WA3UMY 443.05 MHz Remote Base Repeater System

The FIRST and only full-featured REMOTE BASE REPEATER SYSTEM in Southern Maryland! This privately-owned system, located in Lexington Park, is an open repeater that is available for use by any appropriately licensed amateur radio operator.

This system, in addition to providing excellent UHF coverage in the lower portion of St. Mary's and Calvert counties, also hosts remote base radio transceivers on 10 meters, 6 meters, 2 meters, 1.25 meters, and 70 centimeters. The repeater is also configured to provide access to over 1,000 other repeaters and remote bases world-wide via the Internet Radio Linking Project (IRLP). IRLP capabilities are described in more detail in a separate portion of this website.

Click on the links below for more information, view operating guides and get the operational codes needed to use the entire feature set of this repeater:

- Pictures of the WA3UMY remote base repeater system

- Remote Base operation guide [Word document, 28 KB]

- Digital Voice Recorder guide [Word document, 18 KB]

- Repeater User Access & Control Codes

Repeater specifications:

Frequency: 443.05 MHz out / 448.05 MHz in

Carrier access: no PL or sub audible tones required

Availability: 24 hours/day

Output power: 100 watts

Antenna: Celwave 1151Super-StationMaster, 8 dBd gain, 0 degree beam tilt,
85' AGL, 211' AMSL

Feed line: Andrew 1/2" Heliax

Transmitter / receiver: Spectrum Communications SCR-77 UHF repeater

High Power Amplifier: Spectrum Communications SCA-100

Controller: Advanced Computer Controls RC-850
                      - version 3.6 software
                      - computer interface option
                      - FC-900 remote base interface
                      - digital voice recorder (2 record/playback channels)

Remote bases: ICOM IC-900 Super Multi-Bander System
                               - UX-19A 10 meter transceiver
                               - UX-59A 6 meter transceiver
                               - UX-29H 2 meter transceiver
                               - UX-39A 1.25 meter transceiver
                               - UX-49A 70 centimeter transceiver

IRLP interface: Yes (see IRLP section of this website for details)

Duplexer: Celwave 526SR, 6-cavity

Power Supplies: Spectrum Communications SCP-30, 60-amps (2 each)
- one for SCA-100 amplifier (30 amps)
- one for the remote base transceivers (30 amps)

Repeater features:

- Autopatch / Emergency Autodial / User Autodial

- Reverse autopatch & computer message entry / retrieval by telephone

- Digital Voice Recorder (DVR) multi-channel solid-state voice storage
and message system (voice mail storage & retrieval via radio or telephone;
bulletin announcements of general interest; and various voice ID's)

- Remote base links on 10 meters thru 70 cm + IRLP node #4820

- Autopatch / Membership fees: None