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NOISE BLANKER CB
- Thread starter k8krh
- Start date
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Running the positive lead directly to the battery if at all possible and running the ground to the vehicle body as close to the radio as possible has helped me with AM/SSB equipment, both CB and Ham. This helps with noise being carried by the power leads but noise being radiated by the vehicle as RF is another matter, which is usually what would give a S level. I assume it doesn't have this S level with the engine not running.
XTS3000
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- Nov 4, 2005
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- 1,098
ANL is a passive (non powered) simple circuit designed to get rid of power line noise. It’s a simple diode that is switched in or out the final stage of the receiver (before it reaches the AF amp) to hopefully get rid of 13.8v power line noise.
NB is an active circuit that detects noise pulses that come in through the antenna, and generates an equal but opposite pulse to get rid of impulse noise from things like noisy/bad 120v power lines on poles when driving past them.
Where is your noise coming from? Simple way to tell..... when your getting the noise, disconnect the antenna and see if the noise goes away. If the noise goes away, then your noise is entering the radio via the antenna/coax. If this is the case, relocate the antenna coax feed line. If relocating doesn’t help, only thing you can do is get a different antenna with better shielded coax could solve your noise problem. Also, keep in mind not all NB circuits are created equal. Some work better than others.
If you disconnect the antenna and the noise is still there, the noise is coming in through the power line. One thing that will help power line noise is to separate the positive and negative lines on your power source and twist then together.... Just like Ethernet cables are twisted together to prevent “cross talk”. I know twisting the power wires may sound crazy, but it’s worked on almost every 12v power line noises I’ve come across dealing with AM receivers.
Sorry to be so long winded, but re read my advice a few times if it doesn’t make sense the first time.
Edited to correct spelling errors. (I’m on an iPhone and spell correct is lame)
NB is an active circuit that detects noise pulses that come in through the antenna, and generates an equal but opposite pulse to get rid of impulse noise from things like noisy/bad 120v power lines on poles when driving past them.
Where is your noise coming from? Simple way to tell..... when your getting the noise, disconnect the antenna and see if the noise goes away. If the noise goes away, then your noise is entering the radio via the antenna/coax. If this is the case, relocate the antenna coax feed line. If relocating doesn’t help, only thing you can do is get a different antenna with better shielded coax could solve your noise problem. Also, keep in mind not all NB circuits are created equal. Some work better than others.
If you disconnect the antenna and the noise is still there, the noise is coming in through the power line. One thing that will help power line noise is to separate the positive and negative lines on your power source and twist then together.... Just like Ethernet cables are twisted together to prevent “cross talk”. I know twisting the power wires may sound crazy, but it’s worked on almost every 12v power line noises I’ve come across dealing with AM receivers.
Sorry to be so long winded, but re read my advice a few times if it doesn’t make sense the first time.
Edited to correct spelling errors. (I’m on an iPhone and spell correct is lame)
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