Sure, there are truck mounted augers that can bore a lot deeper than 25'... The cave in issue is mostly for the upper layers of soil. Once you get down very deep, the soil tends to be more like "soft
Without knowing anything about Dave's soil, I'd make the following comments: - 3 holes 20 feet deep 3 feet in diameter is a LOT more than 1 hole 25 feet deep 2 feet in diameter (about 5 times the vol
The older (2000 time frame) Radio Shack FRS radios (with the dip switch internally to set the channel) have a fairly standard dual jack for a headset. I can't recall off hand whether it matches Yaesu
Call places that deal with horse trailers and big fifth-wheel types. Truck stops (and stores catering to tractor-semitrailer rigs) will also have the bigger connectors. They need the extra wires for
At 11:11 AM 10/20/2003 -0400, Roger D Johnson wrote: After posting my previous message, I decided to do some research to determine the strength of the SS hardware I used on my tower. It turned out to
At 02:05 PM 10/20/2003 -0400, tongaloa wrote: corneliuspaul@gmx.net wrote: VE6WZ wrote: Put both elements back pointing the same direction. Shorten all the elements on the 20 the same amount to bring
At 03:23 PM 10/20/2003 -0400, Pete Smith wrote: A I have tried to model the situation with NEC2 but had no succes in making a workable model (too many segments) I think your concerns are fully justif
Hard to imagine a scenario where that would happen. It would require that the IR losses in the joint be high enough to melt the braze material. By the way, I'm not sure what you really want here is a
...uh, "issue?" This one got away before I finished typing. I hate it when that Mark, N5OT Indeed, it's more of a surface area in contact with the soil than a depth of penetration issue. Burying the
At 12:55 PM 10/21/2003 -0400, Tony King - W4ZT wrote: At 12:38 PM 10/21/2003, Jim Lux wrote: <snip> By the way, I'm not sure what you really want here is a brazed copper/copper joint. Brazing is usua
This is a non trivial calculation, for a variety of reasons. NBS Circular 74, published more than 50 years ago, will have some formulae. The "tome" in this field is a work by Grover... Some of it is
What about a spring? Presumably this is for a fairly big antenna, so a few feet of spring with the antenna wire looped in parallel won't change the electrical properties much. If you want to keep the
Doh, must be early in the morning... You could put the spring loaded cord reel on the far end of the L, assuming you've transitioned from the wire to a nonconducting guy. Then it would be coiling the
The velocity factor is primarily a function of the dielectric material, which doesn't change from physical configuration. There is a small effect from the ratio of L and C (which determines the nomin
Pshaw on those feeble tower mounted arrays... What you want is a full on OTH HF radar array, or a Wullenweber, depending on whether Tx or Rx is your pleasure... <grin> for that matter, HAARP can do m
The early moonbounce work was done with large dishes. put other Maybe, maybe not... It is a research tool, after all, not a operational facility. It might just be a matter of applying for some operat
Bear in mind that when you remote control something that you cannot see, you need to have some basic safety precautions in place, like interlocks and position feedback. A friend has a crank up tower
backyard. Yes Im getting down) Yes... if vertical, the main lobe (and the fields that create it) are mostly oriented upwards.. Ideally, though, you'd want to have it a ways above the ground, and make
At 04:17 PM 11/4/2003 -0500, Mel Martin wrote: I'm not sure that's necessary... they could use a Hi-Q loading coil... this would work well since bandwith isn't the issue it is with a more conventiona
For all the "cool factor" of elements that change length, it's interesting to contemplate how is this different than, say, using a fixed length radiator and changing a low loss loading element. Consi