Stockton Lake 444.975- Repeater
The 444.975 Repeater became a part of the SMLRS system on September 25, 2013. Though not a part of the original plan, it was required to stabilize the RF link from Nevada into the SMLRS system. In addition to link stabilization, it provides a redundant “hub” repeater as it is tied to the 442.150 Crane repeater via a dedicated RF link extending the range of the SMLRS hub linking network while providing excellent HT coverage in an area known to be struck by severe weather.
An Andrew DB-420 was installed at 220′ AGL and new Andrew LDF6-50 1-1/4″ heliax was installed on the tower. Ground kits were installed at the top and the bottom of the tower to keep lightening out of the shelter.
The repeater is located inside a commercial, climate-controlled shelter. A UPS provides constant, 120vac power to the equipment and will keep the repeater online until the site generator turns on during extended power outages. The generator is capable of running for several weeks without re-fuel, making the power at the site ultra reliable.
The repeater is a commercial Motorola MSF-5000 110w continuous duty UHF repeater, and is wired up to the SCOM 7330 controller. The Motorola CDM-120 hub linking radio and controller are powered by a 40a Duracomm power supply, which loafs at current levels drawn by the link radio and SCOM equipment. The TX RX 28-66-02A duplexers connect the repeater to the antenna system via Andrew FSJ4-50B 1/2″ superflex and aPolyphaser lightening arrestor and ultimately the antenna.
A commercial Motorola CDM-1250 link radio is used to connect the 444.975 repeater to the other SMLRS system 442.150 UHF“hub” repeater at Crane. The 40w radio runs at only 18-Watts and is cooled with forced air to allow for continuous duty operation. The radio is connected to an Andrew DB-436 yagi at 100’ AGL via Andrew LDF6-50 1-1/4” heliax, which utilizes ground kits on the coax and a Polyphaser coax lightening arrestor to protect the equipment from lightening damage.