At 02:31 PM 11/25/2003 -0500, va3pl@cuic.ca wrote: How do you calculate forces in guy wires? Here is scenario: Tower 80 feet high Two Antennas spaced 10 feet totaling 25 sq feet (bottom 15 top 10 sq
At 12:06 PM 11/25/2003 -0800, Jim Lux wrote: At 02:31 PM 11/25/2003 -0500, va3pl@cuic.ca wrote: How do you calculate forces in guy wires? Here is scenario: Tower 80 feet high Two Antennas spaced 10 f
Something to contemplate, in line with the comment about whether a kilobuck is appropriate for a high power tuner... The tuner's a pretty important part of the "system". If you've spent $3K on the ri
steppers nature. But selsyns don't do multiple turn counting.. Maybe with some sort of gearing they would, (i.e. 1 turn of selsyn = many turns of cap or inductor). For a conventional 1/2 turn cap the
Indeed, this is exactly what I was talking about... it's basically a CLC pi network. The LDG is very similar internally, except that they use a L network, and switch the C from one end to the other d
I suspect that if one were to search through the patent literature, one would find that many, many designs that are in common use by hams are actually patented. And, as Paul points out, many of them
At 10:29 AM 12/2/2003 -1000, Jim Reid wrote: <snip> The XMatch series capacitor which is switched to be in series with either the tuner input or output connector is a "bank" of doorknob type capacito
At 01:46 PM 12/2/2003 -0800, Jeff Stai WK6I wrote: hi Jim and group - I finally got an answer back on pricing for that ACOM 03AT tuner - and I quote: Hello Jeff, thank you for your request. ... The 0
This is an ideal application for a quick and dirty antenna model using any one of the versions of NEC out there (several nice ones are free: 4nec2 is my favorite, but there are others). You don't nee
I think we can all agree that lots of patents are issued that may not be ideal I think we can all agree that lots of "obvious" stuff has had a patent issued, and never been tested in court, because m
http://www.shrinktape.com/ ??? This stuff is polyester Generically, heat shrink is irradiated polyolefin, so searching for that may be more productive. There's some really burly stuff used for fixing
At 07:39 PM 12/8/2003 -0600, Mark Brown wrote: Hi All I have a new neighbor who has horses and put up an electric fence. It is giving off an s9+ pulse on the lower bands and is hearable on 2m ssb whe
No solvents, really, since what you are looking at is corrosion/oxidation (copper oxide is black or red, depending on the form). Various forms of "bright dip" are available... usually consisting of s
Probably, more accurately, it would be the responsibility of the "operator" of the interfering device (i.e. the entity that has control over whether it is on or off). Who owns the source of the inter
At 10:40 AM 12/10/2003 -0600, EDM1 wrote: I am also looking for a Winch. My application is raising and lowering a 40 Foot Rohn 25 with a hinged base (The kind with the hinge base sitting on the groun
At 02:43 PM 12/11/2003 -0800, Alan C. Zack wrote: I wonder if anyone would be kind enough to please point me in the right direction to find the method of obtaining a Wind CALC (calculation) for a tow
It may not even be possible to have any antenna area at 90.. The allowed cross sectional area is dropping faster than windspeed squared.. There's something else at work than simple canteliever loads
Jim raises a very significant point. There is a definite trend in industry towards "commodity" products and away from "craft built" products. Consider the immense amount of useful computational power
And I realized that making antennas is one of those craft industries that is probably going to stay local.. and for which homebuilding is comparable to commercial, but cheaper, and likely to stay tha
Certainly, there are "radio specific" panels aimed at the ham and radio market in general. Another approach is to use one of the panels made for bringing in telephone lines. They mount in between sta