RelayStation Central

Stations

Active Tags

Locked Tags

Total Events

Station Map

Stations 1

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Active Tags (Confirmed — 3+ detections)

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Station Dashboard Ranked by total detections

Live Activity Feed

Waiting for detections...

Range Test Comparison

Start field test sessions to see range comparisons

Active Tags (Confirmed — 3+ detections)

Confirmed Active

Locked

Stations Reporting

Frequency	Station	Location	Signal	Confidence	Detections	First Seen	Last Seen	Status	Actions
No active tags detected in the last 24 hours

Tag Map

Tags shown at detecting station location. Circle size = signal strength.

Solo Range Test

SETUP

Station

Target Frequency

Station Location (Reference Point)

Station GPS coords (reference for distance)

Environment

Antenna

Waypoint Guidance

Recommended minimum: waypoints

GPS requires HTTPS. Use manual coordinates

GPS -- --

Distance

meters

Signal

Bearing

degrees

Detections

last 10s

0 / 8 waypoints need more

#	Distance	Signal	Det Rate
Walk away from station and tap "Log Waypoint"

Active Sessions

Total Waypoints

Test Session

Session Name

Station

Antenna Type

Height (m)

Azimuth (deg)

Environment

Notes

Live Signal Monitor

Start a test session to see live data

Range Test Waypoints

Name	Distance	Bearing	Avg Signal	Detection Rate
No waypoints logged yet

Session History

Session	Station	Started	Status	Actions
No test sessions yet

📡

Push Frequencies

Sync whitelist to all stations

🗑

Clear All Tags

Mark all active as retrieved

🗃

Delete Retrieved

Permanently remove retrieved tags

🔧

Recalibrate All

SDR gain calibration on all stations

Detection Pipeline

IQ Samples → Welch PSD → 13 Channels → Power Floor → Whitelist → Pulse Count → Tag Lock

Scan Range

151.19–151.45 MHz

Channels

13 × 20 kHz

Lock Threshold

10+ pulses, 90%+

Freq Sync

Auto ≤ 60s

Station registered! Add this to your Pi's config.ini:

Station Location

Click on the map to place your station pin

Latitude

Longitude

Registered Stations

Station ID	Location	Coordinates	Status	Created	Commands
elkhorn-radio-shack	Elkhorn Radio Shack	36.8186, -121.7363	offline	2026-02-11 05:46:20

Tag Frequency Whitelist

Tags matching these frequencies appear on the dashboard. Changes auto-push to all connected stations within 60 seconds. Valid range: 151.190 – 151.450 MHz

Frequency (MHz)

Label (optional)

Frequency (MHz)	Label	Added
151.192 MHz	test-tag-192	2026-02-11 06:37:13
151.322 MHz	test-tag	2026-02-11 06:37:05
151.370 MHz	Axy-370	2026-02-12 01:25:28
151.401 MHz	Axy-401	2026-02-12 01:24:47

Distance Model Parameters

VHF tag signal propagation model based on path loss formula.

Transmit Power (dBm)Typical VHF collar: 5-15 dBm

Antenna Gain (dBi)RTL-SDR stock antenna: ~2 dBi

Path Loss ExponentFree space: 2.0 | Forest: 3.5-4.0

Reference Distance (m)

Frequency (MHz)

Distance Calculator

Received Signal Strength (dB above noise)

Estimated Distance

-- m

Range: -- to -- m

Signal Guide

> 25 dB: Very Close (< 50m)

20-25 dB: Close (50-150m)

15-20 dB: Medium (150-400m)

10-15 dB: Far (400m-1km)

< 10 dB: Very Far (> 1km)

Active Tags with Distance Estimates

Frequency	Station	Signal (dB)	Est. Distance	Confidence	Status
No active tags

Total Detections

Retrieved Tags

Active Tags

Show Retrieved

Time	Frequency	Station	Signal	Confidence	Status
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Retrieved Tags

Frequency	Station	First Seen	Last Seen	Total Detections
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Time	Station	Level	Message
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