Optical receiver

Fixed channel modulator

INQUIRY

Model: MIC-9902

Overview

The modulator accepts signals of 0.7～1.4Vpp from video sources such as a satellite receiver ,TV camera ,video tape recorder or TV demodulator. An external continuous adjustment provides a 0.775V±10dB/10KΩ wide range of input audio signal deviation or modulation depth.

The heterodyne conversion SAW filtered is designed for proper vestigial sideband selectivity. It enables the modulator to be used in adjacent channel systems.

The use of a passive, high selectivity single-channel filter assures a spurious-free RF output.

Features

● Base-band video and audio inputs.

● All systems and channels between 47 and 870MHz.

● Heterodyne conversion. IF SAW filter. High vestigial sideband selectivity.

● Adjustable video and audio modulation index.

● Output TV channel frequency through VCO-PLL synthesis.

● Adjustable RF output level.

● Adjustable A/V level.

Specifications

Items	Units	Parameters
Video
Input level	V_PP	0.7～1.4
Input impedance	Ω	75
Modulation depth	%	87.5
Flatness in band	dB	≤±1.5
Differential gain	%	≤5
Differential phase	^o	≤5
Cr/L delay	ns	≤40
Weighted S/N ratio	dB	≥60
K-factor（2T pulse）	%	≤4
Input return loss	dB	≥20
Audio
Input level（external adjustment）	dB	0.775V±10
Input impedance (unbalance)	Ω	10k
Adjustable peak deviation	kHz	±50
Pre-emphasis	μs	50
Flatness (40Hz …15kHz)	dB	≤±1.5
Distortion(fm=1kHz;△f=50kHz)	%	≤1
S/N ratio	dB	≥60
RF output
Carrier frequency tolerance	kHz	≤5
Carrier frequency distance tolerance	Hz	≤100
Nominal output level	dBμV	≥113
A/V RATIO (external adjustment)	dB	-10 … -20
Output impedance	Ω	75
Output return loss	dB	≥12
Spurious in band	dB	≤-60
Side-band Suppression	dB	≥65
Output level adjustment	dB	0 … -20
C/N ratio in channel	dB	≥60
General
Supply voltage	V	AC190～250
Consumption	mA	400
Operating temperature	℃	-10 … ＋55
Video, audio connector type		“RCA”
IF and RF connector type		“F”
Outside dimensions(h×w×d)	mm	483×130×44
Packed weight	kg	2