Northern California Digital Channels 
April 2007

50 MHz

50.60-50.80 (20 kHz channels, non-specific at this time)
51.12 SCA backbone
51.14 BBS
51.16 Keyboard to Keyboard
51.18 Experimental
51.62 TCP/IP 9600 baud
51.64-51.68 (20 kHz channels, non-specific at this time)

NOTES:

On this band, adjacent channel interference is harder to overcome for repeaters. NARCC requests that any new six meter permanent packet installations (such as nodes) please check with their six meter coordinator. You don't need to get a formal coordination, but they would like to be aware of your station and have an opportunity to check for possible conflicts first.

 

144 MHz

144.31 BBS
144.33 Balloon & experimental
144.35 Keyboard to keyboard
144.37 BBS LAN forwarding
144.39 APRS (U.S. and Canada)
144.41 Duplex, lower half (145.61 upper half, 1.2 MHz split)
144.43 TCP/IP (OK to run duplex with 145.65)
144.91 Keyboard to Keyboard (and EOC)
144.93 BBS
144.95 DX Spotting
144.97 BBS
144.99 BBS
145.01 User Access
145.03 Keyboard to Keyboard
145.05 Keyboard to Keyboard
145.07 BBS
145.09 BBS
145.61 Duplex, upper half (144.41 lower half)
145.63 BBS
145.65 TCP/IP 9600 bps (OK to run duplex with 144.43)
145.67 DX Spotting
145.69 BBS
145.71 9600 bps
145.73 BBS
145.75 TCP/IP
145.77 DX Spotting
146.58 DX Spotting

NOTES:

Allocations from 144.31 through 144.43 are relatively close to the weak signal sub-band--watch your deviation.

145.610 / 144.410 D-Star digital voice repeater, K6MDD Mt. Diablo



220 MHz

219.05-219.95 100 kHz channels, Backbone
223.54 LAN
223.56 LAN
223.58 LAN
223.60 LAN, SACVAL (Sacramento Valley)
223.62 LAN, SBAY (South Bay)
223.64 TCP/IP
223.66 Keyboard to Keyboard
223.68 DX Spotting Backbone
223.70 LAN, MRYBAY (Monterey Bay)
223.72 LAN, NBAY (North Bay)
223.74 DX Spotting Backbone

NOTES:

219-220 channels are by coordination only. There are currently political/legal problems with using 219-220, making them unavailable in most of northern CA. Contact the NCPA (Gary Mitchell, wb6yru@aenet.net) for details.

223.58 is also TCP/IP interlink in Sacramento is secondary, not to interfere with BBS LAN.

 

440 MHz

431.45 / 434.85 Duplex pair (100 kHz)
431.55 / 434.95 Duplex pair (100 kHz)
431.65 / 438.40 Duplex pair (100 kHz)
431.85 / 438.60 Duplex pair (100 kHz)
431.95 / 438.70 Duplex pair (100 kHz)
433.05 TCP/IP Backbone (100 kHz)
433.15 BBS Backbone (100 kHz)
433.25 DX Spotting Backbone (100 kHz)
433.33 Experimental (60 kHz)
433.37 BBS, 9600 baud
433.39 DX Spotting
433.41 BBS LAN
433.43 TCP/IP 9600 baud
433.45 BBS LAN
433.47 Keyboard Interlink
433.49 TCP/IP
433.51 Keyboard to Keyboard
433.53 Keyboard to Keyboard (and EOC)
433.55 BBS LAN
441.50 Any digital

 

900 MHz

903.500 1 MHz wide, TCP/IP
904.500 1 MHz wide, TCP/IP
915.500 1 MHz wide, Experimental
916.100 200 kHz Wide, Experimental
916.300 200 kHz Wide, Experimental
916.500 200 kHz Wide, Experimental
916.650 100 kHz Wide, Experimental
916.750 100 kHz Wide, Experimental
916.810 20 kHz Wide, Experimental
916.830 20 kHz Wide, Experimental
916.850 20 kHz Wide, Experimental
916.870 20 kHz Wide, Experimental
916.890 20 kHz Wide, Experimental
916.910 20 kHz Wide, Experimental
916.930 20 kHz Wide, Experimental
916.950 20 kHz Wide, Experimental
916.970 20 kHz Wide, Experimental
916.990 20 kHz Wide, LAN interlink (Contra Costa County only)

NOTES:

900 MHz activity is on a non-interference basis to vehicle locator service. 900 MHz is not considered suitable for omindirectional systems and is recommended for point-to-point links only.

