• Frequency: 2.0 to 29.9999MHz
• Modes: USB, LSB, ISB, AM/AME, CW
• Modulation
  • Analog: Voice, Data, Link 11/TADIL-A, HF-Messenger (e-mail)
  • Serial Data: RS-232 Sync and Async
• Maximizes transmit ERP: Couplers designed for maximum power transfer ratio
  • Probe/Wire Antenna installations: 400 PEP and/or Average all modulations
  • Shunt Coupler installations 400 PEP/200W Average all modulations
  • Design for Link 11/TADIL-A: MIL-STD-188-203-1A/STANAG 5511
• Enhanced Communications
  • Enhances voice link reliability up to 5dB
  • Enhances Link 11/TADIL-A link connectivity and reliability
  • Enhanced secure voice, serial encrypted KY-100
• Enhanced SIMOP
  • HF-to-HF Bandpass Filtering
  • HF-to-V/UHF LP Filtering
• Embedded Modems
  • Automatic Link Establishment: MIL-STD-188-141B, Appendix A & B (LP-0/1/2)
  • Multi-mode: MIL-STD-188-110B
    • Para 5.1.1 Narrow-shift FSK
    • Para 5.1.2 Wide-shift FSK
    • Para 5.3 Serial (Single Tone) Mode
    • Para 5.3.1.3A STANAG 4285
    • Appendix C Data Rates > 2400 bps Compatible
    • Appendix F Multiple Channels
  • SELCAL: ARINC 714-6 Decoder
• HFDL: ARINC 635/753
  • Add-on CP-2024C/ARC-190(V) HFDL Processor
• P³I (Pre-planned Product Improvement) "Growth"
  • MIL-STD-188-148A
  • STANAG 4415
  • STANAG 4529
  • STANAG 4538
• DSP based Receiver-Exciter, programmable for new communication technologies.
• Flexible Installation design
  • Firmware programmable: I/O adapts to existing installation or specified interface Audio and discrete interfaces
    • Six Transmit Inputs, Five Receive Outputs
    • Multiple discrete Inputs/Outputs
  • Form (near form)-Fit-Function replacement, emulates existing installations
• Customer Acceptance:
  
  

  USAF RC-135V/W	USAF E-3B/C AWACS	UK RAF E-3D AWACS
  USAF VC-25A AF-1	USAF C-32A SAM	ABL USAF YAL-1A
  Canada CP-140 Aurora	Chilean P-3A Orion	Boeing WDMC
  NATO E-3A GTS	Norwegian ULA Sub	USN P-8A MMA
  USN P-3C Orion, AIP/BMUP/CIP	USN EP-3E	Singapore E-2C Hawkeye

The HF-121C high performance radio system is designed for HF applications requiring voice and data operations at 400W transmit power. Compliant with the airborne requirements of MIL-STD-188-203-IA/STANAG 5511 for Link 11/TADIL A, this 400 Watt PEP/Average power radio provides maximum performance for airborne applications.

The HF-121C has been optimized for tactical digital data communications and simultaneous operation (SIMOP) of multiple radio sets with minimum frequency and antenna separation. Embedded Automatic Link Establishment (ALE), Multimode Modem, and ARINC 714-6 SELCAL decoder capabilities are also available.

The basic radio set is partitioned into a receiver-exciter with integral pre/post-selector on a mounting tray or common mounting tray, and a power amplifier-power supply on a mounting tray or common mounting tray. The receiver-exciter can be used independently of the power amplifier. A serial manual control 913Z-5, computer based serial control via RS-232, and/or MIL-STD-1553B is available. Priority enable lines determine active control interface with 1553 bus requests for status provided when 1553 is not selected as active control.

The HF-121( ) family of radios has been installed in commercial and military aircraft in the United States and in foreign countries. It has been selected as the standard HF radio by many aircraft manufacturers. Earlier versions of the HF-121/121A/121B product line have received military nomenclature designation of AN/ARC-153, AN/ARC-157, AN/ARC-191(V), AN/ARC-207(V), AN/URC-91, and AN/URC-97(V) by the United States and AN/ARC-512 for other nations. Current versions of the HF-121BD/C product line have received military nomenclature designation of AN/ARC-243(V) by the United States Navy, AN/ARC-230 by the United States Air Force (specific to the USAF E-3B/C platform), and AN/ARC-2201(V) and AN/ARC-512A(V) for other nations.

The transmitter is capable of continuous transmission in all modes at ambient temperatures up to +55° C at sea level. Modes such as SSB voice which yield high peak to average power ratios (8 dB or greater) will show no degradation in power output up to +55° C and 50,000 feet. Short periods (1/2 hr) of operation up to +71° C are permitted in all modes. A combination of mounting trays are available which require external cooling air or contain integral blowers. A full line of Wire, Probe, and Shunt Couplers are available from the AN/ARC-190(V) product line.

For combinations of duty cycle, peak-to-average power ratios, altitude, and temperatures that exceed the thermal capability of the transmitter, the power output will be gracefully reduced to a power level at which it can safely operate without equipment damage.

The basic receiver-exciter provides a software (software developed at OEM) configurable I/Os which allow the system application to emulate a prior installation for ease of retrofit without the need of large and/or expensive adapters. Configurations have been developed for; P-3A AN/ARC-94 "618T" replacement, CP-140 AN/ARC-512 replacement, VC-25A AN/ARC-207(V)3 replacement, E-3( ) AN/ARC-165 replacement, E-2C AN/ARC-157 replacement, P-3C AN/ARC-161 replacement, and E-767 AN/ARC-207(V)9 replacement all without the need for expensive aircraft re-cabling and/or adapter units. Configurations for new installations have been developed for RC-135V/W, YAL-1A ABL, C-32A, and P-8A MMA.

To achieve optimum receiver performance in a collocated situation, the level of interfering signals must be reduced to an acceptable level relative to the desired signal strength.

The embedded preselector will improve performance in the areas of out-of-band intermodulation distortion, cross-modulation, image rejection, IF rejection, reciprocal mixing, and high voltage protection.

When used in the transmit path, the bandpass filter is useful in reducing the levels of the out-of-passband broadband noise, spurious outputs, and harmonics that are generated in the receiver/exciter-modem.

The HF-121C Radio Set has been optimized to provide compliance with the signal characteristics of Link 11/TADIL-A as defined in MIL-STD-188-203-IA/STANAG 5511, Interoperability and Performance Standards for Tactical Digital Information Link. Power is maximized per requirements at 400W peak with the peak to average modulation of NLT 8.5dB maintained. The average power control between the 2-Tone and 16-Tone portion of the transmission is maintained at ~2dB per requirements.

Physical Characteristics of Typical HF-121C Equipment and associated Couplers:

• HF-121C Transceiver (549E-1)
  • AC power (three phase), 400 Hz, 115 VAC (L-N)/208 VAC (L-L), Category "B"
    • Transmit: 2100 VA Maximum, > 0.90 power factor, leading
    • Receive: 800 VA Maximum, > 0.50 power factor, lagging
  • DC power +28 Vdc, Category "B": 0.10 A maximum "On/Off Control":
• HF-121C Transceiver (671Z-5)
  • None: Supplied by 549E-1
• Control (913Z-5)
  • DC power +28 Vdc, Category "B": 0.70 A maximum
  • Edge Lighting:
    • 28V, 1.0 A Maximum / 0.5 A Nominal
    • 5V, 6.0A Maximum / 3.0A Nominal
• 490A-1/2 Couplers
  • AC power (single phase), 400 Hz, 115 VAC (L-N), Category "B":
    • Transmit : 100 VA Maximum, >0.80 power factor
    • Receive: 75 VA Maximum, >0.50 power factor
• 490S-4B/C Couplers
  • None: Supplied by 549E-1

Phone: 800-321-2223 or (319) 295-5100
Fax: (319) 295-4777
Email: <response@rockwellcollins.com>
Website: http://www.rockwellcollins.com/gs