There are some loops that can function without a ground, such as a flag or pendant. The K9AY requires a ground. It won't work without it. Each of its loops functions basically as two phased verticals
Don't take that antenna down just yet. It is much more likely that the problem is on the ground. First some basic operational details that may help you understand possible causes. Maybe if I give you
One minor correction to what I just wrote. Each element requires 4 wires, not 2, but they when they are measured from the controller end they will appear as 2 independent loads. Jerry _______________
When those controllers were returned did they test good, or were they blown? I asked him to do ohmmeter measurements to eliminated direct shorts and remove all extraneous devices from the lines. If h
Tom, I can answer a few of those questions. -- The obvious thing is a wiring error you don't know about, but let's assume it is all OK. I'm also assuming several others have very similar setups witho
Yes, that is exactly how it works. It does have a recalibrate function which drives the elements back into the housing and oversteps the pulses so that it is now sure where the antenna is. Jerry ____
An interesting observation. One can easily make the mistake of saying that the current to the motor is regulated so the supply current doesn't change due to the extra resistance, because the motor cu
The question of the power supply's average current capability requires further investigation since this is the most logical cause of the problem. This would exactly explain the symptoms reported. The
A test with a larger wire may work or not depending on the source of the problem. If the problem is due to IR drop, then the larger wire may fix it. If the problem is due to capacitance on the cable,
Apparently you didn't read my explanation, in answer to WC1M's question about how this works. Here it is again. An interesting observation. One can easily make the mistake of saying that the current
Your concerns are well justified and I agree with them. The H bridge driver used is an L6219DS, which is intended for a closed system. As far as I know, the schematic is not available. Jerry ________
Best suggestion I have heard lately. I certainly wouldn't recommend the user go change his cable when the factory doesn't know the maximum limits for the cable. Jerry ________________________________
You have almost got it, but you didn't list the other corollaries. One is: if the amplitude of the current pulse is held constant and length of time for the current pulse increases, the average curre
...."One thing that bothers me about this is that this doesn't guarantee that the Z at the feedpoint is actually 50 j0."... Who cares? The whole point of doing the adjustment was to get a better matc
RF current meters are good tools. Real handy for phased arrays and debugging misc antenna problems. I just recently built one, since I had this very nice 50 uA meter that needed a home. I took the si
Thanks for the reply Ian. Yes, this makes sense. I guess I wasn't thinking too clearly when building this, however I did test some of the large ferrite split beads to see what they did to the circuit
Here is some additional information on the RF current meter I made. This was prompted by GM3SEK's comment about core loss. His comments were correct, so that prompted me to go back and see why my mea
Sounds like the molten metal is running out the holes around the wires or around the ground rod if it doesn't fit tightly. You can pack it with sand to prevent this. The trenching can be difficult if
Doing engineering analysis from where I am sitting is very difficult, and you are down to that point. The part substitution method hasn't worked and there is only one part left that hasn't been subst