Garmin GTR 225 Installation Manual

Also see for GNC 255: Pilot's guide

Contents

Garmin GTR 225 Installation Manual Manual pdf 18 page image

GTR 225/GNC 255 TSO Installation Manual 190-01182-02Page 1-4 Rev. B1.3.4.2 COM Receiver Specifications1.3.5 VOR SpecificationsCharacteristics SpecificationsClasses C,E, H1, and H2Frequency Range 118.000 to 136.975 MHz, 25 kHz channel spacing118.000 to 136.992 MHz, 8.33 kHz channel spacingHeadset Audio Output 100 mW minimum into a 500 Ω loadAudio Response Less than 6 dB of variation between 350 and 2500 Hz.Audio Distortion Less than 5% at rated output powerAGC Characteristics Less than 3 dB of variation in the audio output from -93 to -13 dBm(power absorbed by a 50 load)SensitivitySINAD on all channels is greater than 6 dB when the RF level is2 uV (hard) or -107 dBm (power absorbed by a 50 load)modulated 30% at 1000 Hz at rated audio output powerSquelch Automatic squelch with manual overrideSelectivity6 dB BW is greater than + 7 kHz for 25 kHz channeling.60 dB BW is less than ±22 kHz for 25 kHz channeling.6 dB BW is greater than ±3.5 kHz for 8.33 kHz channeling.60 dB BW is less than ±7.37 kHz for 8.33 kHz channeling.Characteristics SpecificationsReceiver Audio Sensitivity At -103.5 dBm (S+N)/N is not less than 6 dB.Course Deviation Sensitivity -103.5 dBm or less for 60% of standard deflection.FlagThe VOR/LOC Course Deviation Flag must be flagged when:• RF signals are absent.• 9960 Hz modulation is absent.• either one of the two 30 Hz modulations are absent.• the level of a standard VOR deviation test signal producesless than a 50% of standard deflection.AGC Characteristics From -99 dBm to -13 dBm input of a Standard VOR Audio TestSignal, audio output level does not vary more than 3 dB.Spurious Response Greater than 60 dB.VOR OBS Bearing AccuracyThe bearing information as presented to the pilot does not have anerror in excess of 2.7° as specified by RTCA DO-196 andEuroCAE ED-22B.Audio Output A minimum 100 mW into a 500 load.Deflection Response 0.5 to 2.7 secondsAudio ResponseLess than 6 dB of variation between 350 and 2500 Hz. In voicemode, an IDENT tone of 1020 Hz Ident Tone is attenuated at least20 dB down.Audio Distortion The distortion in the receiver audio output does not exceed 10% atall levels up to 100 mW.