Please note items in red are under construction or otherwise off the air.

Mount Bullion

Mount Bullion is located a few miles out of Mariposa.  All repeaters and remote bases are controlled by one of the two RLC-DSP404 controllers.  All repeaters and remote bases can be linked to any other equipment on Mt. Bullion.

147.03 MHz + (100Hz)
224.96 – (156.7Hz)
420 Hub
444.7 MHz + (94.8Hz)
1284.3 – (88.6Hz)

Remote Bases:
29.6 MHz FM
52.525 MHz FM

Remote Receivers

These receivers act as cross band repeaters between 147.63 MHz and 449.7 MHz.  All of these receivers are bi-directional meaning you can transmit into them on either 2 Meters or 440 except for Turlock.  Both UHF and VHF PLs are the same for all of the receivers.

Turlock: 103.5 Hz
Los Banos: 107.2 Hz
Atwater: 114.8 Hz
Fresno: 118.8 Hz


In Turlock TARC has a VHF repeater, remote receiver, as well as a 2 Meter/440 remote base.  Under normal circumstances the Turlock system is configured as a remote receiver.  When it is configured this way it is only mono-directional, 2 Meters input only.  The Turlock system can also be configured so that the remote base is being repeated through the UHF/VHF repeater on Mount Bullion.  The frequency of the repeater/remote receiver is as follows:

Turlock: 147.03 MHz + (103.5Hz)


TARC has two repeaters in Yosemite National Park.  Both repeaters are normally linked to the rest of the system via the 420 hub, but if necessary can be unlinked at anytime.  Both repeaters have excellent coverage in and around the park.

Turtleback Dome: 147.000 MHz + (100Hz)
Sentinel Dome: 444.925 MHz + (94.8Hz)

Buck Rock

TARC has a UHF repeater in Sequoia National Forest on Buck Rock near Kings Canyon National Park.  The repeater is normally linked to the rest of the system via the 420 link but can be unlinked at any time.

Buck Rock: 440.30 MHz + (94.8Hz)


W6BXN has four DMR repeaters. All four repeaters are tied to the brandmeister network on both time slots.

Mount Bullion UHF: TX: 444.7875 – RX: 449.7875 – CC: 1
Mount Bullion VHF: TX: 144.9375 – RX: 147.4375 – CC: 1
Mount Oso: TX: 440.1875 – RX: 445.1875 – CC: 1
Turlock Low Level: TX: 444.350 – RX: 449.350 – CC: 2 – Network Down

Static Talkgroups:

All TARC DMR repeaters have the following static talkgroups.

Timeslot 1:
California: 3106

Timeslot 2:
Local: 2
NorCal: 31068

Broad Band Microwave

Amateur Radio Emergency Data Network (AREDN) (MESH Network)

W6BXN is operating a 5 GHz, 90° Sector Microwave Antenna on Mt. Bullion.
Coverage area should be North of Turlock along highway 99 down to South of Merced.
SSID: AREDN, Ch.179 (5.895), 10 MHz wide.

2/02/2017, W6BXN is testing a 5 GHz 90° Sector Microwave Antenna on Mt. Oso.
Coverage area should be South of Modesto to Turlock along highway 165 down to Los Banos.

SSID: AREDN, Ch.174 (5.870 GHz), 10 MHz Wide

W6BXN is also Testing a 5 GHz Nanobridge Dish that is on Mt.Oso pointed in the direction of the city of Turlock.

SSID: AREDN, Ch.183 (5.915 GHz), 10 MHz Wide

Solar-Terrestrial Data

Solar Activity

Solar X-Rays:

Geomagnetic Field: