RT90 Full-Power DMR Dual Band Mobile HAM Radio with Built-in GPS – In-Depth Review
The RT90 Full-Power DMR Dual Band Mobile HAM Radio is a solid performer in the realm of digital amateur radio, offering a combination of high power output, dual-band versatility, and integrated GPS functionality. Designed for mobile installations, this radio aims to cater to amateur operators seeking both analog and digital communication capabilities in one robust package. In this review, we’ll explore the radio’s key features, performance, usability, and build quality to help you decide if it's the right fit for your setup.
Design and Build Quality
The RT90 has a rugged and utilitarian design, typical of most mobile HAM radios. Its housing is made of durable metal, designed to withstand the heat and vibration common in vehicle installations. The front panel is dominated by a bright color display and a functional keypad, providing direct access to channels, settings, and navigation. The buttons are tactile and well-labeled, making it easy to operate even in low-light conditions or while driving.
Heat dissipation is handled by a sizable heatsink and an internal fan, which does a good job keeping the radio cool during prolonged transmission. Mounting brackets and hardware are included, and installation into a vehicle dash or radio rack is straightforward thanks to its standard dimensions and power connections.
Power Output and Frequency Coverage
One of the standout features of the RT90 is its full-power transmission capability. It offers up to 45 watts on UHF and 50 watts on VHF, making it suitable for long-range communications. Whether operating in urban environments where signal penetration is critical or in rural areas where distance matters, the RT90 performs reliably.
Frequency coverage includes both the VHF (136–174 MHz) and UHF (400–480 MHz) bands, allowing access to a wide array of repeaters and simplex channels. This dual-band functionality is essential for operators who need flexibility in their communications setup.
Digital Mobile Radio (DMR) Capabilities
The RT90 supports Tier I and Tier II DMR protocols, which means it can communicate over both direct and repeater-based digital networks. It features dual time slot operation on DMR repeaters, allowing two simultaneous conversations on a single frequency. This is ideal for busy channels or group networks where efficiency and clarity are important.
Audio quality on DMR is excellent. Digital transmissions come through with little to no background noise, and the voice reproduction is crisp and clear. The radio also supports a range of DMR features including private calls, group calls, and text messaging.
For those who still use analog FM modes, the RT90 also supports conventional analog operation. This makes it easy to switch between legacy systems and modern digital networks.
Built-in GPS Functionality
Another major highlight of the RT90 is its built-in GPS receiver. This enables location-based features, such as APRS (Automatic Packet Reporting System) and GPS data transmission over DMR. For emergency communications, mobile tracking, or public service events, the GPS function adds significant value.
Location data can be transmitted over DMR networks if supported by the system, and it can also be displayed on-screen for local navigation or tracking. The GPS locks quickly and maintains a steady fix, even under challenging conditions like dense tree cover or urban canyons.
Programming and Software
Programming the RT90 can be done via computer using the included software and cable. The software interface is utilitarian but comprehensive, giving access to channel settings, contact lists, talk groups, zones, and more. For DMR users, building a proper codeplug (the configuration file) is essential, and the RT90 software allows for fine-grained control.
While the learning curve for DMR programming can be steep for beginners, experienced users will appreciate the level of customization available. Firmware updates are also supported, adding longevity to the device as features and compatibility improve over time.
User Interface and Display
The display on the RT90 is clear and colorful, with adjustable brightness for different lighting conditions. It provides vital information at a glance, including frequency, mode, power level, signal strength, and GPS status. The user interface is menu-driven and navigable via the front panel keypad and function buttons.
The microphone is ergonomic and includes a full DTMF keypad, making it useful for both voice operations and control commands. Audio from the internal speaker is strong and clear, but there's also an external speaker jack for louder environments.
Performance and Reliability
In day-to-day use, the RT90 delivers dependable performance. Transmissions are strong and consistent, with good modulation and clear reception. Dual band standby allows monitoring of two channels or frequencies simultaneously, which is great for multitasking or monitoring both digital and analog traffic.
The cooling system works efficiently, and the radio maintains stability even during long transmission sessions. Its build quality ensures it can handle the rigors of both mobile and base station setups.
Final Thoughts
The RT90 Full-Power DMR Dual Band Mobile HAM Radio with built-in GPS offers an impressive range of features for its price point. Its high power output, DMR capabilities, dual-band operation, and integrated GPS make it a versatile choice for serious amateur radio operators. Whether you're involved in public service events, emergency communications, or everyday HAM activities, this radio provides the tools needed to communicate effectively and reliably.
While beginners may face a learning curve with DMR and programming, the overall user experience is rewarding for those willing to invest the time. The RT90 is a strong contender in the mobile HAM radio market and is well-suited for operators who need a durable, feature-rich, and high-performing transceiver for their vehicle or base station.