Welcome to VK7AAL, a personal radio blog exploring radio scanning, monitoring and amateur radio from Launceston Tasmania. This site documents what I hear, test, and learn across the VHF and UHF bands, with a focus on receivers, antennas, low-cost experiments and the home of RadioFreakDB. All content reflects my personal interests and monitoring. This is shared for hobby, learning, and technical curiosity purposes only.
Tuesday, June 30, 2026
Saturday, May 30, 2026
Unoffical XRS Config Editor
A custom developed HTML based config file editor for the GME(c) XRS UHF CB Radio series.
This provides full configuration of the GME(c) XRS UHF CB Radio, via a simple web interface, which can be used on a Windows PC / Laptop or Chromebook. This open up the options for making configuration changes and also allows much easier setting of some options, some of which are not included in the XRS Connect app.
Please note:
* This will only allow the config file to be edited and updated, you MUST still use the XRS Connect app to push the changes to the XRS UHF CB radio itself.
* This web app has been tested with the XRS-660 only, but it should be compatible with all UHF CB radios in the XRS series.
* This will only allow the config file to be edited and updated, you MUST still use the XRS Connect app to push the changes to the XRS UHF CB radio itself.
* This web app has been tested with the XRS-660 only, but it should be compatible with all UHF CB radios in the XRS series.
Current Version: V3.
Thursday, May 28, 2026
Sunday, May 24, 2026
Portable UHF Band Monitoring Kit - May 2026
There is something satisfying about having a complete monitoring setup packed into a single rugged case, ready to grab at a moment’s notice. Over the years I have experimented with radio bags, camera cases, toolboxes, and hard cases trying to find the right balance between portability, protection, and practicality for UHF monitoring. This latest setup is probably the closest I have come to the “ideal” portable kit.
The Goal
The idea behind this kit is simple:
Compact and portable
Fast deployment
Protected equipment
Enough flexibility for serious UHF monitoring
Minimal clutter
Whether I am doing casual monitoring around Launceston, logging unknown users, checking repeater activity, or simply exploring the band while out and about, this kit gives me everything I need in one place.
The Case
The foundation of the setup is a foam-lined hard case. After trying softer radio bags and tool cases over the years, I have found hard cases work best for portable radio operations. The foam insert keeps everything secure and prevents radios and accessories from sliding around during transport. It also means I can quickly see if anything is missing before leaving home. The egg-shell foam in the lid helps protect antennas and controls from pressure damage.
The Radios
GME XRS Handheld: The GME XRS-660 handheld UHF CB is the centrepiece of the monitoring kit. From a monitoring perspective, the XRS series is extremely capable:
Excellent RF performance
Fast scanning
Zone support
GPS capability
Audio recording
Bluetooth app programming
Up-scan skip feature
RX-only channel support
One feature I particularly like is the ability to separate monitoring channels into dedicated scan groups. For example:
Scan A = RX-only monitoring frequencies
Scan B = RX-only and UHF CB channels
Scan C = standard UHF CB channels
This makes it easy to move between casual listening and more serious monitoring work.
The audio recorder is another surprisingly useful feature. Being able to replay transmissions later helps when identifying users, callsigns, or locations.
Baofeng UV-17L: This second radio acts as either:
A dedicated monitoring receiver
Backup communications radio
Experimental receiver
Comparison receiver
Having two radios available is extremely useful when tracking activity across multiple channels or comparing signal strength and audio quality between radios.
Dual-radio monitoring also allows one radio to remain locked onto a busy frequency while the other continues scanning.
Charging and Power
A portable kit is only useful if everything stays charged. Inside the case are:
Desktop charger
Power supply
USB charging leads
Keeping all charging accessories permanently inside the kit means there is less chance of forgetting something important before a trip.
Accessories
Multitool: A multitool is one of those items that constantly proves useful during radio work:
Antenna adjustments, Opening battery compartments, Tightening connectors, General repairs, Cutting cable ties. It earns its place in the kit every single time.
Cable Container: The small container holds:
USB leads, Adapters, Spare connectors, Small accessories.
