Get your variation, also named declination, here: http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp
73, Kjell, PB3SM - SM6CPI > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of James G. Dean > Sent: 18 October 2009 14:58 > To: 'Jim Reisert AD1C'; ON4AOI > Cc: [email protected] > Subject: Re: [Dx4win] Headings > > As a former naval navigator, I have been following this > discussion with interest. I agree with Jim that it makes most > sense to use true north. The magnetic pole shifts each year, > and the amount of shift is indicated on nautical charts as > the "Variation". Each bearing taken with a magnetic compass > must be corrected for the Variation, and while the > year-to-year change is small, it means that every time you > realign your antenna, you have to recalculate the correction. > While DX4W may permit an offset, it makes no sense to me to > use magnetic north a) because it shifts, and b) because any > program that I have found that calculates bearings and > distance always is based on the geographic north pole. > Nautical charts are always related to true north. > > It makes more sense to me to set up your antenna once to true > north using an available magnetic compass, and then to > establish a point or "datum" on the ground as the true north > alignment point for future realignments due to beam changes, > maintenance, storm damage, etc. That is what I do and it has > worked very successfully. > > For what it is worth. > > 73, > > Jim, VE3IQ > > On 18 Oct 2009 at 10:03, ON4AOI wrote: > > > Hi Jim, > > If you have your rotator controlled by dx4win its easy to setup. > > Under rotator you have the tab Parameters where you can > setup for each > > band An offset and also a correction for the selected band. > > > > Guy ON4AOI > > > > > -----Oorspronkelijk bericht----- > > > Van: [email protected] [mailto:dx4win- > > > [email protected]] Namens Jim Reisert AD1C > > > Verzonden: zaterdag 17 oktober 2009 19:27 > > > Aan: DX4WIN Reflector > > > Onderwerp: Re: [Dx4win] Headings > > > > > > DX4WIN beam headings are referenced to the geographic > North Pole - > > > 90 degrees North Latitude. There is no way for DX4WIN to > know the > > > heading to magnetic north from your particular QTH. I am > not aware > > > of ANY program that can do this. > > > > > > What DX4WIN should have, and I can't find it at the > moment, is a way > > > to program an offset into the rotator control. Then if your > > > antennas were aligned to magnetic North, DX4WIN could > compensate for > > > this. Maybe Guy ON4AOI knows if such a feature exists. > > > > > > 73 - Jim AD1C > > > > > > -- > > > Jim Reisert AD1C, <[email protected]>, http://www.ad1c.us > > > ______________________________________________________________ > > > Dx4win mailing list > > > Home: http://mailman.qth.net/mailman/listinfo/dx4win > > > Help: http://mailman.qth.net/mmfaq.htm > > > Post: mailto:[email protected] > > > > > > This list hosted by: http://www.qsl.net Please help support this > > > email list: http://www.qsl.net/donate.html > > > > ______________________________________________________________ > > Dx4win mailing list > > Home: http://mailman.qth.net/mailman/listinfo/dx4win > > Help: http://mailman.qth.net/mmfaq.htm > > Post: mailto:[email protected] > > > > This list hosted by: http://www.qsl.net Please help support > this email > > list: http://www.qsl.net/donate.html > > > > > > Jim Dean, VE3IQ > 1134 Plante Drive > Ottawa, ON, Canada, K1V 9E8 > > Tel: (613) 733-5585 > Fax: (613) 733-7613 > E-mail: [email protected] > > ______________________________________________________________ > Dx4win mailing list > Home: http://mailman.qth.net/mailman/listinfo/dx4win > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > ______________________________________________________________ Dx4win mailing list Home: http://mailman.qth.net/mailman/listinfo/dx4win Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
