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Turning a 1/4 wave vertical upside down
On 12/17/2013 4:45 PM, Jeff Liebermann wrote:
On Tue, 17 Dec 2013 07:42:01 -0500, Jerry Stuckle wrote: Actually, if you have the right equipment, you can narrow it down in a very short time. What is the right equipment? A portable spectrum analyzer is not in my budget and my bench test equipment is too heavy for sniffing in the field. I'm fairly well equipped for 2.4GHz wi-fi interference, but not for HF. Most cable-related problems will show up on a certification tester such as the Fluke DTX CableAnalyzer (the one we use). Others can be isolated with a spectrum analyzer in conjunction with a (actually, several) directional antenna(s). Portable spectrum analyzers are pretty easy to carry around. If you're in this as a business, both of the above are a necessity for proper installation. It seldom takes us more than an hour to find RFI problems, and most can be done in 10-15 minutes. It never takes us days, even in large installations. Impressive. I assume those are continuously generating RFI sources, not sources that appear intermittently or drift all over the place as they warm up. I spent about a month chasing down a noise source that turned out to be the 24v battery charger on a diesel generator. Some grid tied solar controllers seem to be problems and take some time to find because they can be miles away. Fortunately, they're usually easily fixed with the manufacturers optional filter kit. It took me about a week to determine that my weather station was the source of some 20 meter trash. The problem was that it only generated noise when running on the internal backup battery, and not on AC power. The ones that disappear when the AC power is temporarily turned off are usually quite easy. The one's that don't take me much longer to find. Not at all impressive. We have the right equipment to locate problems. But then our customers don't expect us to chase down 24v battery chargers on diesel generators. We chase down stuff in our equipment; if it isn't our stuff we will track it down for them - but we charge by the hour (and it's a rather hefty charge). -- ================== Remove the "x" from my email address Jerry Stuckle JDS Computer Training Corp. ================== |
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