Jul 26, 2022 · Your conclusion is wrong. The antenna is electrically long and multi- lobing. You assume it is a single-lobe monopole, such as a 1/4 wave.

Dec 6, 2016 · "This week on Ham Radio 360's WORKBENCH program, we'll be bringing you details of a $60 Arduino based antenna analyzer kit that supports SWR, line loss, complex impedance and TDR measurements from 1 to 50 MHz. This versatile RF lab tool can be built by you in a few evenings, then used in your shack for "no-guesstimate" antenna, coax feedline ...

Dec 20, 2021 · However, inserting my antenna tuner in line allows me to easily tune 160, in fact it's nearly normal. On 75 meters the band is perfectly normal but if I bypass the tuner the ADC receiver overload indicator comes on.

Dec 10, 2019 · The NanoVNA provides alot of value in a tiny size. It has features that go beyond what we need most of the time with amateur radio, so there is a bit more complexity to the unit. With that said, if you have a bit of patiences you can …

Dec 10, 2022 · A nice dip on an analyzer doesn't say an antenna is efficient. I once built a tuning reference for an antenna production line. The reference was a 51-Ohm resistor in series with a mica capacitor and an inductor. It was tweaked to dip at the center of a ham band, and it was enclosed in a solid brass box with soldered seams.

Dec 9, 2019 · One day, Dad was tuning his KW rig, trying to get the antenna to match on a 5 MHz MARS frequency. This generated so much RF voltage that it made an arc from the top of the feedline insulator, through the bakelite, through the 3/4 inch plywood, and through the enamel on top of the freezer where the antenna tuner was sitting.

Aug 28, 2019 · Version of that in an RSGB antenna book 50' long with 25' counterpoise made with speaker wire and a toroid wrapped at the end, the speakerwire goes straight into a tuner, covers 40-10, a half size covers 20-6.

Feb 7, 2017 · On this episode of Ham Radio Q&A, I build a 2 meter tape measure yagi antenna. This lightweight antenna is perfect to use for fox hunts or as a portable directional antenna for public service events. There are plenty of plans online to build your own tape measure antenna, but no good step by step video that takes you through the process.

Dec 20, 2021 · IOW, as you say, nothing changes from the antenna standpoint. IOW the noise you receive at the antenna,and the signal you receive at the antenna--at a given frequency-- are 'locked'. All a tuner can do is make sure the overall antenna input voltage to the receiver is stronger than the noise of the receiver itself, by matching.

Oct 14, 2023 · When the antenna with four 33' radials is mounted 1" above ground (grass height), Cu improves the radiated signal just 0.9 dB. Ground losses overwhelm much of the improvement in coil Q. But if the antenna is mounted on a 30" picnic table (radials horizontal for modeling simplicity), SS gain improves 4.4 dB over SS at 1".