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For First Responders · RF Front End

RF Front End for a grounding scheme

Built for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field. Simulate a grounding scheme live below — adjust the inputs and watch it respond, right in your browser.

Filter Designer

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Analog Filter DesignerLive

RC & RLC frequency response

Controls

Presets

Resistance R (Ω)

Capacitance C (nF)

Passive filters shape a signal's frequency content with resistors, capacitors, and inductors. An RC low-pass or high-pass has a cutoff at 1/(2πRC) where the response drops 3 dB; an RLC bandpass resonates at 1/(2π√(LC)) with sharpness set by its quality factor Q.

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Data Inspector

Cutoff fc1.6 kHz

Resonance f₀5.0 kHz

Quality factor Q0.32

Governing equation

∣ H (f) ∣ = \frac{1}{1 + ( f /1592 ) ^{2}}

Reading this result: Low-pass: signals below the 1.6 kHz corner pass, above it they roll off at 20 dB/decade, and the response is exactly 3 dB down right at the corner.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Transmission Line

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Transmission Line & VSWRLive

impedance matching · reflections

Controls

Speed1×

Presets

Line impedance Z₀ (Ω)

Load resistance RL (Ω)

Load reactance XL (Ω)

When a transmission line meets a load that does not match its impedance, part of the wave reflects. Incident and reflected waves combine into a standing-wave pattern measured by the VSWR. A perfect match (RL = Z₀, XL = 0) gives VSWR 1 and no reflection — the goal of every antenna and RF design.

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Data Inspector

Reflection |Γ|0.200

VSWR1.50 : 1

Return loss14.0 dB

Matchpoor

Governing equation

∣Γ∣ = \frac{Z _{L} - Z _{0}}{Z _{L} + Z _{0}} = 0.200, VSWR = 1.50

Reading this result: A large resistive mismatch reflects much of the wave, giving a high VSWR and deep nulls in the standing-wave pattern.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Radio Range

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Radio Range / Link BudgetLive

VHF/UHF horizon + path loss

Estimated usable range

9.7mi

Controls

Presets

Base antenna (ft)

Portable height (ft)

Power (W)

Frequency (MHz)

Rx sensitivity (dBm)

Combines the radio horizon (1.23·(√h₁+√h₂), feet→miles) with a free-space link budget (EIRP minus path loss vs receiver sensitivity). Actual range depends on terrain, foliage, and buildings — treat this as a best-case planning estimate.

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Data Inspector

Radio horizon9.7 mi

Link budget147 dB

Limited byline-of-sight

Governing equation

FSPL = 20 lo g_{10} (\frac{4 π d}{λ}) = 147 dB (d = 9.7 mi, f = 155 MHz)

Reading this result: Range is capped by the horizon at 9.7 mi — raising the base antenna helps more than adding power here.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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Frequently asked questions

Is this good for first responders?: Yes — this version of "RF Front End for a grounding scheme" is framed for first responders planning or training for real incidents. Run fast what-if scenarios for response planning and training — no software to install in the field.
Do I need to install anything?: No. It runs in any modern browser, free, with no account required.