W5AC Repeaters

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W5AC Repeater Information

W5AC is proud to host several pieces of repeater equipment on campus.

146.820 MHz VHF Repeater

443.050 MHz UHF Repeater

AllStarLink Nodes 49381 and 49382

Echolink Node W5AC-R

Brandmeister DMR Talkgroup 3167972

APRS Digipeater/iGate

146.820 MHz VHF Repeater
"The 82"

Our 2-meter repeater, the 82, operates on 146.82 MHz with a negative offset and an 88.5 Hz PL tone. 

The repeater transmits on a frequency of 146.82 MHz, and listens on 146.62 MHz. 

The repeater requires a subaudible tone of 88.5 Hz on receive. The repeater also usually encodes a tone of 88.5 Hz. The only times the repeater does not encode this output tone are during certain nets (the SSTV net, for example) or when we're having intermod problems. 

The repeater radio is a TKR-751, with a Henry 110 watt PA, 6 cavity Phelps Dodge duplexers and a 30 amp GE Mastr II power supply. The controller is an SCOM 7330, shared with the 050 and AllStar node 49381. It is located on the 14th floor of the O&M Building, on TAMU Main Campus. The antenna is a Radio Frequency Systems 220-Series Super Stationmaster omnidirectional fiberglass antenna, on the roof platform next to the radar dish. This gives a height above ground around 160 feet. The repeater radio puts out 110 watts and has about a 40 mile range with a 50-watt mobile or about 5-7 miles with an HT and a "rubber duck" antenna. There is currently no emergency power capability. The repeater is "open" for use by any licensed amateur radio operator.

443.050 MHz UHF Repeater
"The 050"

Our 70-centimeter repeater, the 050, operates on 443.050 MHz with a positive offset and an 88.5 Hz PL tone. 

The repeater transmits on a frequency of 443.050 MHz, and listens on 448.050 MHz. 

The repeater requires a subaudible tone of 88.5 Hz on receive. The repeater also usually encodes a tone of 88.5 Hz. The only times the repeater does not encode this output tone are during certain nets (the SSTV net, for example).

The repeater radio is a TKR-850, with a Motorola MSF-5000 110 watt PA, 4 cavity Decibel Products duplexers and a 30 amp GE Mastr II power supply. The controller is an SCOM 7330 shared with the 82 and AllStar node 49381. It is located on the 14th floor of the O&M Building, on TAMU Main Campus. The antenna is a Diamond omnidirectional fiberglass antenna, on the lower roof (13th floor). This gives a height above ground around 130 feet. The repeater radio puts out 110 watts and has about a 25 mile range with a 50-watt mobile or about 5-7 miles with an HT and a "rubber duck" antenna. There is currently no emergency power capability. The repeater is "open" for use by any licensed amateur radio operator.

Audio Processing on the 82 and the 050

Audio for the VHF and UHF machines both have audio processing being performed by a Biamp AudiaFLEX configurable digital signal processor. The processor is currently programmed to perform some basic equalization and compression, along with echo cancellation on the receive audio of both machines. 

This project is currently in it's infancy, with minimal features and programming so far. However, initial reports of the audio quality are positive.

In the future we plan on modifying the programming, taming the audio from our AllStar node, and ensuring that the transmitters will never over-deviate. This will require us to build some new cables and rewire a few things between the controller, the repeaters, and the audio processor.

The SCOM 7330 controller

The current controller is an S-COM 7330 three port repeater controller manufactured by S-COM LLC. This controller has three ports which can each be programmed to function doing just about anything, a full-duplex repeater, a full-duplex link radio, a simplex link radio, a remote base, or a connection to IP linking hardware like AllStarLink. 

We currently use the controller to manage the various repeater states, net modes, announcements, and linking/unlinking of the repeaters and links. 

While the controller has an extensive built-in speech library, we had some custom recordings made for us by an A&M Meteorology former student

By default, the controller has the VHF and UHF machines linked together and connected to AllStarLink. We can change these links 'on the fly' as we need.

AllStarLink Nodes 49381 and 49382

In addition to our VHF and UHF repeaters, the club hosts two AllStarLink nodes. 

Node 49381 is hosted on the 14th floor of the O&M Building, on TAMU Main Campus. This node is directly connected to the SCOM 7330, and is able to be linked to the 82 and the 050. This node allows us to link to other AllStar nodes and repeaters. However, this node is behind the University firewall. As such it is only able to link out, users are not able to link in. In addition to it's linking duties, this node also hosts a variety of scripts for various purposes like automatically announcing watches and warnings from the National Weather Service, allowing stations to dial DTMF and get the current weather conditions, and providing our Broadcastify feed of the node. To view the current status of the node, or see where it's linked, click here

Node 49382 is our 'hub' node hosted in the cloud. As we control all aspects of this node, other stations should be able to link in to this node and join us. In addition, this node also hosts the connection to our Echolink node, W5AC-R and our Brandmeister DMR Talkgroup, TG3167972. To view the current status of the node, or see where it's linked, click here.

If you would like to link to the W5AC repeaters via AllStarLink, please connect to node 49382. If you intend to link for long periods of time, or would like to automatically connect and disconnect, please email the club officers before doing so.

Echolink Nodes W5AC-R and W5AC-L

In addition to our AllStar nodes, the club hosts two Echolink nodes, W5AC-R and W5AC-L. They've been used by club members who've wanted to talk to other members in the greater Bryan / College Station coverage area while they're away. Recently, we've had a few folks from other countries joining us for contacts and fun! Feel free to drop in and say hi, we love hearing new voices on the air. 

If you are connecting as an end-user (not a conference, callsign does not end with "-L", "-R") connect to node W5AC-R (244666). 

If you are a conference, link, or repeater, and attempt to connect to this node, the connection will fail. Connect instead to W5AC-L.

If you are connecting as a conference node, "-R" repeater node, or "-L" link node, connect to node W5AC-L (427439).

If you are an end-user and attempt to connect to this node, the connection will fail. Connect instead to W5AC-R. While we enjoy and welcome connections to our repeaters, if you intend to link for long periods of time, or would like to automatically connect and disconnect, please email the club officers before doing so. 

Brandmeister Talkgroup 3167972

In addition to our AllStar and Echolink connections, the club also maintains a link to the Brandmeister DMR network. If you're near a Brandmeister repeater or you've got a DMR hotspot, you can join the conversation. Set your radio for talkgroup 3167972 and you'll be on the air in Aggieland! If you'd like to see the DMR traffic live or take a listen, take a look at the Brandmeister Hoseline.

This article was updated on November 9, 2020