Hal Communications Fax-4100 Over Radio System Manual

							Sending FAXover radio made easy!
1. Lay your page(s) on the F AX machine.
2. Enter ID of distant station and “#” key .
3. Push “start” on F AX machine.
Radio equipment is  transparent to the user . The oper-
ator need not know an HF radio system is being used! The  HAL FAX-4100 accepts your “call”, decodes
the dialed station number , passes this number to the
DSP4100/2K, and receives and stores the F AX data
in its on-board memory . The FAX-4100 then
instructs the DSP4100/2K to “link” with the distantstation. Once the link is established the distant F AX
machine is polled to be sure it is available to acceptan incoming F AX. If the distant F AX machine is
available, the data is sent by the DSP4100/2K and isstored in the distant F AX-4100’s on-board memory .
After it is determined that the F AX is complete a
delivery conformation is returned to originating sta -
tion, the “link” is disconnected, and the deliveryconfirmation is printed. A page of business correspondence can be sent in 2 to 10 minutes, depending upon ionosphere condi -
tions and density of the page to be transmitted. Bestof all, the F AX operator need not know nor care that
an HF radio system is part of the F AX link. It all
works - just like a standard F AX telephone transmis-
sion!  Put the radio stuf f in a closet - and don’t worry
about it!  The F AX-4100 directly interfaces to any standard
“Group-III” (G3) telephone F AX machine. We 
provide ring signal, of f-hook loop current, dial tone, and DTMF tone decoding. At the start of each F
AX
connection, the F AX-4100’s internal F AX modem
negotiates data rate and other communications parameters with your F AX machine. On the radio
modem side, the F AX-4100 includes the normal link
and control commands used by the HAL DSP-4100/2K modem.
Send F AX images without phone lines or satellite communications! The HAL Communications F AX-OVER-
RADIO product line integrates a standard facsimile (F AX) machine into your high frequency radio system.
The FAX-4100 connects between your F AX machine and our DSP-4100/2K radio data modem. The only con -
nection required to the F AX machine is the standard “RJ-1 1” phone connection.  Installation is very simple!
FAX-4100
HF FAX Over Radio System
Basic F AX-OVER-RADIO System   
						

							SYSTEM COMPONENTS: The HAL FAX-OVER-RADIO System is simple
and makes maximum use of your  G3 F AX machine
and SSB HF station. Add the DSP-4100 and F AX-
4100 and you’re on-the-air with F AX. 
V irtually all modern SSB HF transceivers may be
used for F AX. The 500 to 2500 Hz spectra of
CLOVER-2000 is directly compatible with SSB radio passbands. Special bandwidth filters or superphase-linear filters are  notrequired. The  +
50 Hz fre-
quency tolerance is compatible with virtually all modern synthesized SSB equipment. Standard 100W att transmitters and simple antennas (1/2 wave
dipoles or 1/4 wave verticals) are all that is neededfor most F AX-OVER-RADIO links.  
Note that all HAL units operate from “nominal”12VDC (10 to 18 VDC, in fact). The HAL F AX-
OVER-RADIO system is a very good choice foreither fixed or portable/field installations. COMPUTERS & OTHER EXP
ANSION:
The basic F AX-OVER-RADIO system does not
r equir ea computer at either end. All control func -
tions and data communications are handled withinthe HAL F AX-4100 and DSP-4100/2K. This makes
for a very low-cost and simple system for remoteareas where a computer is not required nor desired.  However , a computer can easily be added to the
communications link. This allows use of CLOVER- 2000 for all forms of data. If you wish to design cus -
tom software, the computer may also be used for fur -
ther data compression, communicationwith the radiocontrol port, or other control functions. The DSP-4100/2K includes a second serial I/O port whichmay be used to connect to the control port of the HFradio, eliminating the need for a second serial portfrom the computer - a serious problem for lap-topPC’ s. Standard phone line and data circuit connec -
tors are used to keep installation simple.
F AX-4100:
ConnectionForm
Loop
Ring Output DTMF
Dial T one
F AX
F AX Data Storage
MODEM Por t:
Connection Format
Data Rate
Protocol
Flow Control
PC Por t:
Connection Format
Data Rate
Power: Mechanical:
2 wire, RJ-1 1
Isolated & balanced 24 VDC, 20 ma of f-hook
100v p-p, 20 Hz16 tones, TX & RX400 HzGroup III (T .30)
1 Meg std; 4 Meg optional RS-232, DE9P Serial, asynchronous, 8 bits9,600 - 57,600 bps T o match DSP-4100
Hardware (CTS/R TS)
RS232; DE9SSerial, asynchronous 9,600 - 57,600 bps  10 to 18 VDC5.75 x 9.6 x 1.7” 2.75 lbs
F AX-4100 Interface:
Connects between a standard G3 Facsimile (F AX)
machine and the HAL DSP-4100/2K modem. It includes simulation of all phone line signals required for properoperation of the F AX machine. In transmit mode, the
F AX-4100 intercepts DTMF number from the F AX dial
pad, initiates the ARQ link via DSP-4100/2K, handshakesand stores data from the F AX machine, passes data to
DSP-4100/2K, ends the radio link, and disconnects theF AX machine when the F AX has been delivered. In
receive mode, the F AX-4100 accepts the call from a DSP-
4100/2K and radio link, rings the F AX machine, senses
of f-hook, handshakes with the machine, and passes data
from the DSP-4100 to the F AX machine.
DSP-4100/2K:Digital Signal Processor (DSP) modem for use with highfrequency (HF) radio equipment. The CLOVER-2000waveform and protocol is used for data communicationsbetween two locations. The modem interfaces between aSSB HF transceiver and the F AX-4100 FAX-OVER-
RADIO interface.  CLOVER-2000: V oice bandwidth digital communications waveform and
protocol for use with HF SSB equipment. CLOVER-2000uses an Auto-adaptive ARQ mode that continuously cor -
rects for measured changes in the ionosphere-conductedradio signal. The transmit modulation is dynamicallyadjusted to maximze error-corrected data throughput from200 to 2000 bits/sec. F AX data can be sent at the rate of 1
page in 2 to 10 minutes, depending upon the page densityand the ionosphere conditions.
Specifications
HAL COMMUNICA TIONS CORP.
1201 W . Kenyon Road, P .O. Box 365
Urbana, Illinois 61801-0365 Phone: (217) 367-7373 F AX (217) 367-1701
www .halcomm.com