On 7/17/22 11:51 AM, John Langdon wrote: I was advised years ago by one of my trusted "Elmers" who had lots of experience with radio gear in the Navy that it is better to cut a window in your radio r
Does anyone know of a commercial stack-matching box (for 2 antennas) that will send the unselected antenna to another port? MicroHAM stack Switch would do that for two or three antennas. AFAIK, the
Does anyone know of a commercial stack-matching box (for 2 antennas) that will send the unselected antenna to another port? MicroHAM stack Switch would do that for two or three antennas. AFAIK, the
Jim, The question wasn't about a transfer switch ... it was about a stacking switch that would allow the antennas to be fed to separate rigs when not used as a stack. 73, ... Joe, W4TV That wasn't
Before anyone decides to engineer a full-scale change from UHF to N connectors, whether it be due to "electrical superiority", "water resistance", "reliability", or any other reason, I suggest that y
On 7/31/22 6:01 AM, Pete Smith N4ZR wrote: I have just bought a small Cushcraft 3-element 6-meter yagi. Only small fly in the ointment is that it is *only* rated at 1 KW. It looks to me that this l
The existing mast is 2" diameter ¼" wall 6061-T6 aluminum tubing. The rotor is 8 feet below the top of the tower / thrust bearing. What is the best way to join additional lengths of tubing together t
John KK9A After being reminded of the very helpful content on towers, prop-pitch motors, and yagi design on Kurt's website, K7NV.com, I wonder if someone on here, who was personal friends with him, c
How odd, it went to just Paul, not back to the list.. Here it is On 8/29/22 4:25 AM, Paul N1BUG wrote: I'm trying to get a better sense of how the rope in elements to stop vibration thing works. I
Someone suggested the rope-in-element trick, which cured the problem absolutely. Every element got the rope, which I believe was usually 3/8" poly - the cheapest rope we could find. I've always belie
On 8/28/22 4:51 PM, Kirk Kleinschmidt via TowerTalk wrote: Careful! Those non-Rohn bolts aren't "shouldered," they're probably "full thread" and, if so, are specifically not recommended for BX towers
Design and build a hall effect replacement for the HyGain rotor position pot. This part is the weak link in the rotor and new factory parts sell for $65. I'm thinking lots of people would pay $100 fo
On 8/30/22 9:19 AM, Andre VanWyk via TowerTalk wrote: Or, spend a bit more and get a 4O3A RotorGenius and bypass any pot, encoder or read switch on any rotor. I have been testing one on various rotor
Twenty years ago, the saying in pro audio was, "$200 for a box, $210 if you want it to do something." Add 20 years worth of inflation. Yeah, when we were making simple electronic/electromechanical pr
On 9/19/22 7:43 AM, Tyler Stewart via TowerTalk wrote: Ive got a bunch of this old cable I acquired through FRC thats been buried for 25 years and now I want to use it! Its about 1-1/4 with a spiral
A discussion of how NEC4 does insulated wires (in short, by changing the wave number of the propagation in the conductor) can be found in the NEC4 Theory Manual. Search for NEC4TheoryMan.pdf and the
I suspect that EZNEC does it by a similar approach - changing the length of the wire to a slightly shorter length to accommodate the slower propagation in the insulated wire. That may have been done
For a dipole or inverted V, esp with a tuner, that works. If you're doing some sort of multi element array, then you might care more. And there's the intellectual curiosity - There's two approaches
Not if all you're doing is throwing up a dipole and want a "reasonable" match - I just make it close, and use a tuner to take out the small error. But if you're doing a phased array (like a 4 square)
Just a quick note that after replacing the (insulated) #12 THHN with the same length insulated #12 "copper clad steel tracer wire", we could see no change in resonant frequency, so there seems to be