C4FM Digital Voice Repeater

440 Standalone Yaesu
The 443.350 standalone repeater has been upgrade to the Yaesu System Fusion, supporting both C4FM and analog voice transmissions. We welcome you to try it out! If you hear strange tones on the repeater, transmitting with FM voice will change the output to FM for the duration of the QSO.

WB3DZO Linked FM Repeater System

This wide-area repeater is located in Baltimore, Maryland, WB3DZO/R is a very popular FM repeater system. WB3DZO/R is the host frequency of nets on most days of the week. Maintained by the BRATS, WB3DZO/R has been in operation since the mid 1970’s and has been recently upgraded with a new software-based controller. Located on a single transmit site and multiple receive sites in Baltimore, the repeater supports emergency service and rag-chewing. Frequencies: 147.030+, 224.960-, and 448.325-. Please program a tone of 156.7 in if using 147.030+; we have been using a tone at only a single site for testing.

WB3DZO Portable Repeaters

The BRATS maintain both 2m and 70cm portable repeaters on the TMARC-authorized Shared, Nonprotected Pairs. These repeaters are used for special events on 145.170+ and 442.900+.

WB3DZO Data Repeater

The WB3DZO Data Repeater is a network of 802.11n sector antennas using 5 MHz channels on the 5 GHz amateur allocation. Using a Ubiquiti NB5g25 dish mounted on a house’s roof, coverage should be possible in these areas:
House coverage

Channels are 5 MHz, and are on 5870, 5890, and 5910 MHz. Contact us for help with alignment!

Clubs wishing to link in to the BRATS backbone can contact us as well – we’ll evaluate the best way to link up.

W3WCQ/R ATV Repeater

Located in Baltimore, Maryland, W3WCQ/R is one of the first ATV repeaters in the United States. Maintained by the BRATS, W3WCQ/R has been in operation since the mid 1970’s. Located entirely at a single site in Northeast Baltimore, the repeater operates on 439.25 MHz output and 911.250 output with 426.25 MHz input and 1253.250 input. ATV Quick Start (written quite some time ago) provides a historical introduction to Amateur Television (ATV). Look for ATV Quick Start II (coming soon) for a current synopsis of Amateur Television in the area.  If you don’t see activity on the ATV repeater, give a call on the FM repeater system (147.03+, etc.) to announce your interests. Weeknights around 9:00 pm. and during FM nets are particularly popular for video activity.

Current activity is implementing a second, on-frequency input using the popular DVB-T format of digital video.  NTSC input continues. The repeater output in the 70cm. band is now DVB-T digital only.  Inexpensive DVB set-top boxes for receiving are prevalent on eBay.  The set-top boxes can be self-programmed or request a programming image file by sending a request to .

System enhancements include computer-controlled source selection and remote configuration via the Internet.  Discussions and effort are underway toward part-time linking with other Mid-Atlantic ATV repeaters.

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