You can now help support WorldwideDX when you shop on Amazon at no additional cost to you! Simply follow this Shop on Amazon link first and a portion of any purchase is sent to WorldwideDX to help with site costs.
The Feb 2025 Radioddity Giveaway Results are In! Click Here to see who won!

Reply to thread

Message

2m, 10m, 11m, & 12m is a radio users shorthand for different frequency ranges. For example, 2m is the 144-148mhz range and is a Ham band. 11m is shorthand for 26.965mhz to 27.405mhz, the CB band. Different frequencies also for 12m & 10m - and so on.

The reason they use 'm' is for meters. Because the actual physical length of these frequencies have an approximate length, and they measure that length in meters. For example, 11m (the CB band) is the length in meters in which one single full wavelength occurs at those frequencies. A full wavelength is therefore about 36 feet +/-; or 11 meters.

A 1/4 wave antenna is ~9 feet long, a 1/2 wavelength antenna is ~18 feet long, and a 5/8 wavelength antenna is about 22.5 feet long. All fractions of a full wavelength of the 11m band.

To add some more insight here, is that when the wavelength ('2m' - example) is shorter; the frequency is higher. The 70cm Ham band is at 440mhz and is only 27.5 inches long - while at the other extreme the 160m band has a very long frequency period - but is only 1.8mhz in frequency.

Hope this helps some . . .

<blockquote data-quote="Robb" data-source="post: 440192" data-attributes="member: 8446">2m, 10m, 11m, &amp; 12m is a radio users shorthand for different frequency ranges.&nbsp; For example, 2m is the 144-148mhz range and is a Ham band.&nbsp; 11m is shorthand for 26.965mhz to 27.405mhz, the CB band.&nbsp; Different frequencies also for 12m &amp; 10m - and so on.The reason they use &#039;m&#039; is for meters.&nbsp; Because the actual physical length of these frequencies have an approximate length, and they measure that length in meters.&nbsp; For example, 11m (the CB band) is the length in meters in which one single full wavelength occurs at those frequencies.&nbsp; A full wavelength is therefore about 36 feet +/-; or 11 meters.A 1/4 wave antenna is ~9 feet long, a 1/2 wavelength antenna is ~18 feet long, and a 5/8 wavelength antenna is about 22.5 feet long.&nbsp; All fractions of a full wavelength of the 11m band.To add some more insight here, is that when the wavelength (&#039;2m&#039; - example) is shorter; the frequency is higher.&nbsp; The 70cm Ham band is at 440mhz and is only 27.5 inches long - while at the other extreme the 160m band has a very long frequency period - but is only 1.8mhz in frequency.Hope this helps some . . .</blockquote>

[QUOTE="Robb, post: 440192, member: 8446"] 2m, 10m, 11m, & 12m is a radio users shorthand for different frequency ranges. For example, 2m is the 144-148mhz range and is a Ham band. 11m is shorthand for 26.965mhz to 27.405mhz, the CB band. Different frequencies also for 12m & 10m - and so on. The reason they use 'm' is for meters. Because the actual physical length of these frequencies have an approximate length, and they measure that length in meters. For example, 11m (the CB band) is the length in meters in which one single full wavelength occurs at those frequencies. A full wavelength is therefore about 36 feet +/-; or 11 meters. A 1/4 wave antenna is ~9 feet long, a 1/2 wavelength antenna is ~18 feet long, and a 5/8 wavelength antenna is about 22.5 feet long. All fractions of a full wavelength of the 11m band. To add some more insight here, is that when the wavelength ('2m' - example) is shorter; the frequency is higher. The 70cm Ham band is at 440mhz and is only 27.5 inches long - while at the other extreme the 160m band has a very long frequency period - but is only 1.8mhz in frequency. Hope this helps some . . . [/QUOTE]

Top Bottom