Port 3: *131 2 M Linked to Intertie
Unlink Port 1 from Port 3: *130 Unlinks Intertie and Relinks 2 M to 70 CM

Don't have a DTMF Microphone and need to change the link-state?

Click the links above and place your microphone near your computer speakers!

Echolink Commands

Function Command Note
Disable Echolink Node #*350 EL Node Responds "Echolink Disabled"
Enable Echolink Node #*351 EL Node Responds "Echolink Enabled"

To avoid interference to other repeaters on the Peach State Intertie, the HMC repeaters do not retransmit user DTMF tones. If you need to pass tones to another repeater, simply precede your DTMF string with an '#'.

Courtesy Tone Behavior

All Ports Unlinked Port 1 Port 2 Port 3
User On This Port Hears: E-800 E-1200 N/A
Ports 1 & 2 Linked Port 1 Port 2 Port 3
User On This Port Hears: I-800 I-1200 N/A
User on this port hears this when other user is on other port: U-800 V-1200 N/A
Port 1 & Port 3 Linked Port 1 Port 2 Port 3
User on this port hears: P-800 N/A N/A
User on this port hears this when other user is on the link: L-800 N/A N/A

NOTE: In the table above, the letter signifies the CW character used for the Courtesy Tone and the number indicates the frequency of the tone.

Email the Repeater Manager

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