Using a separate container stops cables from tangling throughout the case and keeps everything organised.
Why Portable Monitoring Matters
Portable UHF monitoring changes the experience completely compared to monitoring from home.
Being mobile allows you to:
Discover new users
Identify local business channels
Map repeater coverage
Investigate interference
Monitor temporary event channels
Explore propagation conditions
Log unidentified frequencies
Some of the best discoveries happen while simply driving around or stopping at random locations with a handheld radio.
Practical Lessons Learned
After years of experimenting with portable radio setups, a few things stand out:
Keep It Simple: The more complicated the kit becomes, the less likely it is to be used regularly.
Protect the Radios: Portable radios take a surprising amount of abuse. A good case dramatically extends their lifespan.
Organisation Matters: Dedicated spots for every item make setup and pack-up much faster.
Two Radios Are Better Than One: Once you start using dual receivers for monitoring, it becomes difficult to go back to a single radio.
Final Thoughts
This portable UHF monitoring kit represents years of refining what actually works in the field. It is compact, practical, rugged, and flexible enough for everything from casual monitoring to serious UHF exploration. The best part is that it encourages experimentation. Grab the case, head somewhere interesting, start scanning, and see what turns up.
That is half the fun of radio monitoring.
Review - GME XRS-660 XRS™ Connect Handheld UHF CB Radio
The GME XRS Connect XRS-660 HandHeld UHF CB Radio is one of the more capable modern handheld UHF radios available for people who monitor known frequencies, not just the standard 80 UHF CB channels. While marketed primarily as a touring and 4WD radio, it also works surprisingly well as a dedicated UHF monitoring receiver thanks to its strong RF performance, flexible scanning options, and advanced software features.
General Overview
The XRS-660 is a 5-watt Australian-made handheld UHF CB radio with a large feature set built around the GME XRS platform. It combines traditional UHF CB operation with app-based programming, GPS functions, advanced scanning, and audio recording features.
For general users, it is a solid touring radio. For radio enthusiasts and UHF monitors, however, the real value is in how configurable the receiver and scan system are. It can be set up more like a commercial scanning radio than a simple CB.
The receive audio quality is excellent, the RF sensitivity is strong, and the radio performs very well in weak signal areas. Even in busy RF environments, the receiver remains clear and usable.
Features
Some of the main features include:
- 5W UHF CB operation
- Large easy-to-read display
- Bluetooth connectivity
- Android and iOS programming
- GPS location support
- Scan zones
- Multiple scan modes
- Audio recording
- Selcall support
- CTCSS/DCS support
- Firmware updates via app
- External speaker and accessory support
The radio feels more like a hybrid between a commercial UHF and a modern connected radio than a traditional CB.
Features That Make It Excellent for UHF Monitoring
Audio Recorder
One of the standout features for monitoring is the built-in audio recorder. This is incredibly useful for logging activity, replaying weak or fast transmissions, and checking unidentified signals later.
For monitoring known channels or documenting UHF activity, the recorder becomes one of the most valuable features of the radio.
Zones
Zones are where the XRS-660 really shines for monitoring.
Instead of treating the radio as just 80 UHF CB channels, you can organise frequencies into logical groups. This makes the radio far more practical for serious UHF listening.
For example:
- Scan A = UHF RX Only
- Scan B = UHF RX + UHF CB
- Scan C = UHF CB Only
This allows quick switching between different monitoring styles without constantly reprogramming channels.
Once configured properly, the zone system is extremely powerful.
Up Scan Skip
A surprisingly useful feature is the temporary scan skip.
When scanning, pressing the up button skips the current frequency for roughly 30 seconds. This is excellent for avoiding long conversations or noisy channels while continuing to monitor the rest of the scan list.
Small feature, but very useful in real-world monitoring.
RF Performance
The RF performance is excellent.
The receiver is sensitive, clear, and handles weak signals very well. Compared to many basic CB radios, the XRS-660 feels much closer to commercial-grade equipment in receive quality.
For monitoring local business, transport, farm, event, or other licensed UHF users, the radio performs extremely well.
Android / iOS Programming
The app-based programming is one of the biggest advantages of the XRS platform.
