It comes on the CD with the ARRL Antenna Book, 20th edition. The book itself contains a very detailed explanation of what HFTA is all about. You will also need terrain height data along radial lines
It's also a very good day to talk about finding true east and true west. -- 73 from Ian GM3SEK _______________________________________________ _______________________________________________ TowerTa
Another thing that "goes without saying" is not to grease the pawl sprocket on the K1550, or even anywhere close. The friction discs press on both sides of that sprocket, and there's too much risk of
Yet another way... I made up radials in sets of 8, twisted together and crimped into a single terminal lug. The crimp connection is totally sealed against corrosion, by a combination of solder, hot-m
Several years ago, we had a brainstorming session on this problem for my 'In Practice' column. There were various suggestions involving weights, dual-diameter drums etc. The wackiest idea was to have
Drill a pilot hole using an SDS+ electric hammer drill and a 1.0 metre long carbide-tipped drill bit of the same diameter as the rod. You don't need a huge heavy drill - it's the hammer action that d
Another place to look for the EBM Papst data sheet is http://.uk.farnell.com (an affiliate of Newark). Oh... see what you mean... no electrical data and no performance data either. Completely useless
Helluva story, Carl! (It must really focus the mind to know that, one way or another, you were going to leave that ship by catapult. ) But Jim made two separate points there: the % shield; and also t
Hasn't it just? Good to see you back. Well, that's curiouser and curiouser! I guess we've about beaten this to death, since we don't know anything about the victim equipment either. Coming back to th
It is important to terminate the secondary winding with a low-value resistor. If you do, then even an RFI suppression bead will act as a transformer with a very low insertion impedance in the main li
The above is all true, but it seems to be missing the point. Paraphrasing Lawson, the important point is: The assumption of symmetry in a simplified model will guarantee that the modeler will NEVER s
Absolutely! We shouldn't be exporting Scotch to any place that uses three-digit thermometers. Back on topic, there have been several different kinds of self-amalgamating tape over the years. The very
Capacitance between turns always exists, which is what creates the large peak in common-mode impedance at resonance. This is particularly desirable for a monoband antenna because the peak can be plac
That can easily happen, as the equivalent lumped capacitance is only a few pF so the resonant frequency is extremely sensitive to small variations in strays. Even a twisted-wire 'gimmick' capacitor c
wrote: "Teflon" is a trade name, and can be used however its owners wish. When PTFE was first invented, both names meant the same thing. But DuPont have since developed a much wider range of related
Nice one :-) The total amount of noise from a Ham-x will depend more than anything on the way the operator uses it. A single sequence of "click... whir... click" is nothing to object to, even if it's
The connector will probably be re-used in exactly the same way, so any residue of hot-melt glue will be a help in the next life. However, heat shrink tubing generally doesn't contain enough glue to g
Blue Loctite is excellent for many antenna jobs. It lubricates as you tighten the threads (prevents galling of stainless steel), locks the threads together so they won't vibrate loose, and seals them
Haven't tried that myself, because as Carl says, there sometimes isn't enough meat around the existing hole to allow a big increase in hole size. I like the idea of the permanent stainless steel stud
I believe this range is colored red. Green Blue. There's also an even weaker pink range for use with very tiny screws. You're right, Jim, I should have been more specific. The grade I use routinely f