I really don't want to over simplify the process....but...an first IMHO one should determine how much noise is actually in the shack. A simple test is to put a 12 battery on the radio and listen to the noise level(s). then go and cut the main circuit breaker where city power comes into the house and not just the shack.
If you are not experiencing any noise drop turning your ham shack into a "clean room" may not be worth the effort or experience. If there are noise proud devices in the house these can be localized by turn house breakers on and off while will having the radio on a battery with the RX antenna. If the AC breaker to the shack makes any increase, it might be easier to eliminate the device(s) one by one. Wall warts, routes, lamp voltage controllers, switching supplies, and thermostats etc. can all be found this way without the expense of a EMF/EMI chamber to operate out of. Here in the tropics the propagated QRN normally is so many db's stronger than any device such a simple loop antenna, like the one that comes with the AM/FM tuners may be worth trying as a sense antenna. Also a hand held portable AM radio tuned to 1710 noise can give you some ability to find a null direction inside the house. A multi-band portable with a high range of 30 Mhz can get you closer to some noise source such as power line stuff but remember the vertical rod is the RX antenna past the BC band. Some radios and amateur HT's and scanners even do AM in the aircraft band starting at 108Mhz. If you hear noise with the same foot print that you have in the shack, when you cruise around with the portable, your are probably standing next to the noise source. 73 Herb Schoenbohm, KV4FZ On 6/24/2012 5:30 PM, Bruce wrote: > Regards > Jose Carlos > N4IS > > > > > Great information Jose. Good to see various ways to achieve an effective DX > station from your small lot. Your call sign in the 7o6t log book says > a lot about your station. > > It's interesting, and fun to plug in various North American call signs into > the DX-pedition logs to see who's making it. > > 73 > Bruce-K1FZ > > > > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK > > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
