Gentlemen, I'm doing some reasearch for an applications note I'm preparing on power and grounding for audio and video systems, and wanted to mention the use of a Ufer as a ground electrode. This got
I agree that there are probably switching supplies causing the problem, but I wouldn't give up on fixing the problem without trying. There are three basic ways the RF can get out -- on the power line
I have spent a fair number of hours with a CIA-HF, borrowed from another ham, and own an MFJ-259B that I've calibrated per Tom Rauch's applications note. Tom says that the concepts of the two analyze
Not always, and not always reliably. Also, there are timing issues associated with USB to serial that can cause certain software not to work with them at all. A Belkin unit borrowed from KK9H to try
I agree with your assessment. In general, you will achieve higher R over the broadest frequency range in the HF spectrum with #31 than with 43, 44, 77, or 78. You can "tune" the peak attenuation by v
The narrower bandwidth of arrays has to do with geometry (spacing, azimuth, elevation) and phase relationships between the drive to the elements. I wouldn't expect fattening the conductors to have MU
It's very good stuff, optimized for very low loss at UHF. NOT very flexible -- this is for permanent install where it won't move. Solid copper center (#10 if I recall correctly), braid plus foil shie
Here's a link to a paper I just finished on Power and Grounding for Audio and Audio/Video systems. While some of the material is specific to the needs of those systems, much of it is generic and appl
Yes. One thing that distresses me a lot is seeing so many morbidly overweight guys riding around hamfests in motorized carts/ bikes, etc. because they're too out of shape to walk. And, of course, the
Rich said he already did that -- see below. Rich also said he made many phone calls that were never returned. So if we accept his story at face value, he did his best. I don't know Rich or Steve. May
A year or two ago, I bought a 1,000 ft spool of RG6 direct from Commscope. As I recall, it was about $110, including shipping from NC to Chicago. What I bought was some very good quad-shield stuff fo
Plasmas are well known to generate SERIOUS trash in the ham bands. They are also prone to burn-in. Jim K9YC _______________________________________________ See: http://www.mscomputer.com for "Self Su
Unless I'm missing something, the primary issue with braid coverage is leakage at VHF and UHF. Example: you've got an MATV or CATV system -- when operating close to VHF and UHF transmitters, you don'
I've had a DirectTV dish for at least 5 years, no problems at all. I'm in a Chicago residential neighborhood that is relatively densely populated -- houses on either side of me are 20 ft from my hous
It's all part of fooling ourselves about the basic physics. The impedance of a conductor at RF is FAR more dependent on its INDUCTANCE than upon its resistance. So the only value of that "beefy" wire
Huh? Could you please explain exactly why? A circuit diagram might help. Jim _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Wea
You were experiencing a "pin 1 problem," probably in both the computer and the radio. Nearly all computer sound cards are built with pin 1 problems, and so are nearly all ham rigs. The correct connec
YES. (All caps for emphasis) In a home, YES. In a building where there may be a transformer to establish a new system, the NEW neutral must be bonded to ground close to that transformer.AND all groun
I think you mean it uses the shield as the signal return for the mic. The answer is that still connect the shield to the chassis. At audio frequencies, the circuit board will be at ground potential u
itself is usually floating within the housing. That's not necessarily a bad thing -- IF there are two wires connecting the mic element to the transceiver, one going to the "so-called audio ground," a