My DTV antenna cable has an external ground wire that is broken off about 8 feet from the dish and not grounded to the converter box. Question, for TVI (not worried about lightning around here) shoul
It is my understanding that the National Electric Code requires that your satellite dish be connected to the same ground as your power company's and telephone company's grounds and to your ham radio
Yes. The NEC was written by very good engineers, and has included input from some with excellent background in audio, video, and RF. I haven't found anything in NEC that is in conflict with good engi
Receive communications equipment and antenna grounding is covered in NEC Sec. 810. In fact, few licensed amateurs realize that the NEC has a sub-section devoted to amateur radio station operations/g
Paul, It looks as if the NEC is here concerned not with electrical characteristics, but with mechanical ones. Cortland KA5S Tx the NEC _______________________________________________ RFI mailing list
It may be related to both mechanical and electrical safety concerns since the NEC (Sec. 810) dictates wire size irrespective of RF power level -- and that the specified gauges are adequate for maxim
All of my antennas but one meet their criteria and that is a 75 meter dipole being fed the legal limit less coax loss. It's #16 copper clad steel and even with no more loss than 75' of LMR600 and 30'
I'm going to relate this story, because, it underscores the need for a 'static-electricity drain path' to earth; the NEC may be seeking in their usual round-about way to provide this, albeit without
Why are you beating up on NEC? It's a very good safety code. It is not a textbook. You want to learn how things work and why the code is written the way it is, you study a textbook. 73, Jim K9YC ____
Cumulus in the area are not even necessary: Blowing dust, snow, rain and sometimes just wind can produce enough static charge to do this. I had a 1/4 wave vertical on 40 that was direct fed with coax
Just two points in response, Jim: a) I have endeavored to learn the reason why the NEC 'calls out' certain specific methods and have decidely not found the underlying rationale solely based in the 't
One reference is the tutorial cited below. While it's written for sound and video contractors, the fundamentals apply to hams. http://audiosystemsgroup.com/SurgeXPowerGround.pdf It all comes down to
Although it's usually phrased this way, it's pretty much impossible to have an entire building rise to the same potential at the same times due to the dV/dT (rise and fall) for lightning strikes, BUT
Exactly right. All of those interconnections have inductance and resistance, lightning will be closer to one point in the building than others. In addition, there's voltage and current magnetically i
Just two points in response, Jim: a) I have endeavored to learn the reason why the NEC 'calls out' certain specific methods and have decidely not found the underlying rationale solely based in the 't
Jim, first of all, thank you for your response. You are a valuable asset on the list. I would also stress that there is one more reason for 'grounding' of equipment, esp. anything that has exposure t
Jim (and Jim!) Some years ago, when I was working in the telecom industry, I ascribed a number of puzzling protector failures to such slowly moving charges. Given the extent of telco outside plant, a