Sorry Mat, but your interpretation is wrong and could lead to a tower failure. Here's how that paragraph is presented: "WIND LOAD is the worst-case wind resistance for the antenna. Using the latest s
Does anyone have VSWR curves plotted for the Cushcraft A4 they could share with me? Plots from an antenna simulator would be okay but I'm more interested to see real life data of installed antennas.
UPDATE: I received a few direct replies with the VSWR data points I wanted. Thank you. I created a VSWR graphing tool using Excel to plot the information I received. The tool will allow you to print
This is a used antenna purchased from a -sk- estate, so the original performance is unknown. The antenna had been stored for a couple of years prior to installation a few weeks ago. The dimensions we
First, my apology for not changing the previous message subject... I RX Towertalk in digest mode and forgot to correct that. Joe, W4TV, send me a photograph of a trap that was disassembled. It is ind
Here's the report with the solution to the bad VSWR experienced with the Cushcraft A4 antenna in question... "We took down the DE and completely went through it. Severely corroded pan head screws, so
There is an interesting article about this, here: http://www.carcraft.com/techarticles/116_0609_using_rod_bolt_stretch_tool/index.html I'll have to check my tower bolts to see if they have the "dimpl
Steve, No, this was very good information. I see it fitting in nicely with the "True North", "Owl", and "Wench" threads when the bands are dormant! 73 de Bob - KØRC in MN Message: 4 Date: Fri, 30 Apr
Take a look at the 20 foot self-supporting figures. This must be some kind of "magic length" as Rohn 45 with no ice will support 22 ft^2 and with 1/2" of ice it will support 25 ft^2. The ice must be
I ht the Enter key too soon... it looks like the 10 foot height shows the same characteristic. Take a look at the 20 foot self-supporting figures. This must be some kind of "magic length" as Rohn 45
The details of Mike's passing are posted on the I.C.E. website, here: http://www.iceradioproducts.com/ 73 de Bob - KØRC in MN -- _______________________________________________ ______________________
Jim Brown, K9YC wrote: "BUT - in my experience, vertical dipoles don't work very well on the HF bands." My personal experience is a little different Jim! I have a single self-supporting tower for all
Please tell me what this #2-#4 wire is going to do that the Faraday shield effect of the tower legs around the rotor is not going to do? Or the metal of the rotor bell-housing itself? That pot is bur
How is enough RF voltage (hundreds of volts) built up across the lubricant between the ball bearings and the race above/below? Both the top and the bottom of the rotor casing are at ground potential.
You said: "The center of the pot is connected to the rotor bell housing so any resistance between the top and bottom of the rotor will allow current to go thru the pot." If the center of the pot is g
Thanks for all the feedback so far... After I posted my question I dug around in my book library and found "Physical Design of Yagi Antennas" by David B. Leeson W6QHS. That was ARRL publication #3819
Grant, I was aware of the Moxon antenna design but it never entered my mind as an option until you mentioned it! I see the main horizontal element(s) are about 50 feet long and the folded tips are ab
This antenna might have originated for a non-amateur user that needed coverage below 7 MHz. That might be a reason the smaller tube was shoved so far inside the larger tube. I'll probably never know
Hi Mike... No, unfortunately I don't know much about the Telrex designs. When they were manufacturing antennas I was lucky to be able to afford 150 feet of copper wire, some TV ribbon cable, and an 8
I have one of those controllers apart, spread across the workbench downstairs! I concur, if you don't have patience / experience with Rube Goldberg construction, avoid trying to replace that lamp!!!