The Williamstown Repeater “625”
146.625 -600 Khz
PL: 100Hz in/out
Status: On the Air
The repeater is located just South of Barre, VT and covers up and down the I-89 Corridor from Randolph (Exit 4) to Waterbury (Exit 10), with spots of usable coverage south of the Randolph/Bethel area. The repeater also covers the Central Vermont area, including: Montpelier, Barre, Berlin, Middlesex, Plainfield, Marshfield, Northfield, Orange, Corinth, Groton and Calais. The Williamstown Repeater is unlinked from the Vermont Interconnect System at this time.
The repeater is a Motorola Quantar running at 115 watts. The receiver is very sensitive and performs well. The system also includes a five-cavity pre-selector module, tuned to provide 45dB of adjacent channel rejection across a 4 MHz span. This amounts to a usable input sensitivity down to -123dBm. The repeater is connected to a Sinclair Technologies Q202 duplexer, which provides over 80dB of isolation. All of this is connected to 1/2″ hardline which runs to a 4-bay dipole, providing around 7 dBd of gain.
This repeater is capable of operating mixed-mode – analog FM and P25 digital. The repeater still works exactly as it used to in analog, and will automatically switch between analog and digital operation depending on which signal is received. We encourage all amateurs to try out our repeater’s new capabilities – use Network Access Code 802 for transmit and receive. We recommend our analog users set a receive squelch tone (CTCSS) of 100 Hz to prevent from hearing digital data when the repeater is in digital mode.
The current system was installed in March of 2020, replacing the Motorola MSF-5000 and Link Communications repeater controller. The MSF-5000 system was installed in August of 2018, replacing the club’s old GE Mastr II, which ran reliably for over two decades.