Bộ điều chế RF 4 kênh Pacific PDA2500M

PDA2500M SAW FILTER MODULATOR

FEATURES

□ IF processing with three SAW filters.

 □ PLL technique with high precision.

 □ Clamp circuit with high anti-hum performance.

 □ Adopt MMIC circuit and surface-mounted technique on key parts

 

SPECIFICATIONS

  Freqency confine:            45 to 860MHz

Output Level:                35 to 55dBmv﹐continuously adjustable from front panel

Output Impedance:           75 ohm

Audio/Video Stability:         adjustable –10 to –20 dB below video carrier

Frequeucy Stability:           ±10KHz (±5KHz in aeronautical band)

Spurious Output:             65dB below video carrier With A/V ratio＠－20dB

RF output Return loss:         ≥14dB

  Input Level:                  0.5Vp-p min for 87.5% modulation

  Input Type:                  Composite video negative sync

  Visual C/N:                  65dB＠ 6 MHz BW

  Frequency Response:          ±1.5 dB (30KHz to 6 MHz)

Hum and Noise:              －60 dB＠ 87.5%

Differential Gain(DG):        ≤3%

Differential Phase(DP):        ≤3°

  Baseband Input Impedance:    600 ohms unbalanced

Baseband Input Level:         0.5Vp-p for 25KHz deviation

Pre-emphasis:                75 microsecond

Flatness:                     1.5 dB (50Hz to 15KHz)

Video/Audio Separation:       5500±5 KHz（PAL-B/G）

Power Input:                 180 to 230 VAC﹐50Hz 20W

Operating Temperature:        －10℃ to 40℃

Dimensions:                  19″L×5.12″D×1.75″H

Weight:                      2.5 Kg