[TowerTalk] Problems with my 2 el tribader yagi

[Carlos Augusto S. Pereira]

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 at bostoneng.com>
To: "Carlos Augusto S. Pereira" <py4ro at superig.com.br>;
<towertalk at 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 at superig.com.br>
> To: <towertalk at 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 at 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.
> >
> > _______________________________________________
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> >
>
>
>