Grays Harbor County, WA
145.390 -600kHz 118.8Hz
Cosmopolis VHF Repeater
During April, 2014, the Cosi
repeater will be undergoing
a major refit, during which
the station may be off-air
Thank you for your patience
Location: Overlooking Cosmopolis, WA, from near the crest of Cosmopolis
Hill, on Highway 101, about 2 miles north of the Hwy 107, "Montesano
Coverage: The "Cosi" Repeater covers the
Aberdeen/Hoquiam area of Grays Harbor County from Ocean Shores on
the west, to Elma on the east. In addition, the coverage follows Highway 101
south to the Pacific County border.
One constraint on this site is the landlord's requirement
that the entire station be mounted to the back wall and not stick
out more than a foot. Doyle, N7UJK, installed and painted a sheet of chip-board
as a foundation, and all components were secured to this. The
Wacom 5-inch BpBr duplexer
sticks out 11-inches, and the rest of the gear is well within our
one-foot allowance. Since we installed the repeater, the tiny shack has
filled up with other equipment. We are lucky to have this site, and
living within the one-foot space requirement is a modest concession.
During an emergency, this repeater will probably be disconnected
from the network, to provide intra-county communications support.
The link is capable of connecting the Cosi repeater
to the Neilton, Minot or Olympia sites, to enhance
communications within Grays Harbor County. This repeater is directly
accessible from the Grays Harbor EOC in Montesano.
Hardware: The repeater is based on
a 100-watt GE Mastr-II mobile chassis,
duplex-converted and running 40-watts output. The controller is a
CAT-200B in a Radio Shack metal box with basic controls mounted
on one side. A local speaker provides test audio when desired. The link
is provided by a GE Rangr UHF mobile, running 10-watts.
A pair of fans circulates air across
the power supply and repeater heatsinks to keep things cool. The Hustler
G6-270 antenna, shared between the repeater and link radio,
is mounted above a microwave dish well up the tower, and
fed with 150-feet of LDF5-50 7/8-inch hardline through a
diplexer. The repeater signal passes through a VHF DCI filter
to attenuate the high level of broadcast RF at this site.
Web Cam: for a look at the road
conditions on Hwy 101, right outside the
gate to the site access road,
Click Here for the WSDOT traffic cam.