CQ-Calling All Hams!
Ham Radio News!
Ham Radio Videos!
HF & Shortwave
RFI Tips and
Support The Site
Vhf and Up
The AOR ARD9800 SSB DIGITAL
DIGITAL SSB WITH ANY HF
AOR ARD9800 could be the biggest revolution in HF radio since SSB
The ARD9800 is a modem unit that connects to
the mic input of any transceiver. The user simply wires a connector
for his particular transceiver, connects the speaker output of his
transceiver to the modem and then connects the modem to a 12 VDC
Reviewed 4.5 out of 5 on eham.net Sept 2006
Come back here when done
NORMAL ANALOG OPERATION OF THE TRANSCEIVER
Digital voice HF is possible by selecting
the Digital Mode
Incoming digital voice signals are
automatically decoded, no selection necessary.
NO MODS TO THE TRANSCEIVER ARE
1. The ARD9800 provides NEAR
FM QUALITY audio using SSB.
2. The digital signals may require
LESS SIGNAL than analog throughput making operations possible under
adverse band conditions.
HOW DOES IT WORK?
this is a greatly simplified explanation: the ARD9800 digitizes the
signal and divides into 36 PSK sub-signals in the bandwidth occupied
by a normal voice audio signal.
IS IT LEGAL?
uses an open published digital protocol (G4GUO) per FCC rules. In
the USA, you may identify in digital or analog
DOES IT WORK IN
Yes! The ARD9800 can be used in AM or FM modes,
however, FM mobile operation could be prone to "picket fencing"
which could result in the loss of data.
IS THERE A MARKET FOR
The ARD9800 was demonstrated for audiences at Dayton and
HAMS LOVED IT! The most asked question was,
"When is it available?"
WHAT ELSE DOES IT DO?
optional memory board, images can be easily transferred, similar to
SSTV but we believe the ARD9800 sends a higher quality image. You
can also send file transfers.
Owner can use ARD9800 mic, or a mic
of their choice (wired for ARD9800 input).
WHAT MUST I DO TO
GET ON THE AIR WITH THE ARD9800?
The ARD9800 package includes,
modem, mic, cables and manual.
1. You must build (or buy) a
cable that interfaces from the rear panel of the ARD9800 to the mic
input of your transceiver, similar to a packet radio connection
between a TNC (modem) and your radio. Then simply connect the mic
input cable, the "speaker out" from your transceiver to the "audio
in" on the ARD9800 and connect the power cable to the
2. It is suggested that you power the ARD9800 from a
well regulated DC power supply. The use of "wall cube" and some
"switching" power supplies is not recommended.
3. Be sure
your mic and audio output settings are OK.
4. Make a test
transmission in the analog mode prior to operating in digital
ARE THERE OPERATING SUGGESTIONS?
1. Try to
coordinate your frequencies as closely as possible.
7.169MHz, 7.170MHz, 7.173MHz,
7.176MHz, 7.290 - 7.299MHz
14.236MHz USB (noisy in UK), try
Main Frequency 14.236
Activity Daily 17:00-18:00 UTC)
Main Frequency 7.296 USB
(Westen U.S. Group Activity 23:30 UTC
Saturdays & Sundays)
There is some
small margin for error, but best results are obtained when both
transceivers are exactly on the same frequency.
sure your audio filters are about 3KHz or wider.
"overdrive" your ARD9800 with too much audio from your
4. Don't transmit using "compression" (also known as
a speech processor).
5. Be sure your ALC is within its specified
operating region. If in doubt, lower audio output seems to work
better than a higher setting.
6. Be mindful of your bandwidth
when selecting a frequency on which to transmit. Be sure you will
not interfere with operators on adjacent frequencies.
ABOUT DUTY CYCLE?
Your duty cycle will be more intense. This is
important to users of amplifiers. Because the digital signal makes
full use of the SSB audio bandwidth, you should consider that you
will be transmitting at the maximum power output you have selected.
At maximum power settings, this will likely result in your
transmitter consuming more power and generating more heat. If you
transmit images or large data files, your "key down" time could be
three minutes or
300 Hz - 2500 Hz, 36
20 mS (50 baud)
36 carriers: DQPSK
+/- 125 Hz
Voice: Golay + Hamming
Covolution + Reed-Solomon
1 Sec. 3 tones + BPSK training pattern for
Automatic Digital detect, Automatic
between analog mode and digital
AOR original adaptive
10 ~ 16 V DC, Approximately 200 mA Typ(@ 12
6 V DC by internal jumper setting
RS-232C, 9600 bps,
Dimensions (w, h, d):
100 x 32 x 158 (mm)
or 3.94 x 1.26 x 6.14
(inches) (Projections excluded.)
Radio: Microphone output (level
Speaker input (500 mV ~ 5 V p-p), PTT (Push To
Video IN/OUT: NTSC 1 V p-p (75
Microphone input, Speaker output, PTT
Signal Encryption for commercial
(where permitted; special commercial version
Analog/Digital mode selector
|Specification & price subject to change
without notice due to continuous development of the receiver. E
Where can I get it?
Get it from ScannerMaster at a great
Scan Police, Fire,
Rescue, Ham Radio, Aircraft, Ships, and much