From b2e83c4dcc0b9c458e45afaba6ea51176a118a67 Mon Sep 17 00:00:00 2001 From: adrian <adrian@localhost.com> Date: Sat, 26 Nov 2011 09:03:29 +0200 Subject: [PATCH] document transceiver specs --- src/Radio/radio.cxx | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/src/Radio/radio.cxx b/src/Radio/radio.cxx index e1b7ad9fe..fb73dffed 100644 --- a/src/Radio/radio.cxx +++ b/src/Radio/radio.cxx @@ -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); }