Com Transceiver Specifications; Digital Transceiver Characteristics; Table 1-5 Transceiver Specifications; Table 1-6 Digital Transceiver Characteristics - Garmin GDR 66 Installatioin Manual

1.4.6 COM Transceiver Specifications

The GDR 66 Transceiver minimally meets the requirements of DO-186B and ED-23B. Refer to Table 1-5
for detailed specifications.
Characteristics
Audio Outputs
Audio Response
Audio Distortion
Receiver Dynamic Range
Sensitivity
Squelch
Spurious Response
Multi-Carrier Operation
Transmitter Power
Transmitter Duty Cycle
Modulation Capability
Carrier Noise Level
Frequency Stability
Demodulated Audio Distortion
Sidetone
Transmit Modulation Fidelity
Microphone Sensitivity
Spurious Emissions - Global
Navigation Satellite System Band

1.4.7 Digital Transceiver Characteristics

The GDR 66 Transceiver minimally meets the requirements of DO-281A. Refer to Table 1-6 for detailed
specifications.
Characteristics
Dynamic Range
Sensitivity
Transmitter Power
Transmitter Duty Cycle
Modulation Capability
Frequency Stability
Transmit Symbol Constellation Error
Spurious Emissions - Global
Navigation Satellite System Band
Page 1-4
Revision A

Table 1-5 Transceiver Specifications

Received Audio: 40 mW minimum into a 600Ω load
SELCAL/Data: 10.4 mW minimum into a 600Ω load
Less than 6 dB of variation between 300 and 2500 Hz
Greater than 40dB rejection above 3750 Hz
Not greater than 20.0% across the band from 300 Hz to 2500 Hz with a
90% modulated signal. No greater than 7.5% with a 30% modulated
signal
-107 dBm to +10 dBm typical
(S+N)/N on all channels shall be greater than 6 dB when the RF level
is -107dBm modulated 30% at 1000 Hz
Selectable between 0 to 20 dB SNR. Squelch hysteresis is selectable up
to 15 dB
74 dB minimum (-33 dBm signal produces no more output than desired
signal producing 6 dB (S+N)/N)
Meets multi-carrier sensitivity, distortion, and audio output level
requirements of ED-23C for Class C and Class H2 reveivers.
See Section 1.4.5
10% maximum, thermally limited, 30 second limit per transmission
The modulation shall not be less than 70% with a standard modulator
signal applied to the transmitter
Shall be at least 45 dB (S+N)/N
+ / - 5ppm (-55ºC to +70ºC with a 5-minute warmup at -55ºC)
Less than 10% distortion when the transmitter is modulated at least 70%
1.4 Vrms into a 600Ω load
Shall be less than 6 dB when the audio input frequency is varied from 350
to 2500 Hz
See Section 4.5.1.1
Harmonic Emission products in the band extending from 1559 to 1610
Mhz shall be no greater than -60dBm

Table 1-6 Digital Transceiver Characteristics

+10dBm to -98dBm typical
Uncorrected BER of no more than 0.001 at -98 dBm
See Section 1.4.5
20% maximum, thermally limited
D8PSK
+ / - 5ppm (-55ºC to +70ºC with a 5-minute warmup at -55ºC)
EVM of less than 6%
Harmonic Emission products in the band extending from 1559 to 1610
Mhz shall be no greater than -60dBm
Specifications
Specifications
GDR 66 Installation Manual
190-00303-24