Garmin GDR 66, Installatioin Manual

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Page 1-4 GDR 66 Installation Manual
Revision A 190-00303-24
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.
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.
Table 1-5 Transceiver Specifications
Characteristics Specifications
Audio Outputs
Received Audio: 40 mW minimum into a 600 Ω load
SELCAL/Data: 10.4 mW minimum into a 600 Ω load
Audio Response
Less than 6 dB of variation between 300 and 2500 Hz
Greater than 40dB rejection above 3750 Hz
Audio Distortion
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
Receiver Dynamic Range -107 dBm to +10 dBm typical
Sensitivity
(S+N)/N on all channels shall be greater than 6 dB when the RF level
is -107dBm modulated 30% at 1000 Hz
Squelch
Selectable between 0 to 20 dB SNR. Squelch hysteresis is selectable up
to 15 dB
Spurious Response
74 dB minimum (-33 dBm signal produces no more output than desired
signal producing 6 dB (S+N)/N)
Multi-Carrier Operation
Meets multi-carrier sensitivity, distortion, and audio output level
requirements of ED-23C for Class C and Class H2 reveivers.
Transmitter Power See Section 1.4.5
Transmitter Duty Cycle 10% maximum, thermally limited, 30 second limit per transmission
Modulation Capability
The modulation shall not be less than 70% with a standard modulator
signal applied to the transmitter
Carrier Noise Level Shall be at least 45 dB (S+N)/N
Frequency Stability + / - 5ppm (-55ºC to +70ºC with a 5-minute warmup at -55ºC)
Demodulated Audio Distortion Less than 10% distortion when the transmitter is modulated at least 70%
Sidetone 1.4 Vrms into a 600 Ω load
Transmit Modulation Fidelity
Shall be less than 6 dB when the audio input frequency is varied from 350
to 2500 Hz
Microphone Sensitivity See Section 4.5.1.1
Spurious Emissions - Global
Navigation Satellite System Band
Harmonic Emission products in the band extending from 1559 to 1610
Mhz shall be no greater than -60dBm
Table 1-6 Digital Transceiver Characteristics
Characteristics Specifications
Dynamic Range +10dBm to -98dBm typical
Sensitivity Uncorrected BER of no more than 0.001 at -98 dBm
Transmitter Power See Section 1.4.5
Transmitter Duty Cycle 20% maximum, thermally limited
Modulation Capability D8PSK
Frequency Stability + / - 5ppm (-55ºC to +70ºC with a 5-minute warmup at -55ºC)
Transmit Symbol Constellation Error EVM of less than 6%
Spurious Emissions - Global
Navigation Satellite System Band
Harmonic Emission products in the band extending from 1559 to 1610
Mhz shall be no greater than -60dBm
DRAFT