Vertex Standard VX-4200 service manual Specifications, General

Frequency Ranges:

134 -174 MHz

Emission Type:

F3E

Channel Spacing:

12.5/20/25 kHz

Number of Channels:

8 channels (VX-4100 Series)

501 channels (VX-4200 Series)

Power Supply Voltage:

13.6 V ± 10% (50 W version)

300 mA (RX: SQL Closed)

2.5A (RX: 2 W AF Out)

Operating Temperature Range:

–22 °F to +140 °F (–30 °C to +60 °C)

Frequency Stability:

±2.5 ppm (–22 °F to +140 °C [–30 °C to +60 °C])

Antenna Impedance:

50 Ω

Case Size (W x H x D):

6.5" x 1.7" x 6.1" inch (165 x 43 x 155 mm) (W/O knob)

Weight (Approx.):

3.1 lbs (1.4 kg)

Circuit Type:

Double-conversion Superheterodyne

Intermediate Frequency:

1st: 50.85 MHz, 2nd: 450 kHz

Sensitivity (EIA 12 dB SINAD):

0.25 µV

Sensitivity (20 dB Quieting):

0.4 µV

Adjacent Channel Selectivity:

75 dB (12.5 kHz)

85 dB (25 kHz)

Spurious & Image Rejection:

90 dB

Intermodulation:

75 dB (12.5 kHz)

80 dB (25 kHz)

Hum & Noise:

44 dB (12.5 kHz)

50 dB (25 kHz)

Audio Output:

12 W @4 Ohms, 5% THD (External)

2 W @32 Ohms, 5% THD (Internal)

Modulation Type:

Variable Reactance

Power Output:

50/25/10 W (50 W version)

25/12.5/5 W (25 W version)

Conducted Spurious Emission:

75 dB below Carrier

Maximum Deviation:

±2.5 kHz (12.5 kHz)

±5 kHz (25 kHz)

FM Hum & Noise:

44 dB (12.5 kHz)

50 dB (25 kHz)

Audio Distortion:

3 % (@1 kHz)