The majority of the groups go through
PCI. They seem to be the primary people assigning/coordinating channels for everyone. Many people also share channels too. As far as I know very little run repeaters.
I would ask PCI. That's your best source of info.
And for what it's worth, though old.....
http://www.score-international.com/baja ... Speaks.pdf
If you want to go it alone I'd get familiar with what you can find for known Baja freqs (151-153Mhz for example). The
Race-Dezert forum is a good source also; it's one of the better desert racing forums.
ETA:
Here's an assortment of freqs. This isn't all of them either!
1) 151.625 Weatherman/SCORE
2) 151.715 BFG RELAY
3) 151.985 RHI/TG Racing I
4) 153.395 BFG PITS
5) 151.925 CHECKERS PITS
6) 150.860 FAIR PITS
7) 151.685 NETWORK
154.555 Floyd/GRIFFIN I *
9) 151.505 CHECKERS II
10) 153.185 TG Racing II
11) 153.380 MAG 7
12) 154.615 Floyd/GRIFFIN II
13) 153.215 RHI II/BFG Pvt.
14) 151.490 BITD/SCORE III
15) 150.875 SCORE II
16) 154.515 PCI RELAY
17) 151.070 DECO Steve/Derek 16
18) 150.800 Canada Hummer
19) 151.950 Henns/RHI III
20) 154.555 Floyd Hummer
21) 150.935 Marc Stein/Sykes #1
22) 150.950 Andataco/D. Sykes#2
23) 153.170 Craig Turner 7
24) 151.725 Baker 7s/Penhall 10
25) 152.330 Gary Mecham 7S
26) 151.220 Jarad/Eric Hardin 7S
27) 151.835 Joe Custer 7S
28) 153.080 Jeff Lewis #1
29) 154.550 Jeff Lewis #2
30) 147.825 Scott Sells 7
31) 153.365 Duralast/Landfield 7S
32) 151.520 Robby Gordon
33) 151.000 Bob Gordon
34) 151.040 Mark Post
35) 153.560 TEAM GREEN
36) 154.980 BAJA PITS I
37) 153.455 BAJA PITS II
38) 153.065 J. Spirkoff/Spirit
39) 151.655 I. Stewart/Mecham
40) 153.320 Ivan Stewart #1
41) 153.305 Ivan Stewart #2
42) 150.965 Trackside Photo
43) 152.780 Off-road.com
44) 151.600 Herbst #1
45) 152.045 Larry Ragland
46) 153.725 Baldwin #1
47) 153.245 Goodyear Main Pit
48) 155.970 Barstow Sheriff
49) 166.375 Barstow BLM EMER.
50) 157.620 SCORE 5
152.4200 SCORE Medical
152.2900 SCORE Broadcast