FREQUENCY vs WAVELENGTH
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There are different ways to indicate where to find a certain station on 
a radio dial. For example, we could say that a station is operating on 
9680 kilohertz (kHz), 9.68 megahertz (MHz), or on 31 meters. And all 
three ways would be correct!
Radio waves are transmitted as a series of cycles, one after the other. 
The hertz (abbreviated Hz) is equal to one cycle per second. You may 
have noticed that the electric power supplied to your home is rated at 
60 Hz. Electric power is distributed as alternating current (AC), 
meaning it goes through a cycle of changing directions of flow. When we 
say that electric power is "60 Hz," we mean it changes its direction of 
flow 60 times in one second.
Radio waves go through far more cycles in a second than electric 
current, and we need to use bigger units to measure them. One is the 
kilohertz (kHz), which is equal to 1000 cycles per second. Another 
common one is the megahertz (MHz), which is equal to 1,000,000 cycles 
per second----or 1000 kHz. The relationship between these units is like 
this:

1,000,000 Hertz = 1000 kilohertz = 1 megahertz

Radio is usually thought of "beginning" at frequencies of approximately 
5 kHz, although most available receivers can only tune down to about 150 
kHz.
The term "wavelength" is left over from the early days of radio. Back 
then, frequencies were measured in terms of the distance between the 
peaks of two consecutive cycles of a radio wave instead of the number of 
cycles per second. Even though radio waves are invisible, there is a 
measurable distance between the cycles of electromagnetic fields making 
up a radio wave. The distance between the peaks of two consecutive 
cycles is measured in meters. The relationship between a radio signal's 
frequency and its wavelength can be found by the following formula:

wavelength = 300 / frequency in MHz

According to this formula, a frequency of 9680 kHz would be equivalent 
to a wavelength of 30.99 meters, which we would round to 31 meters. 
Thus, 9680 kHz, 9.68 MHz, and 31 meters all refer to the same operating 
frequency!
As the formula indicates, the wavelength of a radio signal decreases as 
its frequency increases. This is important because the length or height 
of various types of antennas must often be a fraction (usually 
one-quarter or one-half) of the wavelength of the signal to be 
transmitted or received. This means that most antennas designed for 
frequencies near 4000 kHz will be physically much larger than antennas 
designed for frequencies near 30 MHz.
Frequencies are seldom given in terms of wavelength anymore. However, 
certain segments of the shortwave bands are referred to in terms of 
"meter bands" as a convenient form of shorthand. For example, the term 
"10-meter band" is used to refer to the ham radio band that extends from 
28000 to 29700 kHz. The following is a table of the most common ham 
radio and shortwave broadcasting "meter bands" found on frequencies 
below 30 MHz:

Meter Band		Frequency Range and Use
160 meters		1800-2000 kHz ham radio
120meters		2300-2498 kHz broadcasting
90 meters 		3200 to 3400 kHz broadcasting
80 meters 		3500 to 4000 kHz ham radio
60 meters		4750 to 4995 kHz broadcasting
49 meters		5950 to 6250 kHz broadcasting
41 meters		7100 to 7300 kHz broadcasting
40 meters		7000 to 7300 kHz ham radio
31 meters		9500 to 9900 kHz broadcasting
30 meters		10100 to 10150 kHz ham radio
25 meters		11650 to 11975 kHz broadcasting
22 meters		13600 to 13800 kHz broadcasting
20 meters		14000 to 14350 kHz ham radio
19 meters		15100 to 15600 kHz broadcasting
17 meters		18068 to 18168 kHz ham radio
16 meters		17550 to 17900 kHz broadcasting
15 meters		21000 to 21450 kHz ham radio
13 meters		21450 to 21850 kHz broadcasting
12 meters		24890 to 24990 ham radio
11 meters		25670 to 26100 kHz broadcasting
10 meters		28000 to 29700 kHz ham radio

You'll notice some inconsistencies in the table above. For example, the 
17-meter ham radio band is actually higher in frequency than the 
16-meter broadcasting band. These inconsistencies have come about from 
years of use (misuse?) of a particular "meter band" to refer to a 
certain range of frequencies.

This information from      dxing.com      check it out.

sent as alert mail 2
12-02-98