I think all you guys have the concept down correctly, but this term "single point ground" has always been a major point of confusion. It is a terrible misnomer. I actually refuse to use it. Instead I
That wasn't me, but it's just another illustration of how misleading the SPG term can be. Many people were on the steep part of the learning curve around the time TTL and then Schottky logic appeared
Well I guess if no one else is going to say it, I will. The reason your balun got hot is because you put in in series with your signal not in series with common mode currents. You can't put a balun o
HFTA gives incorrect gain for yagis stacked that close. The manual has a warning about yagis spaced closer than 1/2 wavelength. Jerry, K4SAV _______________________________________________ __________
That water tower is going to be a major player in determining how any kind of vertical or sloping antenna is going to work. Without some very detailed analysis or measurements, anything you do is goi
These antennas aren't even in the same class. The 4 element SteppIR is the hands-down winner in all catagories except the price. Look closely at those gain specs for the X7. They are for the antenna
..."I think that the difference between dbd and dbi is 2.1db."... True, and the difference between the free space gain, and the gain of a three element yagi at one wavelength height, is approximately
For some free software to make these calculations go to http://www.arrl.org/qexfiles/ and download the file labled TRANVITY.ZIP. Also download the following pdf file. http://www.arrl.org/qex/1123.pdf
I think one of the advantages/disadvantages should be immediately obvious, you need an 80 ft plus tower to put up a 40 meter half wave vertical dipole. If you do put it on a tower, it will no longer
You have a 66 foot tree (or wooden mast) from which you can properly hang a vertical dipole.".... A 66 wooden pole wouldn't do it, the bottom of the wire would be touching the ground. You could make
If you are thinking phased verticals, yes this is doable in a variety of ways. I hope you are not thinking two element Yagi. A two element 80 meter Yagi is a very large undertaking mechanically. Take
..."There's an English NEC manual at http://www.nec2.org/. And, I'm pretty sure that 4nec2 has an English NEC manual file included in the distribution. The help file is certainly in English. It's fai
Sounds like it's time to check the calibration of your MFJ-835. Assuming an imbalance, reversing the polarity of the output terminals should simply show the same reading but on opposite channels. Rev
I agree with your conclusions Dan, and with your first explanation. Since you got me on that one, just for the sake of argument, I will pick on your last statement. ..."I think the meter is fine. The
Both of these parameters require some consideration when modeling stacks in HFTA. Since HFTA does not model mutual coupling between antennas, close spacing (less than 1/2 wavelength) produces optimis
Lightning protection for a dipole fed with ladderline (also called window line, or window line sold under the name Ladderline) is somewhat problematic if it takes a direct hit. The problem is that if
W2IRT asked: Questions: 1) How far below ground should I run these wires? I'm just using hand-tools to trench, not a ditch-witch, so the plan was about 3 or 4 inches. You can get a little help from c
This doesn't answer your question, but maybe it will be of some use. Last time I was at Ameritron I noticed some small relays they were using on many of the RF amp boards to switch RF, and I got the
Just bury a few strips of copper flashing just under the surface. All you need for a K9AY loop is about 200 ohms ground resistance. Jerry, K4SAV _______________________________________________ ______