Programming large channel lists manually on a radio keypad is normally painful, but using the app makes adding frequencies, zones, names, and scan lists much easier.
For monitoring enthusiasts who constantly update frequency lists, this is a major benefit.
GPS Features
The built-in GPS functions are also useful for monitoring.
Being able to associate received communications with locations is excellent for logging and identifying repeaters, mobile users, or coverage areas.
For people who travel while monitoring, this adds another layer of usefulness beyond basic CB functionality.
Multiple Scan Modes
The flexible scan system is one of the radio’s best features.
Being able to maintain different scan profiles for different purposes makes the radio much more adaptable than standard UHF CB radios.
Instead of one generic scan mode, you can build specialised monitoring setups depending on what you want to listen to.
Issues and Weak Points
Android Software Bugs
The biggest issue is the Android programming software.
On multiple Android devices, adding a frequency sometimes overwrites another existing frequency unexpectedly. This can become frustrating when maintaining larger channel databases.
The radio itself is stable, but the Android app still feels buggy in places.
Proprietary Accessory Connector
The radio uses a custom accessory connector, which limits compatibility with standard audio accessories. You cannot simply plug in normal earphones or generic accessories without adapters or specific compatible equipment.
For monitoring users who often use earpieces or recording devices, this can be annoying.
Complexity
The XRS-660 is powerful, but not simple.
To fully utilise zones, scan modes, receive-only channels, and advanced configuration options takes time and experimentation.
People expecting a basic “turn on and use” CB may find it overwhelming initially.
Keypad Programming
Programming directly from the radio keypad is possible, but involves a large number of button presses and menu navigation.
For occasional changes it is acceptable, but for serious monitoring setups the app is almost essential.
Overall
The GME XRS Connect XRS-660 UHF CB Radio works exceptionally well as a UHF monitoring radio, especially for users monitoring known frequencies rather than searching unknown spectrum activity.
Its excellent receive performance, flexible zones, advanced scanning, audio recording, and GPS features make it far more capable than a standard CB radio for monitoring purposes.
The biggest drawbacks are the buggy Android software, proprietary accessory connector, and the learning curve required to fully understand the programming system.
Despite those issues, once configured properly, the XRS-660 becomes an extremely capable and enjoyable UHF monitoring platform with features rarely found in consumer UHF radios.
Friday, May 22, 2026
UHF Band Analysis (400–512 MHz) - A Focused Spectrum Mapping Initiative
📡 Introduction
The 400–512 MHz slice of the UHF spectrum represents one of the most densely utilized and operationally critical RF ranges in modern communications. This band includes:
- UHF CB (Citizen Band)
- Commercial and business radio systems
- Public safety allocations (TASGRN)
- Amateur radio (70 cm band overlap)
- Telemetry and digital data systems
With this post, RadioFreakDB introduces a refined focus:
To systematically document, analyze, and catalogue every observable signal within the 400–512 MHz range.
Instead of broad-spectrum monitoring, this effort concentrates on a high-value operational band, enabling deeper insights and more precise classification.
🎯 Why Focus on 400–512 MHz?
1. High-Density Spectrum Usage
This frequency segment is heavily populated due to its ideal characteristics:
- Reliable short-to-medium range propagation
- Strong building penetration
- Efficient antenna sizing
As a result:
- Frequencies are reused frequently
- Multiple services overlap geographically
- Digital and analog coexist in complex patterns
Key takeaway: This band offers one of the clearest views into real-world spectrum congestion and coexistence.
