On 7/13/21 4:52 AM, john@kk9a.com wrote: Like many posts, this went off on a tangent. If it was for connecting two parallel wires, I would have suggested the western-union splice. I use this splice a
Be aware that the Kevlar fibers of Phillystran behave very differently than steel wire. The Kevlar fiber is very strong axially with about 60% the modulus of steel. The fiber also has very complex
A multimeter with a couple hundred feet remote readout. Best if the readout was on my android phone, but a pc would be acceptable. The need is troubleshooting stuff happening at the tower/up the to
On 7/27/21 1:56 PM, JOHN OWENS wrote: It is pretty clear that my Heathkit Dummy load is Dead. I need to measure my FTDX-101MP output on 6M (<200w) just to verify it is working as it should, before I
I have a multi-KW forced air-cooled dummy load. It came from the Boeing plant in Wichita KS. The official designation is "Dummy Load Modulator". Dummy load I understand, but WHAT is the "modulator" p
Brite-Zinc seems to me like an anti-rust paint, for protection. Usually on steel. Urethane aliphatic enamel is a synthetic cover to give an extra protection layer on the top of the zinc. Professional
On the RCS-8V, that's an optional jumper - the instructions tell you where to bridge with solder. _______________________________________________ _______________________________________________ Tower
On 8/10/21 4:40 PM, KD7JYK DM09 wrote: For my situation, I am planning to install 1 kw dummy loads to the unused ports and see what happens. I was hoping that someone would provide some realistic inp
I'll make a pitch here for a useful book by Ronald Standler "Protection of Electronic Circuits from Overvoltages" Rather than blindly copy another design (which may have had other design constraints,
<There was an op in Texas who mounted 4 of these on a rotating tower. There <was an article in one of the ham magazines some years ago about it. But it <was impressive. The TH7 has 5 elements on 10mt
I'd be surprised by more than 3 dB I'd want to see a comparison with the same transmitter and feed lines, and just turn the other 3 antennas off. After all, if he had 100W feeding each antenna, rathe
At theoretical best, 6dB, unless there is significant mutual coupling, and even then... Power going to antennas divides by 4, -6dB to each antenna. Electric fields from each antenna sum coherently, s
Thanks Stan, K5GO The traditional guide line for antenna ranges is 2 D^2/lambda, where D is the diameter of the antenna. That has to do with the phase difference from a plane wave being small enough
I have absolutely no hard engineering facts for you, other than to say that when I installed my 4-squares a few years ago, I located a small signal source about 200' away from all the arrays and made
Thanks, Jim. Stan Sent from my iPhone You're right.. brain freeze. But 22.5 meters seems awfully close. 2 D^2/lambda is the equation - 2 * 30*30/80 = 1800/80 = 22.5 meters Granted that's for "direc
and look at the figure on page 4. This shows the usual antenna range situation where the test antenna is receiving a signal from a point, or small aperture source. This is how I would run this com
On 9/5/21 6:31 AM, Joe Subich, W4TV wrote: On 2021-09-04 11:19 PM, Lux, Jim wrote: D =30m (across the 4 square diagonally) is almost certainly bigger than the height of the 80m elements (20m?) Even t
On 9/5/21 12:36 PM, Richard (Rick) Karlquist wrote: Instead of using rules of thumb from ancient history, you can get a far more precise answer by simply modeling the antennas under test and the test
This was for a 4 square transmitting array and a movable receiving vertical. 73 Rick N6RK So you set up a "test receiver" vertical, and looked at the current in the vertical (or in a load resistor)?
I assumed Locktite Blue or Red would do that for me but I have since learned there are dozens & dozens versions. I clearly picked the wrong products as they never "dried" or hardened. I have 263 Red