HI Phil, Generally, the splits are either 500KHz, 1MHz or 1.5MHz, but it
depends on your location and there are some odd splits!  I will paste the
frequency chart from my old Midland commercial radio that was converted
wich are mostly Arizona and California frequencies, but my be useful!

            Midland Syn-tech
Type: Z-273

Channel,  RX-Freq.  RX-DEC.  TX-FREQ.  TX-ENC.

00  53.0  None.  53.0  None
01  52.525  100.0  52.525  100.0
02  53.72  None.  52.72  136.5
03  53.01  None.  52.01  127.3
04  53.01  None.  52.01  136.5
05  53.41  None.  52.41  110.9
06  53.19  None.  52.19  110.9
07  53.01  None.  52.01  100.0
08  53.04  None.  52.04  100.0
09  52.56  167.9  52.06  100.0
10  52.56  None.  52.56  None
11  52.06  None.  52.56  167.9
12  52.68  141.3  52.18  82.5
13  52.18  None.  52.68  141.3
14  52.56  141.3  52.06  82.5
15  51.86  100.0  51.36  100.0
16  51.36  None.  51.86  100.0
17  51.74  None.  51.24  114.8
18  51.76  None.  51.26  114.8
19  51.78  None.  51.28  114.8
20  51.80  None.  51.30  114.8
21  51.80  None.  51.30  100.0
22  51.82  None.  51.32  127.3
23  51.82  None.  51.32  141.3
24  51.84  None.  51.34  82.5
25  51.84  None.  51.34  114.8
26  51.86  141.3  51.36  82.5
27  51.88  None.  51.38  114.8
28  51.92  None.  51.42  114.8
29  51.94  141.3  51.44  82.5
30  51.94  None.  51.44  110.9
31  51.96  None.  51.46  82.5
32  51.96  None.  51.46  114.8
33  51.98  None.  51.48  82.5
34  51.98  None.  51.48  114.8
35  52.50  None.  52.0  167.9
36  52.58  None.  52.08  103.5
37  52.60  None.  52.10  82.5
38  52.80  None.  52.10  107.2
39  51.70  None.  51.20  100.0
40  52.64  None.  52.14  136.5
41  52.66  None.  52.16  82.5
42  52.66  None.  52.16  110.9
43  52.68  None.  52.18  107.2
44  52.70  None.  52.20  82.5
45  52.70  None.  52.20  156.7
46  52.72  None.  52.22  123.0
47  52.94  None.  52.44  82.5
48  52.76  None.  52.26  114.8
49  52.78  None.  52.28  82.5
50  52.80  None.  52.30  82.5
51  52.80  None.  52.30  107.2
52  52.80  None.  52.30  114.8
53  52.82  None.  52.32  103.5
54  52.86  141.3  52.36  82.5
55  52.88  None.  52.38  82.5
56  52.90  None.  52.40  82.5
57  52.90  None.  52.40  114.8
58  52.92  None.  52.42  82.5
59  52.96  None.  52.46  82.5
60  52.98  None.  52.48  82.5
61  52.98  None.  52.48  131.8
62  52.98  None.  52.48  141.3
63  53.54  None.  53.04  82.5
64  53.37  None.  51.67  100.0
65  52.93  None.  51.23  100.0
66  52.83  None.  51.13  107.2
67  52.81  None.  51.11  100.0
68  53.21  None.  52.21  None.
69  50.30  None.  50.30  None.
70  51.50  None.  51.50  None.
73  52.60  None.  52.10  156.7
74  52.98  None.  52.48  103.5
75  51.60  None.  51.60  None.
76  52.02  None.  52.02  None.
77  52.04  None.  52.04  None.
78  52.49  None.  52.49  None.
79  52.54  None.  52.54  None.

HTH and 73:
JOhn
John Jacques
Amateur Radio Station: KD8PC
"Where Cat Is,  Is Civilization!"