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How to Program a Police Scanner
Programming a scanner just means telling it which systems and talkgroups to listen to — and modern radios make that as easy as typing your ZIP code. There are three routes, from zero-effort to full manual control, plus GopherTrunk’s config-file approach if you’re running an SDR instead.
Key takeaways Route 1 — ZIP code: HomePatrol-database Unidens (BCD436HP, BCD536HP, SDS100, SDS200) load nearby systems from a ZIP — no frequency tables. Route 2 — software: Uniden Sentinel (or Whistler EZ-Scan) builds favorites on a PC → SD card. Route 3 — manual: enter frequencies and talkgroups by hand. Source data: RadioReference. GopherTrunk uses a config file / import instead.
First: get the data (RadioReference)
Every route needs the same raw material — your county’s systems, frequencies, and talkgroups. The standard source is RadioReference.com: find your state → county, and note the system type, control-channel frequencies, talkgroup IDs, and mode (P25, DMR, NXDN). Browsing is free; a small premium membership unlocks bulk downloads that Sentinel can import automatically, saving a lot of typing.
Know the system before you program it. Whether it’s trunked, digital, or simulcast determines what you enter — start with how police scanners work and the buying guide.
Route 1: ZIP code (easiest — HomePatrol database)
The simplest scanners to program are Uniden’s HomePatrol-database models: BCD436HP, BCD536HP, SDS100, SDS200, and the HomePatrol-2. They ship with a nationwide database baked in.
- Enter your location. Choose the ZIP-code/location setup and type your ZIP (or let GPS set it on models that support it).
- Pick a range. Set how far out to monitor (e.g. your city vs the whole metro).
- Let it load. The scanner pulls the nearby systems and talkgroups from its database and starts scanning immediately.
- Trim it. Use avoid/lockout to hide agencies you don’t care about.
That’s it — no frequency tables, no talkgroup IDs typed by hand. This is why these radios are the beginner recommendation.
Check BCD436HP price on Amazon →
Route 2: software + SD card (Sentinel / EZ-Scan)
For more control — custom favorites lists, edited talkgroup names, quick database updates — program on a PC and copy to the scanner:
- Uniden Sentinel (free) for the 436/536HP and SDS series. It keeps the HomePatrol database current, builds Favorites Lists, and writes them to the radio’s SD card over USB.
- Whistler EZ-Scan for the TRX-1 / TRX-2, which include DMR/NXDN.
Typical flow: update the database → import your county (or a RadioReference download) → curate which systems and talkgroups you keep → save to SD → reinsert in the scanner. This is the sweet spot for most enthusiasts: database convenience with hand-tuned lists.
Route 3: manual frequency and talkgroup entry
Older or value radios (BCD996P2, BCD325P2, BC125AT) are programmed channel by channel — by hand or with free third-party software.
Conventional (analog or digital):
- Create a system/bank.
- Enter each frequency and, for digital, the mode.
- Name the channels.
Trunked:
- Create the trunked system and set its type (P25, DMR, NXDN).
- Enter the control-channel frequencies (or all site frequencies).
- Add the talkgroup IDs you want, with names.
- For DMR/NXDN, add the color code or RAN/NAC where required.
The scanner then reads the control channel and follows those talkgroups. Third-party software (e.g. ARC/ProScan for Uniden) makes bulk entry far less tedious than the keypad.
Route comparison
| Route | Effort | Control | Best for | Radios |
|---|---|---|---|---|
| ZIP code | Lowest | Low | Beginners, fast start | 436/536HP, SDS, HomePatrol-2 |
| Sentinel / EZ-Scan | Medium | High | Enthusiasts, curated lists | 436/536HP, SDS, TRX |
| Manual entry | High | Full | Value radios, precise setups | 996P2, 325P2, BC125AT |
| GopherTrunk | Config file | Full + logging | PC/SDR users | RTL-SDR |
How GopherTrunk does it instead
Running an SDR with GopherTrunk? There are no on-radio menus — you edit a config file (or use the guided setup) and point it at a system:
- Give it the control channel. Set the system’s control-channel frequency and type; GopherTrunk finds the grants and follows the calls automatically.
- List talkgroups — or don’t. Name the talkgroups you care about, or let it log everything and sort it out later. Every call is recorded and timestamped.
- Import instead of retype. Bring in site and talkgroup data rather than entering it by hand — see the import guide and downloads to get set up.
One config drives unlimited talkgroups and multiple systems at once, with a web console to manage it. The trade-offs vs a hardware scanner are laid out in scanner vs SDR.
A note on encryption
No amount of correct programming makes an encrypted talkgroup audible. You can enter it perfectly and still get silence — AES can’t be decoded by any scanner or SDR. Program the clear talkgroups and don’t chase the locked ones.
Bottom line
Programming is just telling the radio what to listen to, and the modern easy path is a ZIP code. Use RadioReference for the data, then pick your route: ZIP-code loading on a 436/536HP or SDS, curated lists via Sentinel/EZ-Scan to an SD card, or full manual entry on a value radio. On an SDR, skip the menus entirely — point GopherTrunk at a control channel, import your talkgroups, and it records every call. Just remember that no programming route unlocks encryption.
Frequently asked questions
How do I program a police scanner?
Three routes. Easiest: enter your ZIP code on a HomePatrol-database Uniden (BCD436HP, BCD536HP, SDS100, SDS200) and it loads nearby systems automatically. Better control: use Uniden Sentinel (or Whistler EZ-Scan) on a PC to build a favorites list and copy it to an SD card. Full control: enter frequencies and talkgroups by hand from RadioReference.
How do I program a scanner by ZIP code?
On a HomePatrol-based Uniden, choose the location/ZIP setup, type your ZIP or let GPS set it, pick a monitoring range, and the built-in database loads the nearby systems and talkgroups. No frequency tables required. You can then trim which agencies you hear.
What is Uniden Sentinel?
Sentinel is Uniden’s free PC software for the 436/536HP and SDS scanners. It keeps the HomePatrol database updated, builds and edits Favorites Lists, and writes them to the scanner’s SD card over USB. Whistler’s equivalent for TRX radios is EZ-Scan.
Where do I get frequencies and talkgroups?
RadioReference.com is the standard source. It lists systems, frequencies, talkgroup IDs, and modes for your county. A premium membership lets Sentinel import that data in bulk instead of typing it in manually.
How do I program a trunked system manually?
Create the system, enter its control-channel frequencies (or all site frequencies), set the system type (P25, DMR, NXDN), then add the talkgroup IDs you want with their names. The scanner reads the control channel and follows those talkgroups. For DMR/NXDN you may also need the color code or RAN/NAC.
Does GopherTrunk need programming like a scanner?
GopherTrunk uses a config file instead of on-radio menus. You point it at a system’s control-channel frequency and list the talkgroups (or let it log everything), and it decodes and records automatically. You can import site and talkgroup data rather than typing it in — see the import page.