2. Critical Communication Services
The 400–512 MHz range supports essential services:
| Category | Examples |
|---|---|
| UHF CB | 476–477 MHz (AU allocation) |
| Business Radio | Logistics, retail, construction |
| Public Safety | TASGRN |
| Amateur Radio | 430–450 MHz (70 cm band) |
| Digital Systems | DMR, P25, NXDN, telemetry |
Focusing on this range allows:
- Cross-service comparisons
- Detection of operational patterns
- Identification of under-documented users
3. Rich Digital Signal Environment
Modern usage in this band shows:
- Increasing dominance of digital radio standards
- Continuous control channels and burst transmissions
- Hidden infrastructure supporting logistics and monitoring systems
Many signals:
- Are not listed in public databases
- Remain unidentified without structured logging
🗺️ Where Monitoring Takes Place
Monitoring Environments
To ensure accurate capture of activity, monitoring spans:
- Urban high-density RF environments
- Suburban mixed-use zones
- Elevated or line-of-sight observation points
This enables:
- Detection of both local and distant transmitters
- Differentiation between simplex and repeater systems
Frequency Scope
The project targets continuous scanning across:
400 MHz → 512 MHz🔍 What Gets Documented
Every detected signal is captured with structured metadata to support analysis and long-term tracking.
Core Data Fields
- Frequency (MHz)
- Band classification
- Signal type (Analog / Digital / Unknown)
- Signal strength (RSSI)
- Timestamp and duration
- Modulation (if identifiable)
- Activity patterns and recurrence
📻 Signal Categories Within 400–512 MHz
1. UHF CB (Citizen Band)
- Located at 476–477 MHz (Australia)
- Narrowband FM voice channels
- High activity from:
- Transport operators
- 4WD/off-road groups
Observation: Predictable channel usage with periodic peak activity.
2. Business & Commercial Radio
Covers a wide range of licensed users:
- Warehousing and logistics
- Construction and security
- Retail and event coordination
Typical characteristics:
- Analog FM still present
- Rapid shift to DMR and NXDN digital systems
- Frequent repeater use
3. Amateur Radio (70 cm Band)
- 430–450 MHz range
- Mixed usage:
- Repeaters (voice and digital)
- Simplex contacts
- Experimental digital modes
Acts as:
- A testing ground for new technologies
- A predictable reference segment within the band
4. Data & Telemetry Systems
Includes:
- SCADA networks
- Remote monitoring systems
- Control channels for trunked systems
Signal traits:
- Burst transmissions
- Narrowband or structured digital carriers
- Often continuous low-duty-cycle activity
5. Unknown / Unidentified Signals
A key focus area:
- Unclassified digital bursts
- Non-standard modulation patterns
- Intermittent or irregular transmissions
These are:
- Logged for pattern analysis
- Flagged for future identification
- Correlated across time and location
📊 Initial Results & Observations
1. Persistent Background Activity
Even unused-looking frequencies often reveal:
- Short telemetry bursts
- Low-power digital carriers
- Control signals
Conclusion: True inactivity in this band is rare.
2. Digital Dominance Increasing
Across 400–512 MHz:
- Digital voice systems are expanding
- Analog FM is gradually declining in commercial use
- Mixed-mode coexistence remains common
3. Frequency Reuse Is Widespread
Identical frequencies appear:
- Across different industries
- In separate geographic regions
This demonstrates:
- Efficient but complex spectrum allocation
- Increased potential for interference
4. Hidden Infrastructure
Monitoring reveals:
- Low-power repeaters not publicly listed
- Fixed telemetry nodes
- Persistent control channels
These systems form a largely invisible backbone of RF activity.
RadioFreakDB Integration
All captured data feeds into RadioFreakDB, enabling:
- Structured logging and tagging
- Frequency activity tracking over time
- Exportable datasets for external analysis
📤 Data Export Strategy
Regular outputs include:
- Daily activity summaries
- Per-frequency usage logs
- Unknown signal watchlists
- Sub-band utilization reports
🚀 Future Enhancements
Planned improvements include:
- Automated modulation detection
- Machine learning-assisted classification
- Signal fingerprinting and clustering
- Heatmaps of band usage
- Real-time monitoring dashboards
📢 Final Thoughts
The 400–512 MHz UHF segment provides a uniquely dense and diverse RF environment, making it ideal for structured spectrum analysis.
By narrowing focus to this range, RadioFreakDB can deliver:
- Higher-resolution insights
- Better signal classification accuracy
- More meaningful long-term trends
This is not just scanning — it’s building a living, evolving dataset of one of the most important radio bands in use today.
