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Log Periodic Antenna Calculator  ^updated - Online calculator for Logarithmic Periodic Dipole Antenna LPDA

Center-Fed Wire Dipole Antenna Tuning Calculator - Ever need a way to estimate the amount of wire to add to or remove from a center-fed wire dipole antenna to achieve resonance at a desired frequency? This article help to determine correct wire lenght.

Quad Antenna Calculator - An online quad antenna calculator for a 2 3 4 elements quad

HA8TKS VHF DXCluster - VHF and Up DX-cluster with map mash-up includes list, HAM tools, QRB calculator by HA8TKS

HA8TKS Tibor Priority listing - HA8TKS website dedicated to amateur radio VHF DXing include a dx-cluster map & list, HAM tools, QRB calculator and personal statistics

RF Calculators - A collection of calculators from everything RF for various applications VSWR, attenuator resistance valies, microstrip, coax, unit conversions and many more.

Single-layer Coil Inductance and Q Calculator - This calculator ask as input diameter, lenght turn and frequencu and will return L and Q

Resistor calculator - This resistor calculation tool shows which combinations of two resistors, series or parallel, gives a match better than the closest standard value.

Variometer Design - Online variometer calculator by IN3OTD

Coaxial Line Impedance Calculator - Online coax cable impedance calculator

Notch Filter Designer - Online calculator, Butterworth Bandstop (Notch) Filter Designer

Constant k Lowpass Filter Design - Online Constant - k Lowpass Filter calculator

Highpass filter calculator - Butterworth Highpass Filter Designer