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WHEREITIS - Properities and Methods
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vk4iu
#1 Posted : Friday, December 6, 2013 3:39:51 AM(UTC)
VK4IU

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G'Day Dennis,

With regard to ...

Object: WHEREITIS                                                                   
                                                                                    
Class Tree:                                                                         
                     UNKNOWN TYPE                                                   
                                                                                    
Properties:                                                                         
                     BEARING          N            343.8826695556    ( 343.88266956)
                     CALCDX            ????                                         
                     DXKM             N            7159.0346438663   (7159.03464387)
                     DXMILES          N            4448.4565899265   (4448.45658993)
                     LATHERE          N            -26.5960000000    ( -26.59600000)
                     LATTHERE         N            35.5200000000     (  35.52000000)
                     LONHERE          N            151.9510000000    ( 151.95100000)
                     LONTHERE         N            134.0400000000    ( 134.04000000)
                     RETURNBEARING    N            162.2427826143    ( 162.24278261)
                     REVERSEBEARING   (None)                                        
                     SETCOORDS        (None)


Can you help with definitions/properities and appropriate calls to the methods CALCDX and REVERSEBEARING.

Peter VK4IU
You can help by posting images of any errors and including your Logic version.
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WN4AZY
#2 Posted : Sunday, December 8, 2013 11:49:31 AM(UTC)
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Hi Peter:

To call CalcDX, first set the set LatHere, LonHere, LatThere, & LonThere properties, then call CalcDX. Then look at the DXMiles or DXKm properties.

ReverseBearing is a standalone function that simply returns the bearing 180-degrees off of what you pass to it. ReverseBearing(90) returns 270 for instance. It handles negatives, bearings > 360. It returns long path, given short path. Not to be confused with ReturnBearing, which gives you the direction the other guy would point his antenna to reach you.

To play with it:

There is already an instance of this object in LOGic named simply whereitis. Go to tools/advanced.database commands. Type

? whereitis.lathere
? whereitis.lonhere
This displays your coordinates, set when LOGic starts or you change stationinfo.

Now set the coordinates of the station in question:
whereitis.latthere=30
whereitis.lonthere=0

or instead of the above two lines, do:
whereitis.setcoords(30,0)

whereitis.calcdx()

? whereitis.dxkm
? whereitis.dxmiles
? whereitis.bearing
? whereitis.returnbearing

? whereitis.reversebearing(whereitis.bearing)
gets long path


What are you trying to accomplish exactly? FYI the Beam Heading Chart report makes a copy of the prefix table with empty dx and direction fields, then populates them, and reports off the copy of the prefix table. Look at the FILE OPEN commands. Using this DLL is simple. tying it into what you want to do, not so simple. Let me know if I can help.

Tnx & 73,

Dennis WN4AZY
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vk4iu
#3 Posted : Thursday, December 12, 2013 12:38:10 AM(UTC)
VK4IU

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Thanks for that Dennis.

All OK. I have been using the object for a while in reports, but forgot the exact names and did a list of the object, which prompted me to ask about the items I had never used before.

But, you have me thinking. From your previous explanation here, I took a guide from the Beam Heading Chart - Report.

scan
	whereitis.setcoords(lat, lon)
	replace dx with whereitis.dxmiles, direction with whereitis.bearing

endscan


I have not used CalcDX before. Have I been using the object correctly - not calling CalcDX directly? Calcdx looks like it calculates for any two places on the planet, while the Beam Heading example is using my QTH for one end and calling CalcDX by "magic".

I used it to update the Awards report - here - removing the old references to the Prefix table.

Thanks for the ReverseBearing explanation. I have been using several techniques found in the various reports. I shall use this function from now on.

Thanks



Peter VK4IU
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