HF Tuner Lab
Turn the controls. Watch the match.
Predicted · at the transmitter
Station & antenna
Positive X = inductive. Negative X = capacitive. Enter impedance at the tuner's antenna port.
Matching network
Set installed types and limits in
L · installed component
Air coupling
L becomes the primary coil Lp. Ls is the isolated secondary. C1 is in series with Lp; C2 is across the secondary load. The load R+jX is measured between the two output terminals. The balanced/unbalanced selection shows the wiring; both use the same differential impedance model. Common-mode current and parasitic capacitance to ground are not included. k describes coupling; it does not specify a physical coil spacing without geometry.
Ls · secondary coil
C1 · installed component
C2 · installed component
Signal path
Ideal reactive elements · no component or feedline lossesSWR around your frequency
SWR vs frequency MHz · display capped at 10:1
━ Tuned input ━ Antenna load · vertical scale capped at 10:1
This frequency preview holds the entered antenna R + jX constant. It is not a measured antenna sweep.
What the tuner changes
The network transforms the load impedance toward 50 + j0 Ω at the transmitter. A good input match does not change the antenna's radiation efficiency or remove SWR on a feedline beyond the tuner.
*Accepted power is forward power minus reflected power for this ideal network. It is not a prediction of radiated power. The sweep holds antenna impedance constant; a real antenna's impedance varies with frequency. Auto Match searches the selected topology and component limits; some loads need a different topology.
Real antenna measurements
No instrument connected. Simulator values are calculated.
USB: select the instrument serial port. Bluetooth serial: pair in Windows first, then select its port. BLE: choose the device's UART profile. Bluetooth support requires matching hardware and data protocol; this cannot add a Bluetooth radio to an analyser.
Measured · after the tuner
No measured impedance available.
No reading.
The measured load SWR can remain high after a successful tuner match. This output-side sensor cannot verify amplifier input SWR or authorize high power. USB data is monitoring only; protection belongs in hardware.
Your installed components
Enter the range from each component or its datasheet. Auto Match stays within these limits. Return to Simulator to turn the tuning controls.
L · primary / series inductor
Used when this component is active in the selected topology. Set its current value in Simulator.
C1 · capacitor
Used when this component is active in the selected topology. Set its current value in Simulator.
C2 · capacitor
Used when this component is active in the selected topology. Set its current value in Simulator.
Ls · link secondary inductor
Used when this component is active in the selected topology. Set its current value in Simulator.
Enter the range printed on your component or its datasheet. Auto Match uses these installed limits. At the same capacitance, air and vacuum types behave identically in this ideal model; losses, mounting parasitics and breakdown are not modelled.