Burlington


There are five antennas. The leftmost mast holds the UHF link antenna (corner reflector) and the UHF repeater antenna (fiberglass stick). The center two antennas belong to our host's EOC (two tribanders: one is 2m/220/440 tribander, the other is 6m/2m/440). The rightmost antenna is the 2m repeater's DB224.


The Burlington repeater is built in a Digital Equipment Corporation computer rack. You can see the UHF duplexers behind the panel at the top. next down in the 440 transmitter.

Because the controller in this system lacks the front panel display, a homebrew display panel was built which electrically is a copy of the standard 7K display board. Mechanically, the LED's were arranged in a matrix - each row contains the display for port 1, port 2, and port 3. The columns indicate receiver squelch status, tone decode status, link status, timeout status, and transmitter PTT. To the right of this are the input status lines for power failure detection, alarm, and last receiver active.

Below the display panel is the SCOM 7K controller.

Next on down, , you can see the Motorola Radius M10 440 receiver (left) and Motorola Radius 100 link transceiver (right).

Below these, you'll find the Astron power supply that runs the UHF equipment.

Finally, The Master II 2m repeater is in the brass cabinet below this, with its power supply at the bottom.

A north looking view from the roof. Broadcast station WRKO is located very nearby.
The photo to the left is of the antennas at the old Stoneham site. This MMRA repeater was originally located in Stoneham at the New England Memorial Hospital (also known as the Stoneham hospital), in the 1970's. It remained there through multiple ownership changes and even for many years after the hospital went out of business. In Spring 2008, MMRA was notified that the hospital was to be torn down. Power is to be cut at the building in 2009. Thus began the effort to find a new site.

On October 18, 2008 a crew of fifteen removed all the MMRA equipment, as well as some other ham equipment, from the Stoneham facility and reinstalled it at our new Burlington location. Downtime for the 2m repeater was less than six hours.



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