CW BUNKER HUNTER by M0ICR – USER GUIDE 

QUICK START

1. Hit the POWER switch 
2. Choose your tool MODE from the dropdown
3. Tune around with your mouse or keyboard
4. Copy those callsigns!

THREE MODES TO CHOOSE FROM

PRACTICE MODE

Just listen and learn! The decoder shows you everything in real-time. No pressure, no scoring – perfect for getting your ear in. Watch the callsigns appear as labels above the signals when decoded.

CALLSIGN GAME

Ready to test yourself? Type in just the callsign. You get 3 tries:
– 1st try = 10 points
– 2nd try = 5 points
– 3rd try = 2 points

BUNKER HUNTER

The ultimate challenge! Copy the callsign AND all the bunkers (like B/G-1234).
Points: 1 for callsign + 1 per bunker. Partial credit given!
Example: M0ICR B/G-1000 B/G-0234 B/G-2891

TUNING CONTROLS

CLICK the panadapter to jump to a frequency
SCROLL the mouse wheel for fine tuning (100 Hz steps)
< key = tune DOWN 100 Hz
> key = tune UP 100 Hz

TIP: The orange line shows where you’re tuned!

THE CONTROLS

QSB – Signal fading (makes it harder!)
NOISE – Background static (realistic!)
DECODER – Shows decoded text (Practice mode only)
POWER – Turn it all on/off

DIFFICULTY LEVELS (Game modes only)
– Beginner: 12 WPM, strong signals, no fading
– Intermediate: 18 WPM, mixed signals
– Advanced: 25 WPM, weak signals, QSB enabled

THE DISPLAY

GREEN callsign labels appear above signals you’ve decoded
S-METER shows signal strength
FREQUENCY shown in MHz (e.g., 7.025.3)
DECODED TEXT displays what you’ve copied
SCORE shows your points and accuracy (game mode)

PRO TIPS

In Practice mode, the decoder is VERY forgiving – if you can hear it, it’ll decode it!
Signals last 1-4 minutes before changing
In Bunker Hunter, bunkers can be typed in ANY order
Look for the cyan signal spikes on the panadapter
Weak signals at the edge are worth the challenge!

CHALLENGE YOURSELF

Start with Practice → Move to Callsign Game → Master Bunker Hunter!

Each station sends: CQ UKBOTA DE (callsign) (bunkers)
Example: CQ UKBOTA DE G3XYZ B/G-0042 B/G-1337 B/G-2999

UNDERSTANDING THE TRANSMISSION

CQ UKBOTA = Calling all UK Bunkers On The Air
DE = “from” in morse-speak
(callsign) = The operator’s callsign
B/G-#### = Bunker reference (0001-3000)

Have fun and 73!
– M0ICR