[Antennas] 80 m vs. 75 m

[DW Holtman]

Hello,

Thanks to everyone for some great answers. Good stuff.

Best,
Wayne
----- Original Message ----- 
From: "David Kelley" <dkelley at bucknell.edu>
To: <antennas at mailman.qth.net>
Sent: Wednesday, April 23, 2008 11:42 AM
Subject: [Antennas] 80 m vs. 75 m


> By way of further explanation, you might recall that the formula for 
> wavelength in free space is lambda = c/f, where c is the speed of light in 
> free space (3 x 10^8 m/s) and f is frequency in Hz.  If you do the 
> calculation for 3.75 MHz (the top of the old CW sub-band in the US), you 
> get 80 m.  For 4 MHz (the top of the SSB sub-band in the US), you get 75 
> m.  The use of the 80 m and 75 m designations is really just a way of 
> differentiating the CW and SSB sub-bands.  In the US, 80 m = CW and 75 m = 
> SSB.
>
> 73,
> Dave NB4J
>
>
> At 01:19 PM 4/23/2008, you wrote:
>>Hi Wayne,
>>
>>80m refers (informally) to the lower half of the 3.5 - 4.0 MHz band (3.5 -
>>3.75 MHz). 75m refers, also informally, to the upper half (3.75 - 4.0 
>>MHz).
>>The two designations are often used interchangeably in Region 2; the band 
>>is
>>not officially segmented in this way.
>>
>>The Region 1 allocation is 3.5 - 3.8 MHz, so European hams refer to this
>>band as 80m, but not as 75m.
>>
>>Cheers for now, 73,
>>Adam VA7OJ/AB4OJ
>>
>>
>>-----Original Message-----
>>From: antennas-bounces at mailman.qth.net
>>[mailto:antennas-bounces at mailman.qth.net] On Behalf Of DW Holtman
>>Sent: 23-Apr-08 06:35
>>To: Mark; Antenna Mailing List :>
>>Subject: Re: [Antennas] Eighty Meter mobile or portable
>>
>>Hello,
>>
>>I hope this simple question doesn't start another war.
>>
>>What is the difference between 75 and 80 meters on the ham bands. Is there 
>>a
>>difference? They are frequently interchanged. Are the ham bands broke up
>>into two segments?
>>
>>Best,
>>Wayne
>
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