 

1296 MHz

1248.500 1 MHz wide, Experimental*
1249.000-1249.450 Unchannelized, Experimental
1249.075 simplex D-Star data, K6MDD Mt. Diablo
1249.500 100 kHz wide, Experimental
1249.600 100 kHz wide, Experimental
1249.700 100 kHz wide, Experimental*
1249.800 100 kHz wide, Experimental*
1249.870 20 kHz wide, Experimental
1249.890 20 kHz wide, DX Spotting
1249.910 20 kHz wide, Experimental*
1249.930 20 kHz wide, Experimental*
1249.950 20 kHz wide, Experimental*
1249.970 20 kHz wide, Experimental*
1249.990 20 kHz wide, Experimental*
1250.500 1 MHz wide, Experimental
1251.500 1 MHz wide, Experimental
1297.000-1298.000 Unchannelized, Experimental
1298.500 1 MHz wide, Experimental*
1299.000-1299.450 Unchannelized, Experimental
1299.500 100 kHz wide, Experimental
1299.600 100 kHz wide, Experimental
1299.700 100 kHz wide, Experimental*
1299.800 100 kHz wide, Experimental*
1299.870 20 kHz wide, BBS LAN
1299.890 20 kHz wide, DX Spotting
1299.910 20 kHz wide, BBS LAN
1299.930 20 kHz wide, Experimental*
1299.950 20 kHz wide, Experimental*
1299.970 20 kHz wide, Experimental*
1299.990 20 kHz wide, Experimental*

NOTES:

* Full duplex channel pairs at 50 MHz separation, (example: 1249.910 ‹—› 1299.910)

Definitions

9600 bps Stations using 9600 bps with direct FSK (G3RUH, TAPR, etc.) modems.

Backbone No uncoordinated stations. These channels are for specific purposes as defined by the NCPA and affiliated groups. This is where the various BBS's, nodes, and networks forward traffic and are very high volume channels. Please use the normal user entry points of the network you want to access rather than these channels.

BBS These frequencies are for user access to a full-service BBS. Keyboard-to-keyboard is tolerated. Please don't put high level digipeaters or nodes on these channels since they are local. A low-level direct link or node that links into a backbone on another frequency is the proper implementation.

Duplex Simultaneous transmit and receive by a single station, including digital repeaters. Duplex channels are intended for high-volume applications. 9600 baud or higher is encouraged, but not required at this time.

DX Spotting Northern California DX Packet Spotting Network (DXPSN). No other activity should be on these channels.

EOC Emergency Operations Center Any group participating in or set up for emergency communications in support of appropriate government agencies.

Experimental Anything goes except full service BBS or any 24 Hr/Day services (nodes, gateways, etc). This is where you can come and test new gear, programs, etc. These channels may be reassigned in the near future, so no permanent activities please.

Forwarding see "backbone"

Keyboard to Keyboard Primarily chat channels. These are also the primary emergency channels, including EOC usage. No continuous high-volume activity such as full service BBS, DX Spotting, and TCP/IP servers.

Interlink see "backbone"

LAN Local Area Network. BBS's are grouped in LAN's for more efficient forwarding. A LAN frequency is the forwarding channel within the LAN and to the backbone. Please do not attempt to access the BBS network on these channels unless you are coordinated with PSNC.

Personal Mailbox/Maildrop A BBS-like system, often running entirely within a TNC, with a small number of users that handles information of a personal, local or special-purpose nature. A Mailbox is allowed on keyboard-to-keyboard channels only if it does not forward with other BBS's (personal or otherwise). Mailboxes may forward with full-service BBS's on BBS channels at the discression of the BBS SYSOP.

TCP/IP Stations using TCP/IP protocol on top of AX.25. Regular AX.25 is tolerated to communicate to TCP/IP stations if a compatible p-persistance access method is used.

User Access User access to a network. This is for the next generation of packet which is expected to operate like the internet. Users would access such a network on these frequencies. The load on these channels may be rather high, like BBS channels. The activity may be like a combination of BBS, keyboard, TCP/IP, or other modes.

Procedure for changes

Send requests for changes to either the frequency coordinator or the NCPA board remailer.The frequency coordinator will then present the requests to the board along with suggested assignments. The NCPA, a representative committee, makes all digital assignments.

Misc. Info.

Except for the 219-220 segment, the NCPA currently does not coordinate individual stations, nodes, etc. leaving that to the special interest groups. BBS station coordination is done by the PSNC in Northern CA. DX Spotting is coordinated by DXPSN. Some digital is coordinated on auxiliary channels by NARCC.

The NCPA board conducts most of its meeting activity electronically by internet e-mail remailer.  As with face-to-face board meetings, interested persons are welcome. Subscribe to the remailer by sending e-mail to ncpa-request@kkn.net with "subscribe ncpa" as the message (without the quotes), the subject doesn't matter. Subscribing to the remailer is like attending a continuous NCPA board meeting.

NCPA board internet remailer: ncpa@kkn.net (one needs to subscribe first)

NCPA president & freq. coord.: Gary Mitchell, WB6YRU, wb6yru@aenet.net, packet: WB6YRU@N0ARY.#NCA.CA.USA.NOAM

 

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