Y-axis scaling for VOACAP Time & Distance graphs

VOACAP Quick Guide: Home

 

The VOACAP Time and Distance Plots (Run > Time and Run > Distance) are very informative graphs that let you compare the output parameter values for user-specified frequencies. The Time Plot lets you view the output parameters on a 24-hour scale, e.g. if you want to see which of the specified frequencies is best at the given time of day.

The Distance Plot calculates the variation of output parameter values with regards to distance at the user-specified hour.

By default, most of the output parameter values are automatically scaled. There are, however, some parameters which could benefit from a fixed Y-scale. The Y-axis scaling info is found in C:\itshfbc\database\voadist.gph.

VOADIST  GPH	VOACAP Point-to-Point parameter Y-scale info

Syntax

The variable names are:

  xfact,icode,zmin,zmax,zlab,zinc

  xfact = The multiplier factor, usually 1 or 100 [for percentages]
  icode = 0 = zmin & zmax are fixed.
        = 1 = zmin & zmax are calculated from data.
  zmin  = minimum Y value on axis
  zmax  = maximun Y value on axis
  zlab  = number label at every ZLAB increment
  zinc  = tick mark at every ZINC increment

Example 1

SDBW  = Median signal power at receiver (dBW)
        Signal Power at Receiver (dBW)
        1. 0  -160. -50. 10.  2.

Explanation:

Example 2

SNR   = Median signal-to-noise ratio (dB)
        Signal-to-Noise (Median) (dB)
        1. 0  0. 100. 10.  2.

Explanation:

Example 3

SNRxx = Signal-to-Noise ratio (dB) at Req. Rel.
        Signal-to-Noise at Req. Rel. (dB)
        1. 0  0. 100. 10.  2

Explanation:

Thank-you

A big thank-you to Greg Hand who explained the syntax.