📡 Upcoming posts will explore:
- Deep dives into unidentified signals
- Digital mode recognition techniques
- Regional usage comparisons
- Automated scanning pipelines within 400–512 MHz
Wednesday, April 29, 2026
RadioFreakDB - Build 28042026
An Offline Radio Monitoring Logger Built by a Radio Tragic, for Radio Tragics
RadioFreakDB is a local-only, offline radio monitoring logger database, designed for real-world monitoring across HF, VHF, UHF, and SHF. It runs entirely in your browser, stores data locally, and saves everything to a single portable database file that you control. It is written in basic HTML, with some CSS and JavaScript.
Download Link - https://drive.google.com/file/d/1atydTFMAHxz5yJspzxtkDHhdlmSj3rGy/view?usp=drive_link
Sunday, April 26, 2026
Stealth Radio Sling Bag – A Practical Portable Setup
I recently picked up this understated little sling bag on clearance for $19 (down from $30), and it’s quickly become one of those “why didn’t I do this sooner?” upgrades to my portable radio setup.
Why I Needed It
With me doing more portable sessions lately, I needed something simple and practical to carry a couple of radios, antennas, and a few accessories. Previously, it was a mix of cases and juggling gear in my hands, not ideal, especially when moving around.
The big driver here is mobility. My knees haven’t been great, and having both hands free while walking, whether it’s for balance, climbing, or just managing uneven ground, is genuinely important. A sling bag keeps everything close, accessible, and out of the way.
The Setup Inside
Inside, I added a plastic container to give the radios some structure and protection. Without it, everything would just knock around, not great for gear that isn’t exactly cheap.
That said, this part didn’t go smoothly…
The “Modification Phase” (a.k.a. making it fit)
Because the bag and the container came from different shops, they didn’t exactly agree with each other. The container was just a bit too thick, and the zip wouldn’t close.
So… out came the hacksaw.
I cut the container down and reassembled it to about two-thirds of its original thickness. A few screws anchor it to the middle timber divider, and some tape holds the structure together. It’s not pretty, but it’s solid, nobody will see it once it is in the bag and most importantly, it works.
This little DIY hack turned what could have been a failed idea into a really functional setup.
How It Performs
After using it, I can say it’s ticking all the boxes:
- Hands-free carry: huge win for mobility and stability
- Low profile: doesn’t scream “expensive gear inside”
- Compact but practical: fits radios, antennas, and accessories
- Extra space: room for a snack, phone, and keys
- Encourages use: makes it easy to just grab and go
And that last point is probably the biggest one. Because it’s so easy to carry, I’m taking my radios out more often, which naturally leads to discovering new signals and monitoring opportunities.
Final Thoughts
This wasn’t about buying the perfect bag, it was about building something that works for how I actually operate. A cheap sling bag, a modified container, and a bit of problem-solving has resulted in a setup that’s practical, discreet, and genuinely useful.
Sometimes the best solutions aren’t off-the-shelf, they’re the ones you tweak to fit your own way of doing things.
The start of the build process.
About the point where I had worked out that it was too think and the hacksaw came out.
Added some bubblewrap and testing the fit for both radios. I needed it to be snug but not too tight.
With the middle divider in and getting the bubblewrap in place.
After adding the tape to help hold it all together. I did have to add some more tape inside to stop the bubblewrap moving when I took the radios in and out.
Top view, with everything in place.
Just a little bit of duct tape...
The bag from the front, looking low profile.
Top access to the radios and aerials.
Middle Pocket - Wire aerial, USB cables.
Multi-tool hidden in the pocket.
Battery Charger for AA batteries.
Ear Phones in the front pocket, also space for my phone and keys.
Video - Uniden Band Scope Feature
In this video, I demonstrate the Uniden BCD160DN band scope feature and how it can be useful for or hunting down new and interesting frequencies.
Friday, April 24, 2026
Sistema To Go Radio Case — Going Low Profile
There’s something deeply satisfying about creating a gear storage solution that’s both functional and minimal, not bulky, not overbuilt, just exactly what you need. Enter the Sistema To Go Radio Case, a humble but clever low-profile solution for radio operators, field techs, and anyone who likes to keep their communications tools tidy and ready.
