RM6-A High Data Rate Modem and 2G ALE Controller

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RM6-A High Data Rate Modem and 2G ALE Controller

Used for long distance, point-to-point, and point-to-multipoint data links, the RM6-A for low frequency (LF) and high frequency (HF) radios is a high data rate, standards-based strategic and maritime communications modem.

RM6A HF VHF Modem 2G ALEAs an option, The RM6-A modem can include a 2nd Generation (2G) automatic link establishment (ALE) Controller that is activated by the user with a key selection for LF and HF modem software bundles and offers a compact solution for networking. The 2G ALE function can operate in combination with the RC66 or RC8 5066 Server and IP Controller directly through the remote control port.

Better Connectivity, Security with 2G ALE Networking 

To overcome variable HF propagation conditions, the RM6-A 2G ALE Controller provides better connectivity over a greater number of frequencies and allows linking to other HF stations in a network without operator intervention.

Performing all the basic protocol functions for individual calling, one-to-many calling, sounding and scanning up to 5 channels per second, the 2G ALE Controller provides advanced features with greater reliability than using a single frequency.

The 2G ALE Controller continually scans the pre-selected set of channels, and improves linking quality analysis by continuously listening to sounds and calls from other stations, when not otherwise committed.

MIL-STD-188-141B, App. B Linking protection provides additional security to your HF network.


  • HF Data Modem Waveform Standards:
    • MIL-STD-188-110A/B and App.f
    • MIL-STD-1880141B, App. B
    • STANAG 4539 (QAM), incl. Annex D TDMA
    • 4285 (PSK)
    • 4529 (NB PSK)
    • 4415 (robust)
    • 4481 (shore-to-ship)
  • LF Data Modem Waveform Standards
    • STANAG 5065 (MSK)
  • Configuration and Control Protocols
    • RAP1/RIPC protocol
    • STANAG 5066 (ANNEX E)
  • Waveform Performance
    • Field hardened performance
    • Incl. tests with STANAG 4203 Filter
  • Automatic radio control and channel selection
  • Built-in GPS with time updates
  • Menu-driven configuration and control
  • Individual, Group & Net Calls
  • All, Any, Wildcard Call
  • LQA Sounding & Polling
  • Emergency Operator break-in
  • Automatic Hand-Off to Modem
  • Security Level (AL-1, AL-2)
  • Time Exchange
  • Serial and Ethernet remote control and data input
  • AC and DC power
  • DTE port – EIA 530A Synchronous/Asynchronous

2G ALE Front Panel Configurations and Controls

The RM6-A offers 2G ALE configurations and control via the front panel menu interface.

RM6A Data Modem

2G ALE RM6A Modem

RM6A High Rate Data Modem

The RM6-A will operate with most legacy LF and HF voice radios and control protocols for additional radios can be added as needed.

ALE Waveforms
  • 8-FSK according to MIL-STD-188-141C App A. & FED-STD 1045
  • Doppler lock and track (capture range up to ± 100 Hz, configurable)
  • Adaptive multi-path tracking, Soft Golay decoding
  • Adaptive triple word-phase synchronization, lock and track
  • Linking probability performance 2-3 dB better than MIL-STD-188-141C specification
  • No LP mode degradation
ALE Protocol
  • Calling (IND, GRP, NET, All, Any, Wildcard Call), UUF, AMD, DTM (with or without CRC), (excluding: DBM, AQC-ALE)
  • Calling POLLING, INLINK, RELINK (ALM support commands)
  • Link Quality Analysis (LQA), Scanning (2 or 5 channels per second), Auto Sounding
  • Automatic Hand-Off to Internal Modem (integrated with 3G Traffic Manager)
  • Concurrent operation within 3G Network environment (integrated Session Manager)
Linking Protection
  • According to MIL-STD-188-141C App B. & FED-STD 1049
  • LP key-tables (256) and key select function
  • Automatic key management (Time of day based key selection), LP up to AL-2
  • Can use PPS interface for Time reference. Time Exchange protocol support (AL-1)
  • Key Storage: 2 x 32 LP Keys
  • Key Selection: Manual or Automatic (Daily)
Occupancy Detection
  • MS 110A/B, S4539, S4285, S4415, S4529, S4481, 8-FSK, SSB Voice
Remote Control
  • Configuration Protocol RAP1/RIPC, REMOTE Control Protocol RAP1/RIPC
Radio Control Protocol
  • Integrated with Radio Control Manager (Radio Control Protocol)
  • Integrated with Modem Controller (Radio baseband control, ATU & keyline delay settings, matched volume control etc.)
  • RADIO Control Protocol RAP1/RIPC or Programmable Radio Selection
Configuration For Non-Volatile RAM
  • Network Table: Up to 100 Other IDs, 20 Self IDs
  • LQA Table continuous (compressed) Non-volatile storage. Re-load at start-up. LQA Table pre-load (RAP1/RIPC)
  • 20x 2G ALE Full Network Configuration Presets (MIB in Non-volatile storage)


DTE (Data) Port (DB25F) RS-422 balanced, RS-423, RS-232 unbalanced., MIL-STD-188-114 (interoperable), EIA 530A compliant 
Half & Full Duplex operation, Synchronous, Standard and High-speed Async modes
Remote Control /
GPS Port (DE9M)
Remote Control Pins: RS-485 Multi-drop, RS-422 balanced or RS-232
Protocol: Control Protocol (RAP1 + RIPC, ASCII S5066 Annex E)
External GPS Control Pins: RS-232 (nominally input)
Data Rate: 300 to 19200 bps, 1/2 stop bits, 7/8 bit data. PPS line: RS 232/422 (NMEA) or TTL
Ethernet CTRL Port (RJ45) Remote Control: 10/100 Base T (IEEE 802.3U compatible), embedded TCP/IP Stack
Protocol: Control Protocol (RAP1 + RIPC)
Ethernet Data Port (RJ45) IP Packet Data: 10/100 Base T (IEEE 802.3U compatible), embedded TCP/IP Stack
Protocol: Raw IP packet data, requires 3G ALE.
Local Control Local control via 32x202 pixel graphical LCD display and 16-key keypad. 3 bi-colour LED indicators
Alphanumeric and digit keypad for fast data entry, 4-way navigation button

Radio Control
& Audio Ports

Radio Control Pins (2 channels): RS-232, up to 115200 bps, 1/2 stop bits, 7/8 bit data
Supports for various radio control protocols are built-in.
Input Audio (2 channels): 600 Ohm balanced, –20 to +10 dBm without adjustment
Output Audio (2 channels): Balanced, –40 to +10 dBm adjustable into 600 ohm load
Keyline: Non-polarized contact closure (<45 V, 200 mA).
PTT Sense Input: Pull to ground to indicate external PTT.
Aux Audio Pins: Connection of microphone for ALE voice calling
Input Audio: 600 ohm balanced, –20 to +10 dBm without adjustment or MIC input (selectable)
Output Audio: Balanced, –40 to +10 dBm adjustable into 600 ohm load
Power Supply Variant 1, AC Supply: 90-264 VAC, 40–440 Hz, 2A; 100-370 VDC
Variant 2, AC + DC: 90-264 VAC, 40–440 Hz, 2A; 100-370 VDC & 6–36 VDC MIL-STD 1275B protection

RM6A HF Modem - ALE