A complete engineering resource for radio communications and DAS professionals. Covers in-building distributed antenna system (DAS) design, bi-directional amplifier (BDA) sizing for public safety radio coverage under NFPA 1221 and IFC Section 510, RF link budget and propagation modeling, Fresnel zone clearance, and two-way radio system planning.
Built for RF/communications engineers, fire alarm and low-voltage integrators, and public safety radio coordinators. Covers the coverage-verification thresholds (−95 dBm) and testing procedures required for ERRCS/BDA system acceptance.
Visualize RF coverage using the log-distance path loss model. Set frequency, TX power, antenna height, and environment type (free space, urban, indoor, dense indoor) and watch an animated coverage circle update in real time. Displays path loss at 10–500m, RSSI contours at -70/-85/-95 dBm, and coverage radius for a configurable minimum signal threshold.
Trace a DAS signal cascade from donor antenna to remote antenna in real time. Configure BDA output power, splitter count and loss, cable type and run length, and indoor antenna gain. Displays dBm level at every node in the chain — donor RSSI, BDA input/output, each splitter port, cable end, and antenna port — with pass/fail verdict against NFPA 1221 minimum RSSI.
Simulate a BDA system covering a multi-zone floor plate. Assign donor RSSI, BDA gain, cable and penetration losses, and interior antenna EIRP per zone. Each zone displays inbound and outbound RSSI with IFC 510 / NFPA 1221 compliance verdict (-95 dBm minimum). Adjust BDA gain and distribution losses to reach full floor compliance.
Animated cross-section of a point-to-point microwave or public safety link. Shows 1st and 2nd Fresnel zone radii at any point along the path, earth bulge correction, and obstruction height. Calculates required antenna height for 60% 1st Fresnel zone clearance. Configurable frequency, link distance, and terrain obstruction height.
Simulate a 5×5 grid of test points on a building floor and run an NFPA 1221 Section 9.6 / IFC 510 coverage test. Configure donor RSSI, BDA gain, cable loss, and penetration loss per zone. Each grid point shows inbound and outbound RSSI, pass/fail status, and the floor's overall coverage percentage. Adjust system parameters to reach 95% area coverage.
Visualize omnidirectional and directional antenna radiation patterns on an SVG polar plot and a top-down floor grid. Place up to 4 antennas with configurable EIRP, pattern type (omni, 60°, 90°, 120° sector), and orientation. The floor grid shows signal level at each point using a heat-map color scale, identifies overlap zones, and flags dead spots below the minimum RSSI threshold.
Friis equation end-to-end: TX power, cable/antenna gains and losses, FSPL, receiver sensitivity → RSSI and fade margin. Pass/fail verdict.
FSPL in dB from frequency and distance. Preset bands: P25 700/800, VHF, UHF, LTE, Wi-Fi. Distance table at all ranges. Feeds link budget.
Attenuation by cable type (RG-58 → 7/8" heliax), frequency band, run length, and connectors. Side-by-side cable comparison table.
EIRP from TX power (dBm/W/mW), cable loss, connector loss, and antenna gain. FCC Part 15/90 compliance check with margin display.
Required BDA gain from donor RSSI, cable losses, antenna gains, and penetration loss. NFPA 1221 / IFC 510 compliance verdict.
Coverage radius and area from EIRP, frequency, and min RSSI. Log-distance model with adjustable propagation exponent for 6 environments.
1st & 2nd Fresnel zone radii at midpoint, required 60% clearance, earth-bulge correction, and minimum antenna height for P2P links.
Convert dBm ↔ dBW ↔ W ↔ mW ↔ µW ↔ dBµV (50Ω). dB addition/subtraction tool. Tap common signal levels for instant reference.
Public safety in-building coverage compliance: inbound/outbound RSSI, area coverage %, and point pass rate vs. IFC/NFPA requirements.
Friis cascaded noise figure for up to 4 stages (LNA, filter, cable, BDA). System sensitivity from kTB + NF + SNR. Uplink chain design.
Radio and RF work spans FCC operator licenses, RF/telecom technician certifications, and engineering licensure. This overview covers the FCC GROL and amateur licenses, iNARTE/ETA RF certifications, and the PE Electrical path for RF engineers.
FCC GROL prep: the commercial license to maintain/repair transmitters — radio theory, FCC rules, antennas and safety.
FCC Amateur (Technician/General/Extra) prep: operating practices, radio theory, rules, antennas and propagation.
iNARTE certifications prep: professional RF, telecom and EMC credentials — RF systems, wireless and EMC/EMI.
ETA RF/DAS prep: technician certifications for RF, distributed antenna systems and in-building/public-safety wireless.
PE Electrical prep (for RF engineers): electromagnetics, communications theory, signal processing and electronics.
Interactive 12-section radio communications reference covering RF spectrum, LMR/P25 trunked systems, in-building DAS (IFC 510), cellular/5G, microwave backhaul, satellite comms, radio propagation, antenna engineering, emergency responder radio (ERRCS/BDA), FirstNet, and FCC spectrum licensing.