Operating Experiments

Inspired by 52 weeks and 30 days of Ham Radio, here is a long list of experiments and challenges.

Work Currently in Progress

GIS / Python Propogation Analysis

Goal: Model theortical Tx / Rx capabilties of current 2m/70cm set up and compare to real world data. This will help set a bench mark for further reception improvements, assist in operational reliability, and as a basis for comparison for unusual environmental events such as trophsperic propogation. Band: 2m / 70cm Mode: APRS / FM Result: Maps indicating station range, incorporating different factors affecting VHF propagation - free path loss, terrain, atmospheric effects, etc. Tools: QGIS, Python (pycraf package), SDR, AT-878, Slim Jim 2m/70m antenna

***Two Transistor LED Flasher
Goal: Understand transistor switching
Key Concept: RC timing

In Progress

  • APRS Propagation Study
    Logging reception quality at varying power levels and path configurations.

  • Home RF Noise Survey
    Identify and map sources of interference within the immediate area.

VHF Range & Propagation

  • Maximum VHF Reach
    Map VHF transmit/receive limits in multiple directions and document terrain effects.

  • Tropospheric Ducting Hunts
    Log distant signals during favorable atmospheric conditions.

  • Line-of-Sight Mapping
    Compare predicted vs observed reception ranges based on terrain.

Satellite & Space Operations

  • ISS Contact / Packet Reception
    Attempt two-way contacts or receive telemetry from the International Space Station.

  • Satellite Pass Tracking
    Receive signals from amateur satellites and measure Doppler shift.

Data & Digital Modes

  • APRS Packet Analysis
    Collect, decode, and analyze APRS traffic over time. Study digipeater paths and station density.

  • Path Optimization Studies
    Test different APRS path configurations and document reception differences.

Antenna & Feedline Experiments

  • Antenna Comparison
    Evaluate two antennas under similar conditions to quantify performance differences.

  • Polarization Effects
    Compare vertical vs horizontal signal reception.

  • Feedline Loss Measurement
    Measure the impact of coaxial cable length and type on signal strength.

Strange Signals Log

A running record of unusual or unidentified signals encountered during monitoring.

Example Entry:

  • Frequency: 145.825 MHz
  • Date: YYYY-MM-DD
  • Description: Short digital bursts at regular intervals
  • Hypothesis: Possible ISS APRS packets
  • Next Step: Attempt decoding and compare with expected satellite passes

  • Long-Distance VHF Challenge
    Maximize VHF range using minimal power and optimized antennas.

  • Full Satellite Telemetry Analysis
    Track multiple satellites, decode telemetry, and analyze orbital behavior.

  • RF Noise Mapping
    Conduct a large-scale survey of RF noise sources and classify them.

  • Custom Digital Mode Development
    Implement a microcontroller-based digital transmission system, measure reliability and reach.

  • Oscillator Lab (Applied)
    Compare multiple oscillators for stability, frequency drift, and phase characteristics in RF context.