This is from an Military/Industry Newsletter
--------------------------------------------

Former Electronic Spectrum Designations (MHz)

Band  Frequencies
----  -------------
I     100 - 150
G     150 - 225
P     225 - 390
L     390 - 1550
S     1550 - 3900
C&S   3900 - 5200
C&X   5200 - 6200
X     6200 - 10900
K     10900 - 36000
Q     36000 - 46000
V     46000 - 56000


New Electronic Spectrum Designations (MHz)

Band  Frequency/Channel Number
----  ------------------------

      0     25    50    75    100   125   150   175   200   225   250
      +-----------------------------------------------------------+
A     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      250   275   300   325   350   375   400   425   450   475   500
      +-----------------------------------------------------------+
B     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      500   550   600   650   700   750   800   850   900   950   1000
      +-----------------------------------------------------------+
C     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      1000  1100  1200  1300  1400  1500  1600  1700  1800  1900  2000
      +-----------------------------------------------------------+
D     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      2000  2100  2200  2300  2400  2500  2600  2700  2800  2900  3000
      +-----------------------------------------------------------+
E     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      3000  3100  3200  3300  3400  3500  3600  3700  3800  3900  4000
      +-----------------------------------------------------------+
F     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      4000  4200  4400  4600  4800  5000  5200  5400  5600  5800  6000
      +-----------------------------------------------------------+
G     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      6000  6200  6400  6600  6800  7000  7200  7400  7600  7800  8000
      +-----------------------------------------------------------+
H     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      8000  8200  8400  8600  8800  9000  9200  9400  9600  9800  10000
      +-----------------------------------------------------------+
I     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      10000 11000 12000 13000 14000 15000 16000 17000 18000 19000 20000
      +-----------------------------------------------------------+
J     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      20000 22000 24000 26000 28000 30000 32000 34000 36000 38000 40000
      +-----------------------------------------------------------+
K     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      40000 42000 44000 46000 48000 50000 52000 54000 56000 58000 60000
      +-----------------------------------------------------------+
L     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+

      60000 64000 68000 72000 76000 80000 84000 88000 92000 96000 100000
      +-----------------------------------------------------------+
M     |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  8  |  9  | 10  |
      +-----------------------------------------------------------+


For example:

      K3 is the designator for 24,000 to 26,000 MHz.
      A6 is the designator for 125 to 150 MHz