When these yagi comparison test results were first announced ( I think I remember the talk at Dayton several years ago) it really got me thinking - IS IT POSSIBLE that there could be an antenna model
Is there any Pete, If you put dc on them, with a series resistor to limit the current to about 1 ma you will see the breakdown voltage. I have done this many times, and used MOVs on rotor control lin
-- None. As long as you just change just the driven element length. The gain is quite broad (very little change clear across the 20 meter band.). The f/b is much sharper with frequency. I have the el
There is a SteppIR group on yahoo that you might also want to post the question to. Several nice, knowledgeable folks there as well. _________________________________________________________________
Probably a zapped driver chip on the driver board in the controller. I had this exact problem this week. You can get chips from Mouser for about $2.25. Rick K2XT _____________________________________
did you It's one antenna vs two. The boom is only 2 ft longer than the HyGain. Yes the elements are full size on 20, so a little more torque compared to the TH3 but you don't have the other dipole, s
Nice work Jerry. I don't completely understand all, but it sounds to me as if you are saying something like the lines (i.e. pins 1-2, and 3-4 going to the driven element) are balanced. Meaning no cu
Dick - Your scenario sounds plausible to me. From the standpoint of MOVs. You have 82 v MOVs at the base of the tower and at the shack on a good ground. Fine. Your tower takes a hit and a portion of
I had a Gem quad in 1974. My first directional antenna and first tower. The tower was a fairly light duty crank-up, 5 sections, 88 ft guyed. So what to do with that quad which extends down 10 ft or s
A big advantage is that it is a much better match to an open-wire feeder. This means there will be far less impedance changes vs feedline length or frequency change. So the impedance you get at the
-- The pattern is largely influenced by the height above ground. I used a model of a 20 meter beam, and changed the frequency to 18 MHz and the pattern is essentially the same as a dipole gives. At
Ask yourself this, "How do I know it works quite well? Could it possibly have 3,4,5 db of excess loss and how would I know?" In fact, next time you are on the air and someone tells you your antenna i
Steve, It looks to me like this will give you 10.5 dbi gain, 14 db f/b at an angle above the horizon of 30 degrees. Using #12 wire. reflector length - 10.6 meter driven ele length - 10.0 m spacing 3.
I replied to him off list as he requested, and suggested the yahoo group, SteppIR. It is pretty active and I think I saw this question addressed there recently. ______________________________________
I'm seeing a lot of this lately. Posters seem to think if they put OT in the subject it is ok to post anything. They have a captive audience of experts with good, common sense, and feel it's ok to t
how do I check out the unit to know if its You take a power supply that puts out 800-1000 volts, put a very large resistor in series with a microampmeter, and attach it to the output coax connector (
Caution: Hornets nest in tower, not visible behind flux capacitor. _________________________________________________________________ The New Busy is not the old busy. Search, chat and e-mail from you
Consider using a 500k resistor instead of a choke. What either the resistor or a choke will do is prevent devices you have on the shack end of the line from seeing the static charge. i.e. your gas tu
I've noticed whenever someone is talking about his antenna, ANY antenna, he always is pleased with it's performance. Maybe due to the fact that others give him good signal reports. i.e. Over and over
Fred, unless you have it around 120 feet high (half wavelength) it won't show much directivity, so it won't matter where it's pointed. But if it is that high, it will be strongest broadside to the a