Most any structural shape you care to name is available as "pultruded" fiberglass reinforced plastic. A notable tradename is Extren. Lots of grades for various purposes. Structurally, think of it as
SO what does one of these nifty pole replacements cost? They say the cost is comparable to a steel tower of comparable strength, etc.. However, not having ever bought a brand new telephone pole, that
A vacuum cleaner at the receiving end also works well, particularly if you have one of those "carpet steam cleaners", which tend to have higher suction. Thought I would pass this along as it worked v
You typically need some sort of "mouse" at the end (a wadded up rag, or a big clunky knot) use less _______________________________________________ See: http://www.mscomputer.com for "Self Supporting
I'd argue that phrases like "please copy" and leading zeros are designed to standardize the form of the communication, much as prosigns do in CW or headers in digital comm do. The "please copy" lets
Fish tapes are limited in length, and, from experience, pulling a rope through is much easier. Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman
Roof flashing is what you're looking for. If you need it "real cheap" find folks who are doing copper flashing gutter jobs, and look for offcuts. Copper sheet is also commonly used in various and sun
in with This would be normal for an LCD display. They're pretty temperature picky, unless you've bought a real high dollar unit. Bear in mind that those colored temperature displays on fishtanks are
At 09:39 AM 11/21/2003 -0500, Martin Ewing AA6E wrote: K9OM asks: Has anyone experimented with feeding both a horizontally polarized and vertically polarized antenna simultaneously on HF? Such as, fe
This was extensively investigated in the 1930's through the 1950's. I believe the BBC and British Defense engineering staffs did a lot of the work since they of farflung empire "over which the F-laye
At 07:57 PM 11/21/2003 -0500, Joe Subich, K4IK wrote: Get off your high horse. In a series circuit, which a loading coil most certainly is, the current into and the current out of a device must be th
For those of you thrashing out the issue of parasitic C, and applying circuit theory to loaded antennas, I've run some calculations on typical loading coils. I've used the Wheeler approximations for
For closewound coils, with length to diameter ratios around 5:1, a series of fairly careful measurements have been made with the coils arranged vertically above a ground plane, fed at the base, with
Interesting writeup, however, I'm not too sure about your statement: "In as much as a the receiving station benefits from diversity receiving antennas, the transmitting station reciprocally benefits
I don't know that Method of Moments codes (i.e. NEC) adequately model parasitic capacitance effects, which are proabably important in loading coils). No question that using a GH (helix) to model the
An admirable construction approach. Your limited size elements are also not so much shorter than full sized elements that the mutual coupling between them is pretty much the same as the modeling tool
I don't know about TA, but HFTA, in the latest ARRL antenna book, says that it only handles horizontally polarized antennas, which makes me think that it doesn't deal with polarization at all, but j
Fascinating question in it's implications. If the atmospheric noise (which, particularly at night, might not be the dominant source) were uniformly distributed (source direction/polarization) then th
Max Gain Systems, Inc. sells 8 ft of 5/16" inch fiberglass rod for $4.50 http://www.mgs4u.com/fiberg.htm I'll bet shipping costs more than the rod. At 04:08 PM 11/24/2003 -0800, Carl wrote: I am erec
one and Generally neither, because a quarter wavelength of coax won't create a 90 degree phase shift unless it just happens to be terminated in it's characteristic impedance (which no antenna, partic