The W6CO system

October 2017  (updated March 2019):  due to the October 2017 wildfires, the Mt. Veeder equipment is all out of service.  This includes the 441.800 and 147.180 analog as well as the 440.050 Dstar systems. 

The owners and Trustee of the W6BYS repeater system have generously offered us the use of  their system.  These repeaters (both shift down) are currently operated in two locations:

1: Sugarloaf (east of Napa State Hospital) on 146.82, PL 100.0

2: Mt. St. Helena (north end of Napa Valley) also on 146.82, PL 151.4.

NOTE:  Although you may HEAR both, they may not hear you.  If you are not being repeated using one PL, then try the other.

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Please disregard all of the information below: it is no longer valid, but is left here for historical interest.

Additional sites to be added in the future.

Also available on Mt. St. Helena is the W6CO repeater on 441.900, shift up, PL 151.4.  This repeater covers Napa Valley and a good part of Sonoma County.

The W6CO repeater system is made up of 5 repeaters located at two sites in the Napa Valley.  All the repeaters in the system are open for use by any licensed operators.  Their primary purpose is to support Emergency Communications.

Mount St Helena

  • 147.180 (STH) This repeater is located on the South Peak of Mt St Helena at 4,143 feet (asl) and uses a PL tone of 151.4, positive shift .6 mHz.. The primary coverage area is the Napa Valley and Lake County.  Secondary coverage includes Eastern Sonoma County from Santa Rosa North to Cloverdale.
  • 441.900 This repeater is also located on the South Peak of Mt St Helena and uses a PL tone of 151.4, positive shift 5.0 mHz. . Stand-alone coverage is the Northern part of the Napa Valley.

Mount Veeder

  • 147.180 (VDR) This repeater is located on the Eastern flank of Mt Veeder near the Napa/Sonoma County line and uses a PL tone of 91.5 Hz, positive shift .6 mHz.. The primary coverage area is the central and southern portions of the Napa Valley.
  • 441.800 The transmitter and one receiver is located on the Eastern flank of Mt Veeder near the Napa/Sonoma County line and uses a PL tone of 151.4, positive shift 5.0 mHz..  Additional receivers in a voter configuration are located on the Valley floor to enhance use by mobiles and handheld radios.  This system is also equipped with a remote base to permit access into several nearby repeaters which are not part of our system.  See below for details.  The primary coverage area (unlinked) is the Central and Southern part of the Napa Valley with secondary coverage into parts of the Sacramento Valley (Fairfield/Rio Vista), and Southern Solano County (Vallejo).  This repeater is also equipped with an Echolink node.  See below for additional details
  • 440.050 , positive shift 5.0 mHz..This is a digital system, (D-Star module-B) also located on Mt. Veeder. This repeater can only be accessed by using D-Star compatible equipment. See Icom America’s website for more information.


If you currently have D-Star equipment, or are contemplating buying it, you will need to register before you can use some administrative features of this or any other D-Star repeater.  You should register with the gateway nearest your home address.

Registration is free, quick and easy and once you are registered you can use any D-Star gateway.  To register send an email to the repeater trustee, W6BIS.
(w6bis at att dot net)
Be sure to include your full name, address, current amateur call sign, and email address.  Please note: It is important that users register with only one gateway! If you are not sure of your registration status, check status here.

A complete  directory of D-Star repeaters can be found at

The W6CO Dstar system uses Dplus software.  We are often linked to one of the popular reflectors for extended coverage.  The Western Reflector, REF014 provides nearly seamless coverage from Reno/Sparks to the northern Sacramento Valley to Bakersfield.  Linking functions are available to all registered users.

Nailed-up Links

To enhance coverage the 441.800 repeater is normally linked full time to the 147.18 repeater located on Mt. Veeder.  It is also linked to the 441.900 repeater on Mt St Helena.  This is necessary because the UHF transmitters are equipped with directional antennas to mitigate interference to PAVEPAWS in the Sacramento Valley.

This architecture permits continuous coverage from all the Valley communities.  The link connections can be reconfigured using DTMF codes for special operations.  To manually configure the system, see the code matrix below:

The Remote Base

The Remote Base is located on the Valley floor at the 441.800 control point.  Users can operate the RB to link to several nearby VHF repeaters.  All functions use DTMF via the 441.800 repeater. (Locations in BOLD are linked)

Mt Veeder 441.800 pl 151.4 Mt Veeder 147.180 pl 91.5 St Helena147.180 pl 151.4 St Helena 441.900 pl 151.4 Remote BaseOff

Code 433 – This is the normal configuration.  Use this configuration for Wednesday night nets.  The W6BYS repeater, 146.82 PL 100 is also linked during Wednesday nets.

Mt Veeder 441.800 pl 151.4 Mt Veeder147.180 pl 91.5 St Helena147.180 pl 151.4 St Helena441.900 pl 151.4 Remote Base St Helena VHF

Code 432 – Mt St Helena VHF repeater linked via the remote base for Monday Night Nets. (Santa Rosa coverage)

Mt Veeder 441.800 pl 151.4 Mt Veeder 147.180 pl 91.5 St Helena147.180 pl 151.4 St Helena441.900 pl 151.4 Remote Base Vallejo – K6LI

The DTMF codes listed below will link the W6CO 441.800 repeater to the indicated Repeater or Simplex Channel.

Note: 433 Returns system to the normal state:
(441.800, 147.180 Mt.Veeder and 441.900 Mt.St>Helena linked together) 

If you put up a link, please restore to normal when you are finished by dialing 433, Thank you.


73 and enjoy our system.