Aircraft Radio Band-Pass Filter Design

@yaroslavmark

Hi, I reviewed your aircraft radio noise issue and it aligns with my RF/EMI mitigation experience in mixed-signal and power systems. I’m an RF/embedded engineer with 15+ years of experience, having designed 20+ RF front-end and EMI filter solutions, reducing conducted/radiated noise by >30 dB and restoring clean comms across VHF bands in avionics-adjacent systems. Approach: ✅ I will perform spectral analysis (conducted and radiated) to characterize LED switching noise and identify dominant frequencies and coupling paths. ✅ I will define filter topology (LC/π/common-mode) matched to the Trig radio interface and target attenuation without degrading signal integrity. ✅ I will design and simulate the passive network, select high-Q components, and validate insertion loss vs passband requirements. ✅ I will prototype and bench-test the filter, documenting before/after spectra and providing a build-ready design. Questions: ✅ I need to confirm the exact radio model and operating frequency band (e.g., VHF 118–137 MHz). ✅ I want to verify how the LED system is powered and grounded to understand coupling mechanisms. ✅ I need clarification on installation constraints (inline, size, connectors, environmental limits). ✅ I want to confirm any certification or aviation compliance considerations for the final solution. Best, Yaroslav

@tetianam8

⭐⭐⭐⭐⭐ This isn’t just “add a filter”—LED strobes often inject broadband switching noise onto the power and RF path, so the fix has to be measured, targeted, and aviation-safe. I’ve handled similar EMI issues on avionics and embedded RF systems. Proposed approach (2 stages) 1) Noise characterization • Capture spectrum at the radio input and on the 12/28 V bus (near the Trig unit) • Identify dominant frequencies/harmonics from the LED drivers • Verify coupling path (conducted vs radiated) • Demonstrate suppression with temporary filters (bench validation) 2) Passive filter design • Design a compact LC/π filter (or common-mode choke + LC) tuned to the noise bands • Ensure minimal insertion loss in the aviation VHF band (118–137 MHz) • Validate with before/after plots and on-bench radio testing • Provide a small inline module (shielded, aviation-grade connectors if needed) Deliverables • Measured spectra + short report • Final schematic + component selection (aviation-rated parts) • Buildable filter (or PCB) + install guidance • Validation results showing noise reduction without degrading RX/TX Experience RF filtering, EMI mitigation, and mixed-signal noise suppression (including switching supplies and LED drivers interfering with comms). Quick questions • Aircraft supply voltage (12 V or 28 V)? • Is the noise entering via power, antenna, or both? • Exact Trig radio model? Happy to start with a quick measurement plan and go from there.

@aqib928

I can assist you with this task. Based on the description, this appears to be an EMI/EMC interference issue caused by the flashing LED system affecting the aircraft VHF communication band (118–137 MHz). I have experience in RF systems, EMI/EMC analysis, RF measurements, and RF filter design. Previously, I have designed notch, combline, cavity, and bandpass filtering solutions for SIF-TACAN, ADS-B, and other RF communication applications. To determine the root cause and propose an effective solution, we would first need some additional technical details regarding the radio setup, LED driver circuitry, power architecture, and observed interference characteristics. I also have hands-on experience in RF testing, spectral analysis, troubleshooting, and practical hardware validation.

@nichitav7

Hello, I will isolate the LED-induced RF noise at its source and deliver a validated passive filter that preserves your aircraft radio performance while eliminating interference. This project centers on identifying the exact coupling path and spectral footprint of the wing LED noise—similar work I’ve done on EMC mitigation for mixed RF/power systems (MCU + switching loads + radios), where filtering and layout-level fixes restored clean communication. Approach: • Perform spectral analysis (near-field probing + SDR/spectrum capture) to map noise vs. radio band • Identify coupling path (conducted vs radiated) into the Trig radio • Prototype filtering strategy (LC, ferrite, common-mode choke as needed) • Validate improvement with before/after measurements • Iterate for minimal insertion loss within the communication band Deliverables: • Noise characterization report with plots • Demonstration of effective filtering (measured suppression) • Passive filter design (schematic + component selection) • Build-ready implementation guidance (inline module or harness integration) Expected Outcome: • Clean radio operation with LED system active • No degradation of desired signal band • Practical, certifiable-friendly passive solution Before proceeding, I’d like to confirm the exact radio band, LED driver type, and installation wiring topology. Regards, Nichita.

@engrhasan01

Are you looking for an RF engineer who can identify the interference source from the wing-mounted flashing LEDs and develop a reliable passive filter solution for your aircraft radio system? I’m an Electrical and Power Electronics Engineer with experience in EMI mitigation, analog filtering, embedded electronics, and low-noise signal systems. I can support both the analysis phase and the hardware filter development needed for integration with the Trig radio. Proposed Approach Phase 1 – Noise Analysis & Validation • Perform spectral/noise analysis to identify interference frequencies and harmonics • Analyze coupling path (radiated vs conducted EMI) • Demonstrate filtering effectiveness through measurements/simulation • Document before/after spectrum behavior and radio impact Phase 2 – Passive Filter Design • Design a passive LC/RF filter matched to the affected communication band • Optimize insertion loss and attenuation performance • Ensure compatibility with aircraft power/radio environment • Prepare schematic, component selection, and prototype-ready design Deliverables • Spectral analysis summary and filtering validation • Passive filter schematic and BOM • Filter design calculations/simulation results • Prototype build guidance and integration notes for Trig radio installation I focus on delivering practical, testable filtering solutions that improve real-world RF performance without compromising system reliability. Best regards, Hasan

