This is an area of great interest to me, both professionally and as an amateur in a fairly rigidly controlled HOA. In fact, I think that adaptive antennae and phased arrays are a reasonably practical
One could try: http://www.sciamarchive.org/qpdf.cfm?ArticleID_CHAR=99A6D76A-0BE8-1A0D-6A6FA186CAD0B469 which might work (I haven't tried it from a variety of IPs, and it might be IP address or sessio
Or, one could run a 10 kW "active antenna tuner", on each of the 10 elements in the array. While the current regulatory model lets me have 1500 joules/second, I can't exactly distribute them as I see
or losses in antenna tuners, etc. Actually, for that matter, I think the FCC is a bit vague on where the reference plane for the power limit is. Say I have a 5 kW amplifier, and I'm using some sort o
_________________________________________________________ The FCC is not vague at all. Here's a quote from Part 97: §97.313 Transmitter power standards. <snip> (b) No station may transmit with a
Not at all... RMS volts times RMS current will give you apparent power which is the vector sum of real and reactive power (that is, apparent power = sqrt (real power^2+reactive power^2)... Chuck is u
There's been a lot of real interesting discussion here, both on and off list. My questions about measuring power have a real basis in the context of fairly sophisticated phased array designs where th
rule available. but Well, HAARP is a bit bigger installation than I would contemplate..Furthermore, it's built to standards well beyond what any ham would be willing to pay for and has capability wel
(particularly with respect to nonlinearities and differing distortion products from each amp) is a challenge. It's a challenge today with any amplifier that uses multiple amplifying components, which
There are Type N (and others) connectors made for wide temperature swings that have the center contact captured. Among others, W.L. Gore makes them (although I don't know if they sell the connectors,
For a "expedient mast", why not some lengths of iron pipe? Sure, it's heavy, but you don't have any particular need for portability and collapsibility, do you? 50 feet of 2" or 3" (or stepped sizes)
Depends on the environment and the use to which you're going to put it.... Here's the theory behind pressurizing: If you don't pressurize it, then as the temperature and barometric pressure change, o
Indeed, for hand excavation, some of the hole designs seem a bit weird. However, deep but small diameter holes are a very common form for concrete piers, where the expectation is that someone erectin
Just checked on the web for local places that actually have prices for drilling (big) holes... looks like 150-200/hr is the going price for the auger rigs (and that includes the operator).. roughly t
probably a reflection of increasing building code requirements for things like seismic loads, wind loads, etc. Over the past 20-30 years there has been a gradual shift in building codes from establis
HamLaw certainly is active... I get several posts a week, although not much in the last few weeks (maybe everyone's on vacation resting up for the first Monday in October?) Do the zoning laws in ques
At 11:44 AM 9/9/2003 -0500, Jim Rhodes wrote: Ok, Strike #1 off of your list if you use these. They are no more weather proof than a UHF connector. Nonsense... N connectors have gaskets (if properly
N, and the much smaller spacing from the conductor to ground can handle more current and voltage than the larger pin and larger spacing of the UHF connector. experience and the experience of many oth
.As far as power handling,my 800 watt out you Just because it has a SO-239 doesn't mean that that's the best connector.. it just means that it's a market accepted standard. If I were marketing anythi
What test gear do you have available? How much cut and try are you willing to do, and do you have some convenient beacons/sources to test with to measure F/B (for instance) There's sort of two genera