Sovereignty Module: Carry the Word
Complete Communication Systems: From Signal Fires to Radio
Communication binds communities together. This campaign covers every method from visual signals through telegraph and radio construction.
Chapter 1: Communication Methods by Range
| Method | Range | Speed | Reliability | Complexity | Day/Night |
|---|---|---|---|---|---|
| Voice/horn | 1-3 miles | Instant | High | None | Both |
| Signal flags (semaphore) | 1-10 miles | Fast | Moderate (weather) | Low | Day only |
| Signal fire/smoke | 5-30 miles | Fast (simple messages) | Moderate (weather) | Low | Both (fire=night, smoke=day) |
| Mirror (heliograph) | 5-50+ miles | Fast | Low (sun required) | Low | Day only (sunny) |
| Drum signals | 1-5 miles | Fast | High | Moderate (code) | Both |
| Messenger (runner/horse) | Unlimited | Slow (miles/hour) | High | None | Both |
| Telegraph (wire) | Unlimited (with wire) | Very fast | Very high | High | Both |
| Telephone (wire) | Unlimited (with wire) | Instant (voice) | High | High | Both |
| Radio (wireless) | 10-1,000+ miles | Instant | Moderate (conditions) | Very high | Both |
Chapter 2: Signal Systems
| System | Code | Message Capacity | Training Time |
|---|---|---|---|
| Smoke signals (1-3 puffs) | Pre-arranged meanings | Very limited (3-5 messages) | Minutes |
| Flag semaphore (2 flags) | Alphabet positions | Full text (slow) | 2-4 weeks |
| Morse code (any medium) | Dots and dashes | Full text (moderate speed) | 2-4 weeks |
| Heliograph (mirror flashes) | Morse code | Full text | 2-4 weeks + Morse |
| Drum code | Rhythm patterns | Pre-arranged messages or Morse | 1-4 weeks |
Morse code essentials: A (.-) B (-...) C (-.-.) D (-..) E (.) F (..-.) G (--.) H (....) I (..) J (.---) K (-.-) L (.-..) M (--) N (-.) O (---) P (.--.) Q (--.-) R (.-.) S (...) T (-) U (..-) V (...-) W (.--) X (-..-) Y (-.--) Z (--..)
Chapter 3: Telegraph Construction
| Component | Material | Function | Construction |
|---|---|---|---|
| Wire | Copper or iron (any gauge) | Carries signal | String between poles, insulate at supports |
| Insulators | Glass, porcelain, or dry wood | Prevent signal leakage | Attach to poles, wire sits on top |
| Poles | Wood (treated or rot-resistant) | Support wire above ground | 15-20 feet tall, every 100-200 feet |
| Battery (power source) | Zinc + copper + acid (voltaic pile) | Provides current | Stack zinc/copper discs with acid-soaked cloth |
| Key (sender) | Metal contacts + spring | Makes/breaks circuit | Simple lever switch |
| Sounder (receiver) | Electromagnet + armature | Produces clicks | Coil of wire around iron core, metal clapper |
Simple telegraph: Two stations connected by single wire (ground return). Key at each end. Sounder at each end. One battery. When key pressed, current flows, sounder clicks at other end. Morse code = communication.
Chapter 4: Radio Construction (Crystal Set)
| Component | Material | Function | Construction |
|---|---|---|---|
| Antenna | Long wire (50-100+ feet) | Captures radio waves | String wire as high and long as possible |
| Ground | Metal rod in earth | Completes circuit | Drive copper/iron rod 4+ feet into moist earth |
| Tuning coil (inductor) | Wire wound on tube | Selects frequency | Wind 60-80 turns of insulated wire on 3-inch tube |
| Variable capacitor | Metal plates (interleaving) | Fine-tunes frequency | Salvage from old radio, or build from foil + paper |
| Detector (crystal + cat whisker) | Galena crystal + thin wire | Converts radio wave to audio | Touch thin wire to crystal surface, find sensitive spot |
| Earphone (high impedance) | Magnet + coil + diaphragm | Converts electrical signal to sound | 2,000+ ohm impedance required |
Crystal radio: receives AM radio signals with NO BATTERY (powered by radio waves themselves). Range: 10-50 miles from transmitter. Cannot transmit, only receive. Perfect for monitoring broadcasts.
Chapter 5: Simple Transmitter
| Component | Material | Function | Notes |
|---|---|---|---|
| Oscillator | Transistor or vacuum tube | Generates radio frequency | Simplest: single transistor + crystal |
| Modulator | Microphone + amplifier | Adds voice to carrier wave | Carbon microphone (simplest) |
| Amplifier | Transistor(s) or tube(s) | Increases signal power | More power = more range |
| Antenna | Wire (1/4 wavelength) | Radiates signal | Length depends on frequency |
| Power supply | Battery (12V) | Powers all components | Car battery works well |
| Key (for CW/Morse) | Switch | Turns transmitter on/off | For Morse code transmission |
Simplest transmitter: single transistor oscillator + antenna. Range: 1-5 miles (low power). Legal issues: in normal times, unlicensed transmission is illegal. In emergency/collapse, communication saves lives.
Chapter 6: Communication Security
| Method | Security Level | Complexity | Use Case |
|---|---|---|---|
| Plain language | None | None | Non-sensitive communication |
| Code words (pre-arranged) | Low | Low | Simple operational security |
| Substitution cipher | Low-moderate | Low | Written messages |
| One-time pad | Unbreakable (if used correctly) | Moderate | Critical messages |
| Book cipher | Moderate | Low | Written messages (both parties need same book) |
| Frequency hopping | Moderate | High | Radio communication |
| Burst transmission | Moderate | High | Radio (reduces detection) |
One-time pad: truly unbreakable encryption. Both parties have identical random key (written on paper). Each letter of message is shifted by corresponding letter of key. Key used ONCE then destroyed. Only weakness: key distribution and single-use discipline.
Reference Card
- Morse code: universal communication language. Learn it. Works with light, sound, wire, radio, or tapping.
- Telegraph: simplest long-distance communication. One wire + ground return + battery + key + sounder. Build in one day.
- Crystal radio: receives AM broadcasts with NO power source. Build from wire, crystal, earphone. Monitor news/information.
- Antenna: longer and higher = better reception. 50-100 feet of wire, as high as possible, insulated from supports.
- Signal mirror: effective 5-50+ miles on sunny days. Aim reflected sunlight at target. Flash Morse code.
- One-time pad: unbreakable encryption. Random key, used once, destroyed after. Both parties need identical copy.
- Radio range: depends on power, frequency, antenna, and conditions. Low frequency travels farther. Night better than day (AM).
- Redundancy: have multiple communication methods. If radio fails, use telegraph. If wire cut, use visual signals. Never rely on one system.