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AOR ARD9000 Digital Voice Modem

By the AOR ARD9000MK2 see it HERE!
Hearing is believing!

All over the world, hams have been discovering how much fun it is to work HF without background noise.

AOR set the pace in this breakthrough technology with its ARD9800. Top of the line!

Now, in response to worldwide demand, AOR has developed the ARD9000 which makes digital voice only communications even more affordable.

AOR's digital voice technology delivers audio quality you have to hear to believe. Whether you are working digital voice across state lines or across an ocean, amazing doesn't seem strong enough to describe it.

With an ARD9000, it's easy to convert existing HF analog transceivers to work digital voice with NO transceiver modifications. The ARD9000 automatically detects a digital signal and decodes it, so you also maintain full analog capabilities. Whether a contact comes in as digital or analog, the ARD9000 can handle it.

Discover the fun and excitement working Amateur Radio in digital voice mode 
using the ARD9000 and your EXISTING analogue transceiver on HF!



Yes, the ARD9000 employs an open published digital protocol (Charles Brain G4GUO) per FCC rules.
The transmit bandwidth is within the same spectrum as conventional SSB.

Enjoy digital voice communications while maintaining analogue capabilities
The ARD9000 makes digital voice communications FUN & affordable. Now you can use your existing analogue transceiver to work digital voice on Amateur Radio bands without making any modifications to your transceiver.

No transceiver modifications needed
The ARD9000 uses the same audio frequencies (300 Hz ~ 2500 Hz) as microphone audio to modulate the voice signal. This allows you to use an analogue radio as a digital voice radio.

Works on Single Side Band (SSB) mode
The Automatic frequency clarifier function adjusts frequency drift automatically in the SSB mode. (Approximately up to +/- 125 Hz). Utilizes the OFDM (Multi Carrier Modulation) circuit that is effective against Multi-path or Selective Fading.

Automatic digital receive
Automatic voice signal detector recognizes the received signal as analogue or digital, automatically switching to the appropriate mode.

Built-in high grade Vocoder (AMBE)
Utilizing high-grade digital voice compression delivers quality digital voice communications.

Built-in FEC error correction
A powerful error correction circuit delivers stable and reliable communications.

Small and compact unit. Easy to operate
Simply connect the ARD9000 between the microphone jack and microphone. No complicated modifications necessary. Optional interface cables for most popular transceivers are available or you can build your own connectors.

Wide range of operating voltages
Operates on 10 to 16 V DC from an external power source.

Utilizes a uniquely designed high performance DSP engine.

Uses established G4GUO open protocol
The use of open digital protocol means use of the ARD9000 is permitted on Amateur Radio bands (UK, USA, Japan and most countries are permitted)

Suggested Frequencies!
  • 7.169MHz, 7.170MHz, 7.173MHz, 7.176MHz, 7.290 - 7.299MHz

  • 14.236MHz USB (noisy in UK), try 14.255MHz USB

  • 18.1625 USB

  • 21.370MHz USB

Main Frequency 14.236 USB
(Some Activity Daily 17:00-18:00 UTC)

Main Frequency 7.296 USB
(Westen U.S. Group Activity 23:30 UTC Saturdays & Sundays)

18.1625 USB

21.370 USB

Main Features

  • No transceiver modifications necessary
  • Digital voice communications using existing analog transceivers
  • Amazing Audio Quality
  • Works on Single Side Band (SSB) mode
  • Automatic digital receive
  • Optional interface cables for most popular transceivers
  • Built-in high grade Vocoder (AMBE)
  • Built-in FEC error correction
  • Compact unit. Easy to operate
  • Utilizes a uniquely designed high performance DSP engine
  • Uses the established G4GUO open protocol

Modulation method: OFDM
Band width: 300 Hz - 2500 Hz, 36 carriers
Symbol Rate: 20 mS (50 baud)
Guard interval: 4mS
Tone steps: 62.5 Hz
Modulation method: 36 carriers: DQPSK (3.6K)
AFC: +/- 125 Hz
Error correction: Voice: Golay + Hamming
Header: 1 Sec. 3 tones + BPSK training pattern for synchronization
Digital voice: AMBE coder, decoder
Signal detection: Automatic Digital detect, Automatic switching
between analog mode and digital mode
Power requirements: 10 ~ 16 V DC, Approximately 100 mA Typ(@ 12 V DC)
6 V DC by internal jumper setting
Dimensions (w, h, d): 70 x 33 x 98 (mm)
or 2.8 x 1.3 x 3.9 (inches) (Projections excluded.)
Connectors: Radio: Microphone output (level adjustable)
Speaker input (200 mV ~ 5 V p-p), External Speaker Output
DC Input Connectors
Speaker Microphone (with PTT)
Others: Force Synchronization Switch

Specification & price subject to change without notice due to continuous development of the receiver. E & OE.


Copyright by N4UJW /AOR and/or article author - 2000 - 2007
All Rights Reserved