[Dx4win] Headings

[Kjell W. Strom]

Get your variation, also named declination, here:

http://www.ngdc.noaa.gov/geomagmodels/Declination.jsp

73,
Kjell, PB3SM - SM6CPI
 


> -----Original Message-----
> From: dx4win-bounces at mailman.qth.net 
> [mailto:dx4win-bounces at mailman.qth.net] On Behalf Of James G.
Dean
> Sent: 18 October 2009 14:58
> To: 'Jim Reisert AD1C'; ON4AOI
> Cc: dx4win at mailman.qth.net
> 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: dx4win-bounces at mailman.qth.net [mailto:dx4win- 
> > > bounces at mailman.qth.net] 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, <jjreisert at alum.mit.edu>,
http://www.ad1c.us 
> > >
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> 
> Jim Dean, VE3IQ
> 1134 Plante Drive
> Ottawa, ON, Canada, K1V 9E8
> 
> Tel: (613) 733-5585
> Fax: (613) 733-7613
> E-mail: jgdean at sympatico.ca
> 
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