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document transceiver specs

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This commit is contained in:
adrian 2011-11-26 09:03:29 +02:00
parent 7b101c3c70
commit b2e83c4dcc
1 changed files with 10 additions and 2 deletions
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12
src/Radio/radio.cxx
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@ -40,9 +40,15 @@ FGRadio::FGRadio() {
/** AM transmitter power in dBm.
* Note this value is calculated from the typical final transistor stage output
* small aircraft have portable transmitters which operate at 36 dBm output (4 Watts)
* small aircraft have portable transmitters which operate at 36 dBm output (4 Watts) others operate in the range 10-20 W
* later possibly store this value in aircraft description
* ATC comms usually operate high power equipment, thus making the link asymetrical; this is taken care of in propagation routines
* Typical output powers for ATC ground equipment, VHF-UHF:
* 40 dBm - 10 W (ground, clearance)
* 44 dBm - 20 W (tower)
* 47 dBm - 50 W (center, sectors)
* 50 dBm - 100 W (center, sectors)
* 53 dBm - 200 W (sectors, on directional arrays)
**/
_transmitter_power = 43.0;
@ -85,7 +91,9 @@ void FGRadio::receiveChat(SGGeod tx_pos, double freq, string text, int ground_to
***/
double FGRadio::receiveNav(SGGeod tx_pos, double freq, int transmission_type) {
// need to implement transmitter power
// typical VOR/LOC transmitter power appears to be 200 Watt ~ 53 dBm
// vor/loc typical sensitivity between -107 and -101 dBm
// glideslope sensitivity between -85 and -81 dBm
if ( _propagation_model == 1) {
return LOS_calculate_attenuation(tx_pos, freq, 1);
}