8/8/2023 0 Comments Antenna tuner simulator![]() ![]() Can you explain or point me to a reference that would explain why, for a given frequency, the capacitance/inductance required for the lowest SWR would vary over time? Thanks.Īctually, I’m not an antenna guru at all, nor do I have any experience with G5RV antennas, but I’ll take a swipe at answering this. Even the best setting on the inductor (which has 18 settings) will vary +/- a setting over the course of a month. I opened the Daiwa tuner and both variable capacitor plates are consistently 1/2 meshed at the “5” reading (on a scale of 10) and the knobs are on solid, so it isn’t a matter of the capacitance scales being inaccurate/varying. Seems like that shouldn’t be much of a moving target. My question for you is why the settings for a minimum SWR on the antenna tuner for either antenna vary more than slightly from day to day, rather than remaining fixed? As I understand it, the tuner’s function is to make the impedance between the tuner and the rig look like 50 ohms, despite the fact that the transmission line to the antenna has a section of 450 ohm ladder line, a balun and 52 ohm coax feeding it (both > 90 feet). It’s a bit of an annoying process, as the low SWR setting I get in low power will vary as I increase the output to full power, and being slightly off will result in a high SWR. I’m able to get close to a 1.0 swr on most bands on both antennas, after jockeying the capacitance and inductance settings (after first listening for peak signal strength). The rig is a Icom 751A and I’m using a Daiwa CL-680 antenna tuner. I have a couple of new G5RV’s made by W8AMZ, one for 80-10 and another for 40-10, polarized in opposite directions, up 55 and 45 feet in different parts of my city lot here in Ann Arbor. I know you are an antenna guru, so I thought I’d run a question by you, if you don’t mind. I’ve been a ham since I was a young teen in 1965, but only recently became active again, in retirement. WSDMAVIS 1 Set 1.8-50 MHz ATU-100 Automatic Antenna Tuner DIY Kits…įiled Under: antennas, Gear/Gadgets Tagged With: Amazon, antenna tuners One-Day Tech Class Videos: Using Coax, SWR, Antenna Tuners HF Transceiver Kit Manual Antenna Tuner Tune DIY Precision Kit 1-30… HAM HF Band Radio Antenna Balun QRP Tuner Amateur DIY kit NXO-100 TecMad ATU-100 EXT 1.8-55MHz Automatic Antenna Tuner by N7DDC… Vbestlife Automatic Antenna Tuner Aluminum Alloy Tester C Type… Zerone 1-30 Mhz Manual Antenna Tuner kit for HAM RADIO QRP DIY KitĪutomatic Antenna Tuner,ATU-100 EXT 1.8-55MHz 100W Shortwave Mini… SDRGEEK ATU-100 EXT 1.8-55MHz Automatic Antenna Tuner by N7DDC 7×7,… If you go to Amazon, and search for “AT-100” you’ll find at least one other similiar kit. NOTE: A reader has reported that this link no longer works. KKmoon ATU-100 DIY Kits 1.8-50MHz ATU-100 Mini Automatic Antenna… $55.99 My question, though, would be how effective and reliable are these antenna tuners? Has anyone purchased and used one of them? If so, perhaps you could get in touch with me, and we could do a short review. ![]() For about $50, you get a 100 W, automatic tuner kit. I think that the ATU-100 kits look kind of cool. So, I shouldn’t have been surprised when I got an email from them three weeks ago titled, “KKmoon ATU-100 DIY Kits…” The email included link to two ATU-100 antenna tuner kits, several assembled antenna tuners, and three QRP antenna tuner kits. Not big items, but stuff like BNC-to-binding post adapters and the SMA-BNC adapters for my HTs. ![]() I buy a fair amount of electronics stuff from Amazon.
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