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Chapter 1 - Introduction
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CHAPTER 1
INTRODUCTION
The KAM is a high performance terminal unit providing Morse (CW), RTTY, ASCII, AMTOR and
Packet communications on the High Frequency (HF) bands. It will also provide Packet operation on
VHF/UHF bands. Each of these capabilities is is amplified in the following paragraphs.
Microprocessor control means the KAM has optimal filter settings for each mode, shift and data
rate selected. KAM has the added features of multiple RTTY shifts and limiter/limiterless operation.
Every computer you use with the KAM will have to have a simple terminal program to interface
with the KAM. You can have enhanced operation, such as file transfers, with a sophisticated mo-
dem program.
Hardware Description
KAM incorporates and integrates both HF and VHF capabilities in a single unit. There are two
radio ports, one for HF and one for VHF. The VHF port operates Packet only, while the HF port pro-
vides All-Mode digital facilities. When operating Packet you designate which port is to send data by
use of the corresponding
STReamswitch
character. It is therefore possible to be connected to and
conversing with stations on both HF and VHF at the same time.
There are two separate modems in the unit. The VHF modem which addresses the VHF port
operates at 1200 Baud. The HF modem which addresses the HF port operates at up to 300 Baud.
Both modems are optimized for their intended use.
Morse Mode: Transmit and receive operations at speeds ranging from 5 to 99 words per
minute. A separate CW filter is provided which can be controlled with software commands from the
computer keyboard. This filter's center frequency is nominally set at 750 Hertz. However, the cen-
ter frequency can be varied to suit your transceiver's requirements. The bandwidth of the CW filter
is normally set at 200 Hertz and may be set to any bandwidth between 50 and 1000 Hertz. Refer
the
CWTone
and
CWBand
commands in the command section of this manual.
Baudot RTTY Mode: Baudot code from 45 to 300 Baud may be sent and received. Note that the
RTTY speeds are referred to in Baud rather than words per minute. The unit's default rate is 45
Baud which equates to 60 words per minute. Other commonly use standard RTTY speeds are 67,
75, 100 and 132 word per minute. These rates equate to 50, 66, 75 and 100 Baud respectively.
With the KAM you can set any Baud rate up to and including 300 Baud, in one Baud increments,
with software commands from the computer keyboard. Any commonly accepted RTTY shift may be
established by software command. These are 170, 425 and 850 Hertz shift. In addition, you can
establish any other intermediate shift you may wish to use. Refer to the
MARk
,
SPace
and
SHift
commands in the command section of this manual.
AMTOR Modes: ARQ, FEC and Selective FEC transmit and receive operations are available. In
addition, an AMTOR ARQ listen mode is selectable for monitoring other stations ARQ links.
HF Packet Mode: This unit incorporates the necessary circuits and firmware to provide Packet
operation on the High Frequency bands. When Packet operation is selected, a tone pair of
1600/1800 Hertz and an output Baud rate of 300 is established. You may designate other tone
pairs if you prefer, however, you should remember to generally maintain a 200 Hertz shift. Other
shifts can be established, but doing so could make a difficult for other packet stations to copy your
signals unless they are also using the same shift.
VHF Packet Mode: Packet operation is available using standard Bell 202 tones of 1200/2200
Hertz only at 1200 Baud.