Garmin GNC 255 User Manual

GTR 225/GNC 255 TSO Installation Manual 190-01182-02
Page 1-4 Rev. B
1.3.4.2 COM Receiver Specifications
1.3.5 VOR Specifications
Characteristics Specifications
Classes C,E, H1, and H2
Frequency Range
118.000 to 136.975 MHz, 25 kHz channel spacing
118.000 to 136.992 MHz, 8.33 kHz channel spacing
Headset Audio Output 100 mW minimum into a 500 Ω load
Audio Response Less than 6 dB of variation between 350 and 2500 Hz.
Audio Distortion Less than 5% at rated output power
AGC Characteristics
Less than 3 dB of variation in the audio output from -93 to -13 dBm
(power absorbed by a 50 load)
Sensitivity
SINAD on all channels is greater than 6 dB when the RF level is
2 uV (hard) or -107 dBm (power absorbed by a 50 load)
modulated 30% at 1000 Hz at rated audio output power
Squelch Automatic squelch with manual override
Selectivity
6 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 Specifications
Receiver 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.
Flag
The 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 produces
less than a 50% of standard deflection.
AGC Characteristics
From -99 dBm to -13 dBm input of a Standard VOR Audio Test
Signal, audio output level does not vary more than 3 dB.
Spurious Response Greater than 60 dB.
VOR OBS Bearing Accuracy
The bearing information as presented to the pilot does not have an
error in excess of 2.7° as specified by RTCA DO-196 and
EuroCAE ED-22B.
Audio Output A minimum 100 mW into a 500 load.
Deflection Response 0.5 to 2.7 seconds
Audio Response
Less than 6 dB of variation between 350 and 2500 Hz. In voice
mode, an IDENT tone of 1020 Hz Ident Tone is attenuated at least
20 dB down.
Audio Distortion
The distortion in the receiver audio output does not exceed 10% at
all levels up to 100 mW.

Garmin GNC 255 Specifications

General

Channels	760
Frequency Range	118.000 to 136.975 MHz
Channel Spacing	25 kHz
Input Voltage	11 to 33 VDC
Dimensions	159 x 50 x 193 mm