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Re: (meteorobs) ALL: AstroAlert: Very Large Possible Naked-Eye Sunspot Group



Well I guess that's nothing I didn't already know. i just thought 
maybe there was some other kind of DXing I was missing. Thanks.

Jeff, KA9YIH

>At 10:09 2000/09/20 -0500, you wrote:
>>Okay, I'm not afraid to show my ignorance, it's the only way to
>>learn, but what exactly dies VHF DXing refer to? I have a ham license
>>so I know what DXing is and all that but...
>
>The definition of VHF DX varies somewhat with the band.  The largest number
>are on 144 MHz; so I'll start there.  VHF DX  on 144 is generally defined
>as anything beyond the normal distance or the normal tropo scatter.  I.e.,
>tropo beyond 500 miles, MS, Es, ionospheric scatter, aurora, ducting, TE,
>EME etc.  (On a number of these, contacts shorter than about 500 miles are
>extremely difficult.  But since they don't occur every day, unless you're
>on High Speed CW Meteor Scatter, they fall into the "more unusual"
>categories).
>
>On 50 MHz, where all types of propagation are possible, the definition is
>usually the same.  But as Es is common in the spring and summer months, a
>lot of people really don't consider single-hop Es anything unusual.
>
>On 222, 432, and the higher bands, it's similar again, but some of the
>modes such as TE don't seem to exist.
>
>So the "rule of thumb" definition would probably be anything beyond 500
>miles or so on the VHF/UHF bands, or any type of propagation that either
>isn't very common (aurora, etc) or takes some extra skill and/or power to
>utilize it, even tho it's always available (MS, IOS, EME, etc).
>
>For the record, on 144 MHz, I have a little over 300 grids, all states,
>about 60 countries.  I've been pushing High Speed Meteor Scatter in this
>country for the past 2 years, and am now starting some experiments, with a
>half dozen other fellows, on ionospheric scatter, which isn't really that
>well understood.
>
>73, Shelby, W8WN
>
>Shelby Ennis, W8WN - EM77bq - KY
>                 w8wn@arrldot net
>               w8wn@amsat.org
>    Web - http://www.qsldot net/w8wn/ 
>                        <><
>
>
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