论文部分内容阅读
最近笔者按本刊1981年第9期《怎样把NTSG制彩色电视机改装成PAL制的》(以下简称《改制》)一文,对一台日本产三洋18-R306机进行了改制,效果较好.针对有些日产机采用晶体滤波或冲击振荡型的副载波恢复电路而无法取出7.8千赫信号的特点,我在电路上增设了压控振荡器,并对《改制》中介绍的PAL-S电路作了一些改动,现将自己的一点体会与大家交流.一、改动电路前的准备准备工作包括材料准备和技术准备.材料准备除晶振、变容二极管外,其它均为通用件,一般不难买到.技术准备主要是弄清电路结构,找出色通道、同步检波电路色信号的引入点以及副载波引入点等.如无原机
Recently, according to the publication of the ninth issue in 1981, “how to convert NTSG color TV into PAL system” (hereinafter referred to as “restructuring”) article, a Japanese-made Sanyo 18-R306 machine was restructured, the effect is better For some Nissan machines using crystal filter or shock oscillation type subcarrier recovery circuit can not be taken out of 7.8 kHz signal characteristics, I added a voltage-controlled oscillator on the circuit, and “restructuring” described in the PAL-S circuit Made a number of changes, is now one of their own experience to communicate with you. First, to prepare the preparation before the circuit changes, including material preparation and technical preparation. Material preparation in addition to crystal, varactor, the other are common parts, generally not difficult Buy. The main technical preparation is to find out the circuit structure, find the color channel, synchronous detection circuit color signal introduction point and subcarrier introduction point, etc. If no original machine