Once it does, the settings are stored in EEPROM so that they can be recalled later.Īfter the break, check out a video of the tuner clicking its relays and matching a load. By varying the load, it can find the ideal matching for the given antenna and frequency. To automate tuning, an Arduino switches a bank of capacitors and inductors in and out of the circuit. The RF signal is also divided and sampled to measure frequency. Using this data, the device can calculate the SWR. They are buffered and fed into an Arduino for sampling. This device allows the forward and reflected signals on the line to be extracted. First, it measures the SWR of the line by using a tandem match coupler. This process uses a load to match the transmission line to the antenna, which controls the standing wave ratio (SWR).
It features a signal 1 to 2 S units better than a dipole and 2 to 3 S units over 1/4 wave vertical antenna.To get the best power transfer into an antenna, tuning is required.
Its inverted L or V installation is impacted very little by height above ground
#Arduino antenna tuner portable#
Quick "tuning by ear" makes portable operation easy and quick Since it is end fed, its installation for portable operation is easy, only a single wire must be installed over a tree in the shape of an inverted L or inverted V The Fuchs antenna has many great features:ĭue to a high-Q LC circuit, the Fuchs antenna is optimally tuned to 50 Ohms coax and hence has high efficiency of Reports and has achieved longest distance of QSO: ///sota/wsprviz2/?p=20170702_gurten_40mĪntenna on test with Fuchs Resonant Antenna Tuner is antenna marked as "G". Images on this web page show that Fuchsantenne got largest No. Link to this test is here: ///t/seven-sota-antennas-compared-using-wspr-on-a-summit/15635 According to this test only Fuchsantenne made a QSO longer than 2000 km. With a help of QRP ATU a single half wave length long wire becomes a very effective portable antenna.Ĭheck Test Report of 7 antennas, among them was also our Fuchstantenne.
#Arduino antenna tuner install#
However, due to their design, those antennas do not have all the advantages (narrow bandwidth and High Q) of the Fuchs antenna.Īfter several years of testing the Fuchs antenna on base and portable stations, we believe we have found the ultimate portable antenna that works great, is easy to install and the distance from ground does not have huge impact. Today's commonly known End fed antennas that are advertised and sold around the world are implemented with one wideband transformer, which does work. A narrowly tuned antenna also functions as a preselector.Īnother good feature of the Fuchs antenna is that it is easily pulled across trees and its performance does not vary much with respect to distance above ground in contrast to dipole or inverted V antennas which are commonly in use by SOTA operators.įurther, it has reception 1 to 2 S units better on DX than a dipole with less received noise. But this is actually the advantage of the Fuchs antenna, because when tuning the antenna, the operator can hear an increase in signal volume and must not make a SWR measurement. The Fuchs antenna has not been used much mostly due to the fact that it has very narrow bandwidth and needs to retuned every few kHz, something most ham operators do not like. The higher the Q, the higher the efficiency of the antenna. The resonant circuit should have high Q, which especially impacts the coil selected. It's in the shape of an inverted L, the length of the radiating element is half wave length long and it is fed through a resonant circuit. The Fuchs antenna has been known for many years. This tuner is QRP version, max 10W RF allowed.Įach Tuner comes with it's measurements performed on Mini VNA as seen on images. This Tuner will work on 40, 30 and 20m bands with half wave length long piece of wire. To use it connect half wave length long piece of wire to red socket. Enclosure is CNC cut and engraved from copper clad laminate that is electrically connected inside so that virtually no interference can interfere with tuner components. Resonant Fuchs antenna Tuner consists of 1 piece assembled Tuner as shown on images.
0 kommentar(er)
