|The Marlborough East repeater site houses the 29.68 and 53.81 transmitters, and is the temporary home for the 449.575 repeater. It is also the former site of the 146.61 repeater, which is now located in Mendon, MA.
The 29.68 repeater operates split site, with its receiver at the MMRA Weston
Site, and the transmitter here at Marlborough East. For more information about
the receiver, see our page on Weston.
The 29.68 transmitter is a GE MASTR II base station. The base station includes a UHF receiver, and 100W power amplifier. The receiver picks up the incoming UHF link frequency (from the Weston site) and hands it to the 10m transmitter. The repeater shares a SCOM 7K repeater controller with the 6m transmitter
The repeater was installed over several days in July, 2009.
This repeater was installed and has been operating nearly continuously since October, 1996.
The 53.81 repeater operates split site, with its receiver at the MMRA Marlborough West Site, and the transmitter here at Marlborough East. For more information about the receiver, see our page on Marlborough West.
The upper photo is the 53.81 GE MASTR II base station, including a
UHF receiver, a Uniden UHF link radio, a Mastr II 6m exciter, and the older 4CX250-based
300W power amplifier which was retired from service in January 2010. It was replaced
with the Larcan amplifier shown at the top of the lower photo. Below the Larcan is a
meter panel, and at the bottom the 50V, 40A power supply for the amplifier.
The original construction of the repeater project took place during the summer months of 1996. Bryan modified the tube power amplifier by removing a turn on the plate coil and changing the topology of the grid circuit. Additionally, the PA low pass filter section's doorknob-type capacitors needed to be changed. The Larcan work began in October 2009 and was installed on January 30, 2010.
The MMRA 449.575 repeater was first located on "Mt. Nebo" in
Westborough. This is the small group towers & antennas located in
between the northbound and southbound sides of I-495, just North of the
route 9 intersection.|
The repeater was then moved to Maxtor facility in Shrewsbury, where it remained for many years. When this facility closed, it was moved to a location on a 400' tower off of route 9 in Southborough.
On May 5, 2015 the repeater was relocated once again to the Marlborough East site.
The former Southborough location tower.
|The repeater consists of an Icom RP-2100 unit and an SCOM 7K controller. It also features short term battery backup capability.|