[TowerTalk] Problems with my 2 el tribader yagi

[G.E. Tucker]

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
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>
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