![]() Have you tried other bands? Odds are 75 meters would be worse but 20 meters should be 'quieter'. It does sound like a high noise level at you location. Speaking of power lines, does your power company read your meter remotely? Those devices are another source of noise. It could be your neighbors or it could be the power lines. If you turn off the main breaker and the noise doesn't go away, then the problem will be harder to track down. You may find that there's a device on that circuit that's generating your noise. Then, turn the main back on and one-by-one turn off each breaker until you isolate the noise. If the noise goes away, the problem is in your house. Then turn off the main circuit breaker for your house. One of the tests you can do is figure out a way to run your radio on battery temporarily (your radio won't take nearly as much current on receive as it does on transmit, so a small battery will work). How do you have your AGC set? Generally, a "slow AGC" will be better on sideband.īroadband noise can be a real headache. If you are in a noisy environment or the bands are just lousy, amplifying both just adds to the frustration. One of things to keep in mind is that your pre-amps and your RF gain control amplify both the signals and the noise. The speakers in most radios are a little cheesy. BTW, headphones will help if you aren't using them already. You may be able to find a point where the signal is strong enough above the noise that you can copy the signal better. ![]() The noise and the signal will get quieter, but you should be able to slowly increase the volume (AF gain) to compensate. Try turning your RF gain down (CCW) while you listen to a signal. You generally don't need pre-amps except on bands higher than 20m. The AC/DC power line choke suppresses common mode current to keep it out of the power line which could cause interference to other devices connected to the same power line if not suppressed.Click to expand.First off, turn the pre-amps off and leave them off for the time being. Use of the chokes often helps cure SWR problems between transceiver and a linear amp and between transceiver and antenna tuner or direct to antenna. ![]() A side benefit is a reduction in noise floor in your receiver from common mode noise.RFI to your other radios, audio/video systems, computers, telephones, etc.RFI to neighbor¡¦s electronic devices including audio/video systems, computers, telephones, garage door openers, etc."Hot mic" RFI caused by poor grounding of antennas or common mode currents from linear amps feeding unbalanced (coax fed) antennas. ![]() The ferrite filters are easy to use, don¡¦t require modification of the protected equipment and work in almost all cases, even when plug-in filters fail. Additional chokes are included to reduce common mode currents on 3 more transceiver cables including computer control, audio and another. The RFI kit is designed to be installed on your radio transceiver to reduce Radio Frequency Interference (RFI) caused by common mode current on the outside of the coax braid at the output of your radio and AC/DC power cable. Purpose: BUY THIS KIT NOW TO SOLVE YOUR RFI/EMI ISSUES - WORKS WITH MANY BRANDS OF HAM/COMMERCIAL HF RADIOS. Quick installation - immediate RFI/noise reduction. Standard Kit Includes two RFI/noise reduction ring filters for RF output, AC/DC power and 3 snap on filters for I/O cables covering RFI range of 1-300 MHz. Standard Kit (recommended for radios with only 1 HF antenna output) ![]()
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