M304 Specifications
| GENERAL |
| Frequency Range |
| Transmit: |
156.025-157.425 MHz |
| Receive: |
156.050-163.275 MHz |
|
| Usable channels |
USA, CAN, INT, WX channels |
| Type of emission |
16K0G3E, 16K0G2B |
| Power supply |
13.8V DC ±15% |
Current drain
(at 13.8V DC) |
| Tx |
5.5 A (at 25W output) |
| Rx |
1.5 A (at AF max.) |
|
| Operating temperature range |
-20°C to +60°C; -4°F to +140°F |
| Antenna impedance |
50Ω (SO-239) |
| Dimensions (WxHxD, projections not included) |
153x67x133mm, 61/32x25/8
x 51/4 inches |
| Weight (approx.) |
825g; 1.8lb |
| NMEA formats |
Version 2.0 or 3.01, RMC; GGA, GNS, GLL |
|
| TRANSMITTER |
| Output power |
25 W or 1 W (at 13V DC) |
| Modulation system |
Variable reactance frequency modulation |
| Max. freq. deviation |
±5 kHz |
| Frequency error |
±10 ppm |
| Spurious emissions |
Less than -70 dBc (at 25W) |
| Adj. channel power |
More than 70 dB |
| Audio harmonic distortion |
Less than 10% (at 60% dev) |
| Residual modulation |
More than 40 dB |
|
| RECEIVER |
| Intermediate freq. |
1st 21.7 MHz, 2nd 450 kHz |
| Sensitivity |
0.22μV typical at 12dB SINAD |
| Squelch sensitivity |
Less than 0.22μV |
| Adj. Ch. selectivity |
More than 70dB |
| Spurious response |
More than 70dB |
| Intermodulation |
More than 70dB |
| Hum and noise |
More than 40dB |
| Audio output power |
4.5 W typical at 10% distortion with a 4Ω load |
|
|
