There are several systems of interconnected repeaters in western Washington and surrounding regions.  Each of these systems contains multiple receivers and transmitters, linked by RF or land line, that allows coverage area over many counties and sometimes thousands of square miles, often incorporating crossband links.

Evergreen Intertie

The Evergreen Intertie may be the best known of the local repeater networks.  It encompasses about 30 repeaters spread through Washington, Oregon, Idaho, Montana, and can link to repeater networks in southern California.  Repeater coverage is available on 2 meter, 440 MHz, and 220 MHz bands.

Links between the autonomous repeaters of the Evergreen Intertie are controlled by DTMF codes.  To make a connection to a distant city, you communicate to Repeater A using your transceiver, then command Repeater A to bring up the link to Repeater B, then command Repeater B to bring up the link to Repeater C--all using DTMF signals.

A very nicely done handout describing the Intertie's repeater nodes, frequencies, and the command codes needed to operate the links is available in PDF form by following the instructions at http://www.evergreenintertie.com/.  A map is available at http://www.qsl.net/worc/evergreen.html.  A Yahoo Group, evergreenintertie@groups.yahoo.com, seems to have the most current information, and the operating handout is available through the Yahoo Group too.

K7PP and WA7YCP (147.20)

The K7PP system of 5 repeater sites covers Puget Sound, the Olympic Peninsula, parts of Vancouver Island and the Canadian Gulf Islands, Washington Pacific Coast, and the I-5 corridor down to Portland.  Frequencies are 147.20(+), 147.28(+), and 443.4(+) MHz, with tone of 107.2, 123.0, or 127.3, depending on your location and which receiver you wish to use.  Home page is http://www.k7pp.com/ .

The SRG (Spokane Repeater Group) sponsors the WA7YCP repeater system in eastern Washington, which also uses 147.20 MHz.  A system of CTCSS codes selects which remote receiver you are using.  The codes themselves are private.  See http://www.dalek.org/srg/ to obtain them.

The K7PP and WA7YCP repeaters are linked together, thus creating a single "virtual" repeater on 147.20 with coverage of large parts of the state.  Codes to control the link are issued to contributing members of either repeater network, and the two systems honor reciprocal memberships.

Mt. Baker Amateur Radio Club (MBARC)

MBARC operates several repeaters, including a linked system sponsored by the Northwest Washington 10/6/440 Repeater Group.  Repeater information is at http://www.qsl.net/k7skw/repeater.htm .  Here is the condensed version of the linked repeater information:

MBARC runs two repeaters on 146.740(-)  The one on Mt. Constitution uses a tone of 103.5, and the one on Lookout Mountain (near Lake Samish) uses a tone of 127.3.  The Mt. Constitution 2 meter repeater is sometimes linked to a 444.050(+) repeater (103.5 tone).

AA7UJ

AA7UJ, KB7QHC, and KI7VE operate a linked group of 440 MHz, 220 MHz, 6 meter, and 10 meter repeaters around Kirkland, Washington, with two satellites.  See http://www.qsl.net/aa7uj/ for exact frequencies and tones.  As of June, 2006 the 10 meter repeater (29.620) is inoperative.

Olympia Amateur Radio Society (OARS)

OARS operates a 3-band linked repeater system on 147.360, 224.460, and 441.400 MHz (103.5 tone).  Club website is http://olyham.org/.

BeachNet Repeater System

BeachNet serves Pacific County and Grays Harbor County with a system of 13 linked 2 meter and 440 MHz repeaters.  Mountainous terrain there prevented reliable communication between field stations and the two Pacific County EOCs.  BeachNet has slowly grown and now has nearly full coverage of Pacific County and Grays Harbor County on both VHF and UHF, together with a link to the 145.37 Grass Mountain repeater, allowing VHF communication with the Washington State EOC at Camp Murray.  Coverage extends into Pierce and Lewis Counties.

Main website is http://www.qsl.net/nm7r/index.htm.  A brochure (in MS-Word format) is available with repeater frequencies and a map.  All repeaters in the BeachNet system are continuously linked; everything said on one repeater is heard on all others.  Links are transparent to users; you simply change your frequency and tone to match the geographic area you're in.

BeachNet is linked nightly (9 to 10 pm local) to the AB7F Repeater System.  It is linked to a repeater system in Astoria, Oregon Mondays at 7:00 PM and Thursdays at 7:30 for ARES Nets.  It is linked to the Capitol Peak 145.470 repeater Sunday evenings at 7:15 for the ARES District Three Net.

Vancouver Island Trunk System

The Vancouver Island Trunk System links at least 15 different repeaters from Victoria to Port Hardy, mostly in the 2 meter band.  Coverage is available over most of the east coast of Vancouver Island, and a good bit of the west coast.  Most repeaters are solar powered or have battery backup.

Full information on the system, including link codes to connect or disconnect repeaters, is at http://www.islandtrunksystem.org/  

AB7F

The AB7F repeater network is designed to cover the I-5 corridor from Chehalis, Washington to Eugene, Oregon.  The network has one 2 meter repeater, one 220 MHz repeater, and 4 440 MHz repeaters, all continuously linked.  The 444.875 repeater in Randle, Washington has been accessed from Seattle.  Coverage of the network extends to Astoria and Cascade Locks.

Home page is http://www.wa-net.com/~ab7f/.  It includes frequencies, CTCSS tones, and coverage maps.  This system is Echolink node 37987 and IRLP node 3652. 

BAGNET

N7BAG operates BAGNET, a continously linked set of 3 repeaters in the 440 MHz band centered on Portland, Oregon.  Coverage extends from Eugene, Oregon to Chehalis, Washington.  See http://www.pacifier.com/~n7bag/ for details. 

Oregon Coast Repeater Group

The Oregon Coast Repeater Group is a group of RACES members who operate a series of linked VHF and UHF repeaters along the Oregon coast, including several APRS digipeaters and weather stations.  They operate under club callsign W7GC.  Website is http://www.ocrg.org/.  A page of links to regional repeater maps is at http://www.ocrg.org/level2pages/rptr_maps.html.

Amateur Radio Relay Group (K7RPT)

Oregon has what looks to me like thoroughly saturated 2 meter and 70 centimeter coverage via ARRG.  See http://www.arrg.org/ for their site, or these links for coverage maps:

• http://www.arrg.org/saddle.html (coverage plot)
  
• http://www.arrg.org/images/map144.pdf (2 meter map)
• http://www.arrg.org/images/map440.pdf (70 centimeter map)
  

Half Ton Radio Club (N7JTA/N7LXC)

The Half Ton Radio Club operates a statewide linked repeater system, with coverage over most of Washington on 2 meters (145.570 or 146.540) and UHF (445.50 and others).  Website is http://groups.msn.com/MikeReidConstruction/n7jtan7lxclinkpage.msnw.  Be alert to a possible callsign change, as N7LXC became a Silent Key on December 27, 2007.