Instructions

• Make sure Java Script is enabled in the Edit/Preferences/Advanced menu in Netscape 3+ or your Java Script enabled browser.

• To remove an old value and enter a new value, double-click the value box to highlight the old value then enter a new value.  Then either press the Enter key, the TAB key, or click another value box to enter the new value.

• When using the TAB key to change to a new value box, press the Delete key to erase old value.  The cursor position is remembered in each value box, so only pressing the Delete key might not always remove the whole value.  It would be better to double-click the value box then type a new value.

Antenna Size

Enter antenna diameter in FEET.  For example: 6, 8, 10, 12, etc.  If you want the program to determine antenna size, then enter the db gain required in the gain field.  The program will determine antenna size required to achieve this gain at the operating frequency.

Antenna Gain

Enter antenna gain required in db.  For example: 41.3, 38.6, 35, etc.  If gain of antenna is unknown, enter antenna size and the program will determine the antenna gain at the operating frequency.  Entry to one decimal place.

Feed Line Loss

Enter total feed line loss in db.  For example: 2.32, 4.10, 3, 1.0, etc.  Include any filter losses in this figure.  Loss may be expressed to two decimals.

Power

Enter transmitter power in watts or dbm.  Watts are automatically converted into dbm.  dbm = db above one milliwatt.  Entry may be to one decimal place.

Coordinates Latitude & Longitude

If latitude and longitude of both sites are known, enter degrees, minutes and seconds.  Select either North or South for latitude, and East or West for longitude.  The program will calculate distance between these two points in statute miles and calculate true direction of each antenna.

Path Distance

Enter path distance if known or if latitude and longitude of both sites are not known.  Entry is expected in miles.  For example: 26.5, 25, 15.3, etc.  Entry to one decimal place.

Frequency

Enter frequency in MHz up to one decimal place.  For example: 6175, 2000, 13250.5, 7050.5, etc.

Receiver Threshold

Enter level of receiver threshold.  Normally a negative number, this is the signal level required to give 37db S/N ratio.  Fade margin is calculated from this level plus 12 db.  49db S/N level is considered to be a noise free picture.

Helpful Hints

• Values in blue are calculated.

• With every new value entered, a calculation is performed.

• If Antenna Size is entered, Antenna Gain is calculated

• If Antenna Gain is entered, Antenna Size is calculated

• If Coordinates are entered, Path Distance is calculated.

• If Path Distance is entered, Coordinates are cleared.

• If Watts are entered, Power dbm is calculated.

• Click N/S or E/W to change coordinate direction.

• Press the Re-calculate button if a calculation is not performed automatically.