Question about Radio Shack TRC-447 CB Radio
I just got this radio and had it peaked and tuned then took it and had my buddy set up the standing wave, swr, etc... But i'm still catching around 3 pounds of noise with my car on or off. I'm using a brand new wilson 5000 and an old palomar tx-75 also. Can someone please let me know how to get rid of the noise???
Use the radio in another vehicle, or better yet on a power supply. This will rule out the car's power as a culprit. AM radios like CB are prone to ambient noise.
Posted on Nov 05, 2008
You might have some dirty power as well. Even if your car is off, there are still electronics that are on. For instance, my car stereo system does not fully turn off even when the car is off, it still cranks some power to keep things in your memory like the time, channel presets, etc. The vehicle computer also never turns off. These devices could be adding small amounts of "dirty power" to your electrical system. This would add small electrical pulses through your DC power. Pyramid makes a noise canceling device called the NS-10 for like $5 or so. It can hold up to 10 amps of current and is connected in-line between the cb radio and the battery on the positive cable. I put this on mine and car noise is reduced as much as 60% if I had to guess. What it does is reduce or eliminate the pulses in your DC that can cause radio interference before the pulses get to your radio. Hope that helps.
Posted on Jun 30, 2008
I would think the noise you are picking up is atmospheric noise ( space noise as some of them call it ) or also known as sun spot noise ( skip ). Since we are in a downward skip pattern with the sun spots the atmosperic niose remains a bit higher than we may like. When the niose comes in, it appears as a static niose, so if this is the niose you are experiancing, I assume this should quiet a bit as time goes along for the next few years. ( until skip conditions start on an upswing again ) This happens in a cycle every 7 to 11 years on a normal basis. One thing you can do is purchase a noise chopper devise. They sell for between 20 and 30 dollars and can be switched to a low chop ( filter ) or a high chop ( filter ). You need to know that if you use one of these devises to illimenate noise, it that you also illimanate signal. ( you receive less ). I hope in some way this answer has helped. If I can be of any more assistance, please feel free to email me at this address or a personal email at email@example.com or call my shop at 307-266-4675, Mod- Fri 9AM-3PM.
Ed ( Radio Man)
Posted on Apr 20, 2008
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