Radio Frequency Calculations Page for Internet Radios (DSSS, FHSS, OFDM)

Most RF calculation pages only give you half the story unless your two endpoints happen to be identical (most aren't). Since we are usually interested in two-way behavior, we have to perform the calculations twice (once for each direction). This page will allow you to fill in all the information on each site and will provide you, at a glance, a good indication of what you should expect to see excepting environmental conditions (including but not limited to interference and second and fourth fresnel zone signal cancellation effects).

NOTE: Form is based on accepted calculations for 1000MHz (1GHz) to 6000MHz (6GHz). Use for other frequencies not recommended and may yield inaccurate results.

Distance calculations (if you have the Geos but not the distance)

Site A TX:		N S		W E
Site B TX:		N S		W E

Geo coords must be in the form of Degrees:Minutes:Seconds or Degrees:Minutes.decimals or Degrees.decimals.

Distance Site A to Site B:		milesmileskilometers
Frequency:		MHz (not GHz)
TX Power Site A*:		decibelsdecibelsmilliwattswatts
TX Power Site B*:		decibelsdecibelsmilliwattswatts
TX Antenna gain Site A:		db
TX Antenna gain Site B:		db.
Optional values:
RX Sensitivity Site A:		db
RX Sensitivity Site B:		db
Cable Loss Site A**:		db
Cable Loss Site B**:		db

*Transmitter output power. If you are using an amplifier or frequency converter, this is the output power of that amp or frequency converter.
**Cable loss should be the combined loss of cables, connectors, splitters, etc., between the transmitter output (radio card, amp, or frequency converter) and the antenna.

Form created by David A. Bandel, AI4FG, HP1DAB
RFCalcs v0.2
Released under the GPL. Code for rfcalcs.pl and results.pl