set project 1.0
 set wavelength [/ [* .95 300E6] [*  98.E6] ]   # 2.908 meters
 set wavelength [/ [* .95 300E6] [*  57.E6] ]   # 5.0 meters
 set wavelength [/ [* .95 300E6] [*  100.E6]]   # 2.85 meters

        # pretty print from autoindent and ased editor
        # Twin Lead Dipole Antenna calculator
        # written on Windows XP on eTCL
        # working under TCL version 8.5.6 and eTCL 1.0.1
        # gold on TCL WIKI, 15dec2016
        package require Tk
        namespace path {::tcl::mathop ::tcl::mathfunc}
        frame .frame -relief flat -bg aquamarine4
        pack .frame -side top -fill y -anchor center
        set names {{} {center frequency megahertz :} }
        lappend names {optional, :}
        lappend names {optional, :}
        lappend names {answers: whole wavelength meters :}
        lappend names {half wavelength  meters :}
        lappend names {corrected .5L antenna length  meters: }
        lappend names {lead meters: }
        lappend names {height above ground meters:} 
        foreach i {1 2 3 4 5 6 7 8} {
            label .frame.label$i -text [lindex $names $i] -anchor e
            entry .frame.entry$i -width 35 -textvariable side$i
            grid .frame.label$i .frame.entry$i -sticky ew -pady 2 -padx 1 }
        proc about {} {
            set msg "Calculator for Twin Lead Folded Dipole Antenna 
            from TCL WIKI,
            written on eTCL "
            tk_messageBox -title "About" -message $msg } 
       proc pi {} {expr acos(-1)}       
       proc calculate {     } {
            global answer2
            global side1 side2 side3 side4 side5
            global side6 side7 side8
            global testcase_number
            incr testcase_number 
            set side1 [* $side1 1. ]
            set side2 [* $side2 1. ]
            set side3 [* $side3 1. ]
            set side4 [* $side4 1. ]
            set side5 [* $side5 1. ]
            set side6 [* $side6 1. ]
            set side7 [* $side7 1. ]
            set side8 [* $side8 1. ]
            set megahertz $side1  
            set conv_factor $side5 
            set speedoflight 300E6
            #set velocityfactor .87 ; alternate velocity factor
            set velocityfactor .95
            set wavelength [/ [* $velocityfactor $speedoflight] [* $megahertz 1E6 ] ]
            set halfwavelength [* $wavelength .5 ]
            set antennacorrection [* $halfwavelength 1.01 ]
            set antennalead .5
            set heightaboveground [* 2. $wavelength ]
            set side4 $wavelength
            set side5 $halfwavelength
            set side6 $antennacorrection 
            set side7 $antennalead
            set side8 $heightaboveground
                    }
        proc fillup {aa bb cc dd ee ff gg hh} {
            .frame.entry1 insert 0 "$aa"
            .frame.entry2 insert 0 "$bb"
            .frame.entry3 insert 0 "$cc"
            .frame.entry4 insert 0 "$dd"
            .frame.entry5 insert 0 "$ee"
            .frame.entry6 insert 0 "$ff" 
            .frame.entry7 insert 0 "$gg"
            .frame.entry8 insert 0 "$hh" 
             }
        proc clearx {} {
            foreach i {1 2 3 4 5 6 7 8 } {
                .frame.entry$i delete 0 end } }
        proc reportx {} {
            global side1 side2 side3 side4 side5
            global side6 side7 side8 
            global testcase_number
            console show;
            puts "%|table $testcase_number|printed in| tcl wiki format|% "
            puts "&| quantity| value| comment, if any|& "
            puts "&| testcase number:|$testcase_number | |&"
            puts "&| $side1 :|center frequency megahertz |   |&"
            puts "&| $side2 :|optional| |& "
            puts "&| $side3 :|optional| |& "
            puts "&| $side4 :|wavelength meters| |&"
            puts "&| $side5 :|half wavelength meters  | |&"
            puts "&| $side6 :|corrected .5L antenna length meters or [expr $side5*39.37008] inches  |  |&"
            puts "&| $side7 :|antenna lead meters |  |&"
            puts "&| $side8 :|height above ground meters|  |&"
            }
        frame .buttons -bg aquamarine4
        ::ttk::button .calculator -text "Solve" -command { calculate   }
        ::ttk::button .test2 -text "Testcase1" -command {clearx;fillup 98.1 1. 1.0 2.908  1.45 1.46 .5 5.8}
        ::ttk::button .test3 -text "Testcase2" -command {clearx;fillup 100.10 1. 1.0 2.85  1.425  1.439 0.5 5.7 }
        ::ttk::button .test4 -text "Testcase3" -command {clearx;fillup 57.10 1. 1.0 5.0  2.5  2.525 0.50 10.10 }

        ::ttk::button .clearallx -text clear -command {clearx }
        ::ttk::button .about -text about -command about
        ::ttk::button .cons -text report -command { reportx }
        ::ttk::button .exit -text exit -command {exit}
        pack .calculator  -in .buttons -side top -padx 10 -pady 5
        pack  .clearallx .cons .about .exit .test4 .test3 .test2   -side bottom -in .buttons
        grid .frame .buttons -sticky ns -pady {0 10}
               . configure -background aquamarine4 -highlightcolor brown -relief raised -border 30
        wm title . "Twin Lead Folded Dipole Antenna Calculator"      

  puts " %| testcase $testcase_number | value| units |comment |%"
  puts " &| volume| $volume| cubic meters |based on length $side1 and width $side2   |&"