Radioddity DB25-D - DB25-D Receiver Specifications; DB25-D Transmitter Specifications

Radioddity Extended manual for Radioddity DB25-D, DB40-D & GD-88 v3.0
© Radioddity 2023 page 226 of 252
18.2 Receiver of the DB25-D
Parameter
VHF
UHF
Frequency Range
136…174 MHz
400…480 MHz
Channel Spacing
12.5 kHz / 25 kHz
Operating Bandwidth
≤±5 kHz @ 12.5 kHz / ≤±7 kHz @ 25 kHz
Frequency stability (-20 °C … +25
°C)
± 1.5 ppm
IFs
51.550 MHz
FM modulation Type
12.5 kHz: 11KOF3E / 25 kHz: 16KOF3E
Sensitivity (12 dB SINAD)
0.25 µV @ 12.5 kHz / 0.2 µV @ 25 kHz
Squelch Selectivity
0.2 µV @ 12.5 kHz / 0.15 µV @ 25 kHz
Analogue sensitivity
0.3 µV / 0.25 µV
Digital sensitivity (5 % BER)
0.25 µV / 0.2 µV
Intermodulation
≥70 dB
Adjacent Channel Selectivity
≥65 dB @ 12.5 kHz / ≥70 dB @ 25 kHz
Spurious rejection
65 dB
Image Rejection
≥70 dB
Rated audio
500 mW
Audio Distortion @ rated audio
≤5 %
FM hum & noise
-40 dB @ 12.5 kHz / -45 dB @ 25 kHz
Audio response
+1 dB, -3 dB
Conducted / radiated emission
-57 dBm
18.3 Transmitter of the DB25-D
Parameter
VHF
UHF
Frequency Range
144…148 MHz
420…450 MHz
Channel Spacing
12.5 kHz / 25 kHz
Frequency stability (-20°C, +25°C)
± 1.5 ppm
Low Power
5 W
5 W
High Power
20 W
20 W
FM modulation Type
12.5 kHz: 11KOF3E / 25 kHz: 16KOF3E
Modulation restriction
±2.5 dB @ 12.5 kHz / ± 5 dB @ 25 kHz
FM hum & noise
-40 dB @ 12.5 kHz / -45 dB @ 25 kHz
Conducted / radiated emission
-36 dBm < 1GHz / -30 dBm > 1 GHz
Adjacent channel selectivity
-60 dB @ 12.5 kHz / -65 dB @ 25 kHz
Maximum Deviation
≤±2.5 kHz @ 12.5 kHz
≤±5.0 kHz @ 25 kHz
Spurious Emission
≤65 dB below carrier
Modulation Distortion
≤5 % (300…3000 Hz)
Audio Response
+1 dB, -3 dB
Audio Distortion
3%
4FSK digital modulation
12.5 kHz data: 7K60F1D and 7K60FXD
12.5 kHz audio:7K60F1E and 7K60FXE