Hi George,
Thanks for replying so fast.
I understood that at my location correction would have a minus value.
See:
Model: IGRF2000
Latitude: -19.92 deg
Longitude: -43.90 deg
Elevation: 0.00 km
Date of Interest: 4/5/2003
--------------------------------------------------------------------------
D(+ East) I (+ Down) H X (+ N) Y (+ E) Z (+ D) F
(deg) (deg) (nt) (nt) (nt) (nt) (nt)
-21d 33m -31d 27m 20080 18676 -7376 -12281 23538
dD dI dH dX dY dZ dF
(min/yr) (min/yr) (nT/yr) (nT/yr) (nT/yr) (nT/yr) (nT/yr)
-6 -18 -71 -80 -8 -102 -8
--------------------------------------------------------------------------
So... Minus 21degrees is at the right position of my compass??
73 Carlos PY4RO
----- Original Message -----
From: "G.E. Tucker" <gtucker@bostoneng.com>
To: "Carlos Augusto S. Pereira" <py4ro@superig.com.br>;
<towertalk@contesting.com>
Sent: Sunday, April 06, 2003 1:08 AM
Subject: Re: [TowerTalk] Problems with my 2 el tribader yagi
> 21 + 21 = 42, close to the 30-40 degree pointing error you observe. Could
> you have made the magnetic declination correction in the wrong direction?
> The chart/map below indicates that at your location magnetic north is 21
> degrees West of true north, i.e. that true north is 21 degrees to the
> right/East of the compass needle.
> http://picasso.ngdc.noaa.gov/cgi-bin/seg/util/gifrmt?map_29604.gif
>
> At this site declination can be found by Latitude and Longitude:
> http://www.ngdc.noaa.gov/cgi-bin/seg/gmag/fldsnth1.pl
>
> 73 George W5VU
>
> ----- Original Message -----
> From: Carlos Augusto S. Pereira <py4ro@superig.com.br>
> To: <towertalk@contesting.com>
> Sent: Saturday, April 05, 2003 9:56 PM
> Subject: [TowerTalk] Problems with my 2 el tribader yagi
>
>
> > Dear friends,
> >
> > Some months ago I raised a 2 el. tribander Yagi. This antenna is
> manufactured in Brazil but it is very similar to the Mosley TA-32 (you can
> use it as a reference). I figured out -21 degrees of magnetic declination
> according to my latitude and longitude which I used to correct the compass
> bearing (correcting to the left - compass bearing minus 21). However I
could
> observe a difference of 30-40 degrees between the best signal and the
right
> bearing... For example... Europe is at 35 degrees but most of the best
> signals happen at 70 degrees. The same happens with K?s, ZL?s etc. always
> +30-40 degrees.
> >
> > There is not a balun connected to the antenna. The manufacturer claims
it
> is not necessary but some py friends warned me that this might be the
> problem. What you guys think about this?
> >
> > The antenna has 4 guy wires now with the correct lenght (10 ft according
> to the ARRL Handbook) and there is nothing higher than my antenna all
> around.
> >
> > There is a link with a picture of my current setup:
> >
> > http://www.electril.com.br/revista.htm
> >
> > The page is in portuguese but what matters is the antenna picture at the
> bottom.
> >
> > 73 and thanks.
> >
> > Carlos Augusto S. Pereita PY4RO
> > www.qsl.net/py4ro
> > E-mail: py4ro@superig.com.br
> > _______________________________________________
> >
> > See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless
> Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with
any
> questions and ask for Sherman, W2FLA.
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
>
>
>
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