$theta=$theta-2.*$pi if( $theta >= $pi);
my ($lats, $lons); # subsolar coordinates (rad)
-my $dB1 = 20; # transmitter output power (dBW)
+my $dB1 = 26; # transmitter output power (dBW)
my $delay; # path delay (ms)
my $psi; # sun zenith angle (rad)
my $dhop; # hop great-circle distance (rad)
my $height; # height of F layer (km)
my $time; # time of day (hour)
-my $rsens = -123; # RX sensitivity
+my $rsens = -128; # RX sensitivity
my @freq = qw(1.8 3.5 7.0 10.1 14.0 18.1 21.0 24.9 28.0 50.0); # working frequencies (MHz)