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Author Topic: DXCC Countries List and Beam Headings  (Read 8112 times)
G3RZP
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Posts: 4391




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« Reply #15 on: December 24, 2012, 09:58:40 AM »

See http://ac6v.com/greatcircle.htm for the formula to calculate bearing and distance. Shouldn't be hard to write a little program and produce your own table.

As 'BYU says, most beams are wide enough at HF that 20 degrees either way won't make much odds. My 21 element 70 cm beam is +/- 11 degrees at -3dB! Unless you are somewhere that magnetic North is a long way from true N, it doesn't make much odds either. Especially if you have a skewed path.....
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M6GOM
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Posts: 876




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« Reply #16 on: December 24, 2012, 11:54:09 AM »

I used this site to generate an Azimuth map. You just need to enter your Maidenhead Square for your location.

http://ns6t.net/azimuth/azimuth.html
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WB2WIK
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Posts: 20545




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« Reply #17 on: December 25, 2012, 01:29:36 PM »

I usually just peak the beam for the best received signal from the other station. 

That works, and doesn't take much time.

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N4CR
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Posts: 1653




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« Reply #18 on: December 25, 2012, 06:29:40 PM »

I usually just peak the beam for the best received signal from the other station. 

That works, and doesn't take much time.

Yeah, but that's so... Practical.

You're gonna confuse the guy staring at the computer screen.
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73 de N4CR, Phil

We are Coulomb of Borg. Resistance is futile. Voltage, on the other hand, has potential.
KB4QAA
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Posts: 2269




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« Reply #19 on: December 26, 2012, 08:41:42 AM »

Yes, align the antenna to true North.

If you are going to the expense and hassle of putting up a beam, if you buy the better grade of coax, if you buy quality connectors instead ham show grab bin bargains, if you use computer software to aid operations, why not spend the extra few minutes to have an accurate alignment?

Zero your indexer and rotor
Take you magnetic compass sighting
Align the beam to Magnetic North
Apply the declination/variation and take sighting
Align the beam to True North
Tighten down the bolts.
Done.  Just a couple extra steps.
« Last Edit: December 26, 2012, 08:46:09 AM by KB4QAA » Logged
K7KBN
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Posts: 2765




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« Reply #20 on: December 26, 2012, 09:57:02 AM »

On a clear night, note the position of the North Star from the base of your antenna.  Mentally (or actually if necessary), drop a plumb line from that point to the ground, noticing just which tree, building or other identifiable object the plumb line falls on.

Turn the rotator to NORTH.  Point the antenna toward that tree, building or whatever.  Tighten everything down.  No need to mess with magnetic compasses.

You might need to recruit a neighborhood Boy Scout to locate Polaris for you.
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73
Pat K7KBN
CWO4 USNR Ret.
KY6R
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Posts: 3133


WWW

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« Reply #21 on: December 26, 2012, 11:50:52 AM »

http://www.njdxa.org/dx-tools/beam-headings.php

I like DX Atlas the best though . . . .
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W1JKA
Member

Posts: 1619




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« Reply #22 on: December 27, 2012, 04:12:37 AM »

     Some readers may be confused by the term" Declination" in lieu of Variation.
Can Dead Men Vote Twice And Eat Too.
      Where D is deviation not Declination and unless you were in a magnetically rich environment such as shipboard or nearby electrical generation sources deviation would not generally be a factor if using a magnetic compass and correcting to true north.
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