车友俱乐部利器 | 处理HF移动车载短波设备的噪音问题

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Dealing With Noise in HF Mobile Installations

处理HF移动车载短波设备安装后的噪音问题

Many hams find that their HF mobiles receive more noise than they do usable signals. Common noise sources include the ignition system and alternator.

Spark plug noise is propagated through ungrounded body panels and the exhaust system, which is normally suspended from rubber vibration dampers. The rubberized supports insulate the exhaust from ground, essentially creating a radiating spark antenna.

To deal with spark noise, use tinned copper braid to electrically connect the hood (or bonnet) to the firewall of the vehicle. This will turn your hood into a Faraday shield.Stainless steel clamps of the proper size may be used to clamp braid to the exhaust system, (typically in two places- one near the front and one in the rear) thereby reducing the radiation of noise. DX Engineering DXE-TCB-050 Tinned Copper Braid is a half-inch wide and ideal for this purpose.

为了处理火花塞引发的噪声，会在汽车的防火墙上使用铜镀锡编织 来形成连接罩(或阀盖)。这将形成静电屏蔽罩。可以用合适尺寸的不锈钢夹夹住安装在排气系统上的铜镀锡编织 (通常是在两个地方,一个在前面,一个在后面)，从而减少噪声的辐射。DX工程的DXE-TCB-050 铜镀锡编织 友半英寸宽，该产品适合这一防噪音目的。

For alternator noise, products like the will eliminate noise from DC supply lines in radios up to 100 watts output. As a fringe benefit, noises other than alternator noise, like that of onboard system control computers, will also be reduced.

针对交流发电机噪音，产品将从直流线路供电高达100瓦输出功率来消除噪声。这项改造提供一项额外的福利，交流发电机以外产生的噪音也将减少。

You really don’t have to suffer with vehicle-generated HF noise. A little elbow grease and some handy tools and parts will go a long way toward making HF mobile operation more enjoyable.

你大可不必遭受到短波车载电台的噪音。只需稍微费点力安装一些方便的工具和零件会让HF移动通联操作更愉快。

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