@alexsanderg3

Hi, One of the biggest challenges here is identifying whether the LED noise is entering the Trig radio through the power line, antenna path, grounding, or radiated coupling, because the correct filter design depends heavily on the actual noise path and frequency spectrum. I can support this in two clear stages: first, perform spectral analysis to identify the noise frequencies and coupling behavior, then design a suitable passive filter that suppresses the interference without affecting the aircraft radio’s required operating range. I have experience with RF-aware electronics, passive filtering, EMI/noise troubleshooting, signal analysis, grounding issues, and communication-system protection. For the first phase, I would review the radio/LED wiring setup, capture the interference spectrum, compare it against the radio band and power-line noise behavior, and demonstrate the expected filtering approach through simulation or bench testing. For the second phase, I can design the passive filter, select aviation-appropriate components, prepare the schematic/BOM, and support prototype testing before installation.

@Mwaleed30

Being an Electronic Engineer, Hardware Designer and a skilled PCB Designer with 3 +years of experience I make proper R&D projects Full schematics and real life single layer ,2 layers ,4 layers ,6 layer and multi-layers PCBs projects (i.e: 1:PCB of compact ear buds 2:Pcbs for compact usb with advanced security features 3:Pcbs which involves USBs 4:Also i made many large projects which handles high voltage AC and DC 5: 6 -layers PCB of Arm Cortex Processor involving Programming 6: Programmable Frequency Generator PCB 7: Compact Smart SOS PCB 8: High Volatge Ac to DC Converter with MCU STM32 programmability’s for 10KW system 9: 10KW AC Inverter with output voltage 24V 10: Qi 1.3 Wirless Charger Transmitter and Reciever 11: PCB for agricultural watering system that controls 50 fig trees with expansion capability to 100 trees) 12: Custom IO Board Design for Raspberry Pi CM5 with Integrated RP2040 And many more I have advanced level grip on softawares like Easyeda-Pro ,Kicad, Altium I will show you my PCB work separately I will handle your project and made it perfect in the best cheapest price and do its customisation First see me work then Hire me You can also see my Portfolio which reflects some of my PCBs projects In the end i will assure you that you will get professional level and great quality work in the best price Thankyou

@romant84

Hi, there I read your requirement carefully. I can help you. I have strong and enough skills and experiences in this part. I received orders from many requesters, completed the tasks perfectly and provided them with maximum satisfaction. If you work with me, you are guaranteed maximum satisfaction and money savings.

@michealh790

Hi, thanks for outlining the project—this is a very interesting RF and EMI mitigation challenge. I’m Micheal, and I have experience in RF Engineering, passive filter design, and electronic noise suppression for sensitive communication systems. I’ve worked on interference reduction involving switching noise, power electronics, and EMI generated by LED drivers and PWM-controlled lighting systems. Your proposed two-step approach is exactly the right methodology. First, I can perform spectral analysis of the interference to identify the dominant noise frequencies and coupling path affecting the Trig radio system. From there, I’ll develop and validate an effective passive filtering solution designed specifically for the operating frequency range and aircraft environment. The final design can include optimized LC/ferrite filtering, shielding, grounding considerations, and compact integration suitable for attachment to the radio system without impacting normal communication performance. I focus on practical, lightweight, and reliable designs appropriate for aviation applications. I can provide clear test documentation, filtering performance results, schematics, and prototype guidance/build support as needed. I’m available to start immediately and can move quickly once system details are shared. Best regards, Micheal

@sarahmirza5060

I am an aerospace engineer, so I understand both aircraft system constraints and the importance of maintaining communication reliability without introducing additional signal loss. Here is how I would approach it: • Perform spectral analysis to identify the dominant interference frequencies and harmonics • Determine whether the noise is primarily conducted, radiated, or both • Evaluate the radio operating band and allowable attenuation limits • Design a passive filter matched to the interference profile while preserving communication performance • Validate filtering effectiveness through before/after analysis You will get: • Noise spectrum analysis with identified interference bands • Filter design calculations and component selection • Passive filter design ready for integration with the Trig radio • Verification results showing noise reduction effectiveness My focus will be on building a practical aircraft-compatible solution, not just a theoretical filter. If you can share the radio model, LED driver details, and any recorded interference data, I can review feasibility immediately.

@josephn218

Hello, I am very interested in assisting with your aircraft radio band-pass filter project. I have experience in RF engineering, analog circuit design, and signal processing, including passive filter design for sensitive communication systems. For your project, I can provide: • Spectral analysis of the LED-induced noise and demonstration of effective filtering • Design of a passive band-pass filter tailored to the Trig radio frequency range • Simulation and validation of filter performance before implementation • Clear schematics, component recommendations, and integration guidance I focus on designing reliable, high-performance filters that meet strict aerospace communication requirements. Estimated Timeline: 3–5 days for analysis, design, and documentation. Best Regards