Zoneprop uses the SSN retrieved from
http://www.swpc.noaa.gov/ftpdir/weekly/Predict_high.txt
As you will note the value of SSN for Oct 2008 is given as predicted SSN =
10.8 and high SSN = 20.8.
The actual value of SSN used is determined by the current K index. The
current K index is retrieved once an hour and then the matrix is updated
using the K index and the SSN. An SSN value of 20.8 is used when the K
index is <= 2 and when the K index is > 2 the SSN value that is used is
10.8.
A detailed description of how the propagation engine works is given here
http://www.radiosport.ca/zoneprop/manual.php
CU in the contests.
... Sylvan
Sylvan Katz, VE5ZX
Saskatoon, SK
http://www.radiosport.ca/zoneprop/
--------------------------------------------------
From: "Rick Kiessig" <kiessig@gmail.com>
Sent: Thursday, October 16, 2008 11:58 PM
To: "'Randy Thompson K5ZD'" <k5zd@charter.net>; "'Tim Holmes'"
<w8tahradio@gmail.com>
Cc: "'CQ Contest Reflector'" <cq-contest@contesting.com>
Subject: Re: [CQ-Contest] Work Plan for CQ WW DX
> Interesting. Any idea why an SSN of 21 was (apparently) used? If the
> analysis was done with a VOACAP-based tool, the NGDC SSNs are recommended,
> and the value there for Oct 2008 is SSN = 6. Using a higher SSN would
> probably bias the results toward higher frequencies.
>
> http://www.astrosurf.com/luxorion/qsl-ssn-history-voacap.htm
> ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SUNSPOT_NUMBERS/sunspot.predict
>
> 73, Rick ZL2HAM
>
>
> -----Original Message-----
> From: cq-contest-bounces@contesting.com
> [mailto:cq-contest-bounces@contesting.com] On Behalf Of Randy Thompson
> K5ZD
> Sent: Friday, October 17, 2008 5:52 PM
> To: 'Tim Holmes'
> Cc: 'CQ Contest Reflector'
> Subject: Re: [CQ-Contest] Work Plan for CQ WW DX
>
> VE5ZX and friends have put together an interesting matrix that shows
> propagation between CQ zones.
>
> http://www.radiosport.ca/zoneprop/index.php
>
> That will give you some idea of what bands are open to where and when.
>
> Randy, K5ZD
>
>
> _______________________________________________
> CQ-Contest mailing list
> CQ-Contest@contesting.com
> http://lists.contesting.com/mailman/listinfo/cq-contest
>
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|