Why a Low-Profile Case Matters
When you’re loading up for a field day, a commute, or even just shelf storage, bulk is the enemy. Traditional radio bags and padded gear cases are great, until you realize half the space is wasted. I wanted something that:
- Didn’t scream “expensive radio gear inside”
- Slept easily on a shelf or in a backpack
- Had modular compartments
- Was inexpensive and replaceable
The answer? A plastic Sistema To Go lunchbox style container.
What’s Inside the Case
Looking at the top view, the layout is simple but thoughtful:
Compartments & Layout
- Left Side:
A dedicated compartment perfectly sized for a battery charger and a couple of AA batteries. With the divider, the charger doesn’t shift, even when the case is jostled. - Center:
The main radio body (My Uniden BCD160DN) sits snugly on a foam pad. The foam also doubles as protection for the radio knobs and connectors. - Right Side:
Two round removable containers are ideal for storing antennas, cables, adapters, or small parts like spare connectors or ear buds. - Top Layer/Under-lid:
Bonus storage! A flat area under the lid can hold notes, frequency cheat sheets, or a small notebook.
Why This Works (and How You Can Replicate It)
1. Clean, Simple Organisation
No bulky tool bags or unnecessary pockets, everything has its place. The clear lid lets you visually confirm contents before opening.
2. Custom Fit Keeps Gear Safe
Foam padding under the main radio section and the dividers stop items from clanging together. Whether it’s a portable handheld or spare batteries, it all stays protected.
3. Inexpensive & Replaceable
If this case gets bumped around or left out in the field, it’s no big loss. You can replace it for under $10, compared to $100+ rugged cases.
Perfect For:
- Daily carry setups
- Field days and quick deploy bags
- Backpack insert for comms gear
- Minimalists who hate bulky cases
- Radio ops on a budget
Tips if You Want to Build One
- Use craft foam or shelf liner: Adds padding without bulk.
- Measure twice: Small variations in handheld sizes can mean the difference between a snug fit and a loose one.
- Label compartments: A small label makes finding what you need quicker.
- Add velcro strips: To secure loose cables or accessories.
Final Thoughts
The Sistema To Go Radio Case isn’t flashy. It doesn’t have foam-cut inserts straight from a factory. But that’s the point. It’s low-profile, practical, customizable, and most importantly functional.
Sometimes the best solutions are the simplest ones.
Uniden BCD160DN - Key Press Codes
These work by pressing and holding the listed keys, while you turn on the Uniden BCD160DN.
2 + 9 + HOLD = Factory Reset
HOLD + 3 = Set Contrast
HOLD + 5 = GPS Test
HOLD + 6 = Screen / Keypad Test. Screen shows what keys are pressed
E + 2 = Screen / Keypad Test. Screen shows what keys are pressed
Scan + 2 = GPS test
Scan + 3 = Screen / Keypad Test. Screen shows what keys are pressed
Scan + 4 = SRC Test - 144MHz
Scan + 5 = Band Scope Test - 40.43MHz
Scan + 6 = Tone Out Test
Scan + 8 = NWR-SAME Test - 162.400MHz
Scan + 9 = Backlight Test
Scan + ./No = Load Scan Test Data - Channels 1 - 25
L/O + 5 = NWR-SAME Test - 162.400MHz
L/O + 6 = Backlight Test
L/O + 7 = Air Search - 25KHz
L/O + 8 = Public Safety Search - VHF Low
Scan + 4 = SRC Test - 144MHz
Scan + 5 = Band Scope Test - 40.43MHz
Scan + 6 = Tone Out Test
Scan + 8 = NWR-SAME Test - 162.400MHz
Scan + 9 = Backlight Test
Scan + ./No = Load Scan Test Data - Channels 1 - 25
L/O + 5 = NWR-SAME Test - 162.400MHz
L/O + 6 = Backlight Test
L/O + 7 = Air Search - 25KHz
L/O + 8 = Public Safety Search - VHF Low
Wednesday, April 15, 2026
Thursday, April 9, 2026
Wednesday, April 8, 2026
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