721S Fixed Site VHF-UHF Radio Transceiver

Here’s a flexible solution for stand-alone receivers, transmitters or transceivers – the 721S high-power AM/FM VHF-UHF radio transceiver. The 721S gives you reliable, long-range communications that you can optimize for highly congested operational conditions. An optional full-color display and software-definable touchscreen on the removable RCU-710 radio controller unit offer you an intuitive 721S VHF-UHF receiver-transmitter user interface for radio control and status, along with voice audio and keying connections.

In addition, the 721S radio sets are fully configurable to satisfy your most demanding VHF and UHF line-of-sight needs as well as supporting multiple voice and data operating modes. The 721S can be customized to provide AM and FM frequency coverage in any specific band up to a full 30-512 MHz. Plus, you’ll get the benefits of superior interoperability via the system’s Ethernet-based command and control system, and industry standard severe cosite operation.



GS Customer Support
Phone 1: 800-321-2223 (U.S. only)
Phone 2: +1 319-295-5100

Features & Benefits

  • Configurable 30 to 512-MHz frequency range provides VHF and UHF scanned 121.5 or 243.0 MHz GUARD channels as applicable
  • Offers standard radios with VHF, UHF, V/UHF and 30-512 MHz extended frequency coverage
  • Fixed frequency or frequency hopping
  • Customizable performance and pricing options
  • AM, FM, wideband data/voice
  • Optional RCU-710 Control Unit: installed in the radio front panel or remotely connected via IEEE-compliant 10/100 Ethernet link
  • A single RCU can manage multiple RTs for monitor and control VoIP, voice audio and transmitter PTT keying
  • Clarity noise reduction algorithms increase talk power, link margin and range by 2X (reference Clarity™ video)
  • Voice over Internet Protocol (VoIP) for standard digital audio interfacing and remote connections
  • Networked remote controllers and radios allow flexible control options and the decentralized system architecture typically precludes the need for expensive voice switching systems and VoIP gateways
  • Software Defined Radio (SDR) implementation and Digital Signal Processors (DSPs) allow simplified customization and future upgrades
  • Includes Ethernet or optional RS-422 remote control interfaces for radio control and monitor with a dedicated remote controller unit or standard PC
  • 70 MHz IF interface for external appliques/modems
  • Provides high power 100W RF transmitter with selectable RF output power turndown
  • Built-In-Test capability in both receiver-transmitter and radio controller unit provides fault detection and isolation
  • Same mount and cabling as legacy GRC-211/171 radios
  • 970 User programmable mode and frequency presets
  • Built-in loudspeaker, handset, headset and microphone interfaces
  • AC or DC input power with auto-switchover
  • External tracking filter options tailor performance to operate efficiently in the most severe cosite environment



Operating Frequency: 30.000 – 511.975 MHz (available)

Channel Spacing and Modulation Modes: 25 kHz (AM DSB, FM); 12.5 kHz (AM DSB, FM); 8.33 kHz (AM DSB in VHF ATC band)

Receiver Sensitivity: -103 dBm, AM voice; -108 dBm, FM Voice; -97 dBm, AM or FM WB (Note: 7db typical improvement with Clarity™ enabled)

Stability: 1.0 PPM (0.1 PPM available)

Transmit Power: 100 W FM; 30 W AM @ 90% mod; Adjustable power output in 1 dB steps

Transmit Duty Cycle: Continuous duty under all conditions; Full power at VSWR <2:1;RF level ALC NMT +/- ldb variation under normal operating conditions; up to 6 dB power reduction VSWR >2:1

RT: Standard 19” wide rack mounted; 7” (4 RU) high

RT Control: Removable front panel radio controller unit, external RCU or remote networked PC

Built-In-Test: Continuous fault detection (C-BIT); User initiated fault Isolation (I-BIT)

Audio: NB voice and WB data; Balanced 600 Ohm; -10 to +10 dBm output level; Adjustable in approx. 1 dB steps; Tape/external speaker output

Reliability: >50,000 hours MTBF ground benign

Maintainability: NMT 15 minutes MTTR


Power Input:

90 to 250 V ac, 48-62 Hz, 1 Phase; or 24 to 30 V dc


Temperature: -30°C to +55°C operating; -40°C to +85°C storage

Humidity: 5% to 95% non-condensing

Cooling: Internal forced air

Typical System

Main Components

Please contact Rockwell Collins for additional information on this product.

Related Documents

General Information

Modernized, high-frequency communications brochure


A complete range of technical information is available to support your operation and maintenance needs. The technical publications index allows you to identify the most current version of a publication, service bulletin or related document by part number, equipment type, system and similar functions. To search the index, use the global search box in the upper right corner of the page. If necessary, click the Pubs and Training tab to see results from the technical publications index.

You can also continue to use our legacy index.

Authorized users of the technical publications index can also view all of their pubs on our dashboard. Just log in, then move your mouse over the My Account menu button and choose Dashboard.


Our instructional design specialists and staff of experienced instructors develop and support solutions to meet your operator and maintenance training requirements. We offer a host of solutions to maximize your investment. On-site and customized training are available.

Contact a representative.

Our Learning Management System allows you to review course schedules for Instructor Led Training (ILT) and computer based training (CBT) offerings. Register as a student and enroll or take courses online. A username and password is required.

Services & Support

Field Support Services

We provide a dedicated team of trained field service engineers ready to be dispatched at the point of need. Whether it's training, testing or on-site consultations, we have field service engineers ready to respond to your support requirements.

Contact a representative

Tailored Services

Our facilities and capabilities allow us to offer a variety of support solutions from time and material repairs to fully integrated performance based logistics via both Contractor Logistics Support (CLS) and Public Private Partnerships (PPP). The end result is increased operational readiness for the warfighter.

Our Performance Based Logistics (PBL) delivers the best combination of commercial best practices with proven logistics expertise to support challenging and ever-changing military operational requirements. PBL solutions ensure guaranteed performance for the warfighter and predictable maintenance costs.

Contact a representative

Maintenance & Repair

We actively seek to collaborate with industry and the government to implement total lifecycle support solutions within maintenance depots. By working together, efficiencies are gained that increase operational readiness, reduce total ownership costs, and reduce obsolescence exposure for the supported weapon systems. Contact a representative

Maintenance and repair are vital to support the life of your products and superior support is what we do best. Our global repair facilities provide maintenance on your equipment both in and out of warranty.  Our Equipment Repair Directory allows you to enter your part number to find locations where it can be serviced.

Spares & Parts

Our world-wide Rental/Exchange Service is ready to provide for your operational needs—24 hours a day, 7 days a week. We offer an extensive asset inventory and support system to deploy parts where and when you need them.

Phone: 1-800-713-7693 (within the U.S. only) or 1-319-295-4361
Fax: 1-319-295-6646
Email: rentalexchange@rockwellcollins.com

View our Rental and Exchange Catalog. Registration is required. 

Related news