I know this is a scenario of diminishing returns...how many skin depths does one shoot for? That's an interesting question. It has to do with the fraction of current in the "skin". If you've got 5
John KK9A Skin depth in copper at 4 MHz is 1.3 mils, 32 microns. skin depth calculator at microwaves101.com I used 1.62 as the resistivity of copper. https://www.microwaves101.com/calculators/869-ski
I've used the propane torch soldering tip attachment. They are quite large for small, "tight" spaces like on a 'Jones connector. Even worse is the flame/heat that shoots out from the side holes that
I am familiar with Hoffman enclosures, however I might want to place a mini-PC/Raspberry Pi (for wireless antenna switching) or even a QRO remote antenna tuner along with several stack matches in the
On 10/3/22 6:42 AM, Grant Saviers wrote: Not at the tower base, but I use a 42h x36w x18d office supplies cabinet, 2 doors for my entrance j-box. I bought the welded up one. 3x 3" + 3x 2" bottom and
Same question, but ant is not full size, and may have various forms of loading schemes used. (Say 50-80%) of full size. Ok, what about a single, full size 1/4 wave vertical ? Or a loaded vertical ? I
On 10/4/22 8:30 AM, Lux, Jim wrote: On 10/4/22 8:07 AM, jim.thom jim.thom@telus.net wrote: Ok, simple question. With 1.5 kw (measured at feedpoint) applied to the 50 ohm input of the (full sized)
In theory (!) all the power would have been radiated by the time you get to the tip - so zero voltage. However the real case is very complex and depends on the environment and therefore the actual im
yes.. The power radiated is related to the current, and since the current is highest at the feedpoint (for a half wave dipole) that's the part that radiates the most. That's why shortened antennas wi
You might look at this approach. While a bit theoretical, the concept seems sound. https://www.witpress.com/Secure/elibrary/papers/BE99/BE99016FU.pd <https://www.witpress.com/Secure/elibrary/papers/
Is this no longer a thing? Kurt The picture is probably an example as a teaching aid. In real life, the meter (and the leads) would affect the currents and voltages in the antenna, since the antenna
On 10/4/22 11:28 PM, Jim Brown wrote: On 10/4/2022 10:30 PM, KD7JYK DM09 wrote: I may be crazy here, but, am I the only one that remembers using, and all the drawings in all the books of using, a met
https://hamwaves.com/zc.square/en/ Running this gives a value of about 115 ohms. The fact that it is aluminum doesn't affect Zo it would affect the loss, but not Zo. There might be some sort of weir
Is there a similar calculator for "angle" conductors - e.g. the "half a square" conductors used in some commercial antennas? Viewed from one end, they might be an 1/2" or 3/4" "L" with the top/bottom
It's a fair ways from yield (fy) to failure (fu) for steel. I don't know the alloy here, but looking over a table, it looks like fu is 10% higher than fy for most of the "high strength" steels. EHS
73, Pete N4ZR Check out the new Reverse Beacon Network web server at<https://reversebeacon.net>. For spots, please use your favorite "retail" DX cluster. On 10/20/2022 1:43 PM, Edward McCann wrote: I
73, Pete N4ZR Check out the new Reverse Beacon Network web server at<https://reversebeacon.net>. For spots, please use your favorite "retail" DX cluster. On 10/20/2022 1:43 PM, Edward McCann wrote: I
https://www.energy.gov/sites/default/files/2022-05/Fastener-Headmark-List-2022.pdf https://www.standards.doe.gov/standards-documents/1200/1221-bhdbk-2016/@@images/file On Fri, Nov 11, 2022 at 5:12 AM
On 11/11/22 12:24 PM, Mike Lyon wrote: If I was a coding geek, it would be cool to take 2x, highly accurate, GPS receivers, place one GPS antenna on the front and back booms of the beam and then diff
On 11/17/22 9:51 PM, KD7JYK DM09 wrote: On 11/17/2022 18:33, Hans Hammarquist via TowerTalk wrote: I used the same type as the utility companies. They are a lot cheaper if you buy them from a utility