Tom, 7z should be installed in C:\microdem\7zip\ What type of DEM are you trying to load and what are you trying to use MicroDEM for -- HFTA? Steve, W3AHL Does anybody on the list know what I can do
http://www.tlcelectronics.com/jst/ELP-06V http://www.tlcelectronics.com/jst/SLM-41T-P1-3E In stock for a total of $0.72 for the housing and 6 pins + shipping! Or gigaparts.com has them for $10!! Stev
Parallel multi-band dipoles require some attention to detail during construction and tuning, but they certainly are a good solution for many sites. I have hosted several antenna building parties for
I think thats what I mentioned also.... It all depends on how your antenna can be sited in relation to the areas of interest, which is one of the things we go over in an overview document that helps
I live near Wilson, but in another county in NC, where they wont even consider a permit based upon the condition that a tower would be retracted during a storm. My solution to the problem was to moun
Rob, As an upper limit, the voltage on the ends of the DE should be about 3700 volts RMS or 5200 volts peak. This is based upon a 40M wire Yagi EZNEC model with a source power of 1500 watts, feed poi
Jim, Since EZNEC modeled currents are based upon all induced currents from other elements, the estimate should be at least as useful as previous replies of high or so high you dont want to know. The
Rob, Since I needed to retune a portable 75M dipole, I took advantage of the opportunity to measure the voltage at the end. I also modeled the dipole in EZNEC, duplicating the as-installed configurat
A similar question was posed a few months ago and I compared the actual measured voltage on the end of a dipole to that measured by EZNEC using a zero amp Source placed very near the end segment of a
The data supplied by Champion Radios web site is too out of date to use for any tower planning purposes, since it is based upon TIA-222-E, not G. Your best source of info is your county building perm
The Polyphaser document is: Lightning Protection & Grounding Solutions for Communication Sites by Ken Rand, copyright 2000. There is no mention of the maximum distance of ground rods from a tower. Ho
Placing the first rod 16 ft from the tower adds significant impedance of the wire radial to the first major earth current sink. Most towers that I have seen place the first rod at less than 5 ft from
Based upon an EZNEC model of a 102 doublet in free space and varying the copper wire size, the efficiency and loss in dB for #20 wire is 97.1% with 0.13 dB loss, #24 is 95.4% with 0.2 dB loss, #28 is
Kelly, I suggest you buy or borrow a copy of ON4UNs Low-Band DXing, 5th edition book from ARRL and look at Chapter 9, section 6.9, starting on page 9-62. At the end of that section they discuss model
Ive used Essex Allex (Heavy build). A general datasheet is at:https://essexwire.com/sites/essexwire.com/files/2017-08/Essex-Wire-Datasheet-Allex-EN.pdf Dielectric breakdown for 18awg is 4,275 volts m
Heres a source for several styles, starting at $57 (first 3 listings) https://www.zieglerbolt.com/jam-nuts-2#/sFilters=33!14339;14!11008 Steve, W3AHL I have a chain drive for my big rotating tower th