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improve S/N for AM car radio by a factor of 2...5...10?
Presumably you mean 810 kHz. *What is the source of the noise? Noise generated in the receiver is usually insignificant in the medium-wave band. If the cause is other transmissions on the same and nearby frequencies you may not gain much by changing the antenna, but a receiver with better channel (IF) filtering may help if there is any contribution from adjacent channels. *If the noise is coming from your car (does it improve when you park in a rural area) then you may need to improve the RF suppression of its circuitry (e.g. ignition if it's a petrol engined car). I expect you can work out what tests would be needed to locate the principal sources of the noise. Chris Yes, KHz, sorry. The noise goes up several fold when I pass underneath bridges/pass big trucks, etc. Does this suggest that the noise is from other frequencies? |
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