I've also seen on the BCB that a very short distance can seem to make a
considerable difference. Sometimes one station in France is relatively good
here in Maryland, the others very poor. Or London on 1215 is relatively good,
but Bordeaux on 1206 is poor.
There also seem to be (at least) two distinct modes of propagation, as it's not
unusual to find that the upper part of the BCB (above about 1000 kHz) is good,
while the lower portion is poor, or vice-versa. The frequencies around the
mid-point tend to be the most consistent, perhaps because they can benefit from
either mode. So I would be surprised to learn that there is strong correlation
between the lower end of the BCB and 160.
--Art Delibert KB3FJO
> From: zr@jeremy.mv.com
> To: n7df@yahoo.com; topband@contesting.com
> Date: Sat, 26 Feb 2011 10:34:42 -0500
> Subject: Re: Topband: Sudden Ionospheric Disturbances
>
> Ive been running comparisons between European BCB down in the 200KHz region,
> some NDB's, Experimenters band at 500KHz, AM BCB, and 160M for many years.
> The 500KHz section only for a few years.
>
> While there has been some correlation there is often just the opposite and
> with enough ambiguity thrown in to completely confuse the issue. Others
> living further South and West might find a completely different set of
> results. Ive noticed many times over the decades how as little as 25 miles
> can affect 160 when disturbances are involved since there is a lot of 160
> activity in New England and after awhile you know who can do what.
>
> Carl
> KM1H
>
>
> ----- Original Message -----
> From: "N7DF" <n7df@yahoo.com>
> To: "160 reflector" <topband@contesting.com>
> Sent: Friday, February 25, 2011 6:03 PM
> Subject: Topband: Sudden Ionospheric Disturbances
>
>
> The following website has some interesting information that may help us to
> figure out what goes on in topband propagation
> It seems to be reasonable to expect that VLF conditions relate to MF
> conditions
>
> http://www.karlovsky.info/sid/temphtml.htm
>
>
>
>
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK
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