RF Radio Network Suite & Calculators

Operator databases, RF performance estimators, and field calculators

Sync All Calculator Steps Chains Wavelength $\rightarrow$ Coax $\rightarrow$ ERP $\rightarrow$ Range

Operator Callsign Lookup

Search official FCC database for Amateur (QRZ) or GMRS (gmrs.app).

1. Wavelength

Frequency & Element Sizing

Frequency (MHz):

Master frequency for wavelength and calculations.

1/4 Wave 19.2 in

1/2 Wave 3.2 ft

5/8 Wave 4.0 ft

Full Wave 6.5 ft

3. dB Gain & ERP

Effective Radiated Power

Power at Antenna (W): Synced from Coax Feedline Loss

Antenna Gain (dBi):

Gain 3.00 dBd

ERP 100.00 W

4. Radio Horizon

Line-of-Sight Calculator

Antenna 1 Height (ft):

Antenna 2 Height (ft):

Max Range 10.4 mi

Kilometers 16.7 km

Final: RF Link Range

Power, Height & Freq Model

Combines your ERP Power and Radio Horizon to estimate practical usable coverage.

Scales dynamically with all adjustments.

Est. RF Range 14.2 mi

Kilometers 22.8 km

2. Coax Feedline Loss Estimator

Estimate signal attenuation and feed delivered power to the antenna feedpoint.

Transmitter Power (W):

Frequency (MHz): Synced from Step 1 Wavelength

Cable Length (feet):

Cable Type:

Total Line Loss -1.85 dB

Power at Antenna 32.7 W

Specialty Engineering Tools

Advanced calculators for Battery Runtimes, Fresnel Zones, and Coaxial Stubs. (Hover titles for details)

Enable Specialty Tools

Field Day / Go-Box Battery Runtime Estimator

Estimate operating hours based on battery capacity and duty cycle.

Battery Capacity (Ah @ 12V):

Receive Current (A):

Transmit Current (A @ 50W):

Estimated Continuous Runtime (20% TX / 80% RX Duty Cycle): 18.5 Hours

1st Fresnel Zone Clearance Radius

Calculate maximum obstacle clearance needed at the midpoint of an RF path.

Path Distance Total (Miles):

Operating Frequency (MHz):

Max Radius at Midpoint (60% Clearance Required): 24.5 ft

Coaxial Stub Filter Length Calculator

Cut-to-length physical stub dimensions for harmonic filtering / notch stubs.

Target Notch / Filter Frequency (MHz):

Cable Velocity Factor (VF):

1/4 Wave Stub (Short/Open) 1.48 ft

1/2 Wave Stub (Bypass) 2.96 ft

SWR & Reflected Power Dashboard

Calculated in 1/10th increments up to 5.0 SWR

Transmitter Power (Watts PEP):

Safe Zone (1.0 - 1.5)

Caution Zone (1.6 - 2.0)

Danger Zone (2.1 - 5.0)