The Ritron RQT-451 QuickTalk is a UHF wireless voice alert transmitter designed to send custom recorded messages over compatible business-band two-way radios when a switch or sensor changes state. It is a practical solution for monitoring doors, alarms, equipment status, temperature, liquid levels, and emergency call buttons without running a full intercom or networked monitoring system.
Why Businesses Use the RQT-451
Transmits voice alerts over existing UHF business radios
Supports up to 4 switch or sensor inputs
Lets you record custom voice messages for each input
Works for panic buttons, door alarms, power loss, temperature alerts, and more
Battery powered for flexible installation, with optional external power support
PC programmable for tailored alert behavior and scheduling
Simple Use Cases
Call Button / Panic Alert
Connect a push button and transmit a custom alert directly to radio-equipped staff when help is needed.
Door & Gate Monitoring
Monitor open doors, propped doors, tool cribs, or restricted access points with instant voice notification.
Power Fail Notification
Use external power with battery backup and get an automatic radio alert if power is lost.
Temperature & Liquid Level Alerts
Connect compatible sensors to monitor environmental conditions and trigger custom voice alerts.
Key Features
UHF 450–470 MHz business-band operation
Narrowband only (12.5 kHz)
4 programmable inputs
24 seconds total voice message allocation
Compatible with contact closure, analog voltage, and terminated alarm inputs
CTCSS / Quiet Call, DCS / Digital Quiet Call, DTMF ANI, and Selcall support
Onboard microphone and PC-based programming
Typical range of about one-half mile to a handheld radio with the standard antenna
6 AA battery operation with optional 12–18 VDC external power
Technical Specifications
Model
RQT-451
Band
UHF
Frequency Range
450–470 MHz
Operation
Analog, narrowband only (12.5 kHz)
Channels
4
RF Power Output
120 mW
Inputs
4 momentary, latching, analog voltage, or resistance inputs
Voice Message Length
24 seconds total for all voice messages
Battery
6 AA batteries
External Power
12–18 VDC
Antenna Connector
BNC, 50 Ohms
Housing
Polycarbonate
Dimensions
7.57" x 5.07" x 2.65"
Installation Notes
Mount as high as practical for best radio coverage
Avoid mounting directly to large metal structures when possible
Keep the antenna vertical
Seal the antenna connection for outdoor installations
Test programming and coverage before permanent mounting
Frequently Asked Questions
What does the Ritron RQT-451 do?
It sends recorded voice alerts over compatible UHF business-band two-way radios when a switch or sensor changes state.
How many devices or inputs can it monitor?
The RQT-451 supports up to 4 programmable inputs, each of which can have its own message and settings.
Can I record my own custom messages?
Yes. You can record voice messages using the onboard microphone or load audio through the Ritron programmer setup.
Does it require AC power?
No. It can run on 6 AA batteries, and it also supports external 12–18 VDC power for fixed installations.
What kinds of alerts can it handle?
Common uses include panic buttons, door alarms, power fail alerts, temperature monitoring, liquid level monitoring, and equipment status alerts.
Is the enclosure suitable for outdoor use?
It is weather resistant when properly installed and sealed, but it is not waterproof or intended for immersion.
Will it work with my existing two-way radio system?
It is designed to work with compatible UHF business-band two-way radios when programmed to the correct frequency and signaling settings.
Why Buy from HiTech Wireless
Knowledgeable support for business radio alerting systems
Help matching the RQT-451 to compatible UHF radios and accessories
Assistance with application planning for doors, alarms, sensors, and call buttons
Trusted source for commercial two-way radio solutions
