Am Transmission; Digital Operation; Rtty (Frequency Shift Keying) - Kenwood TS-870S Instruction Manual

6 COMMUNICATING

AM TRANSMISSION

Each mode used on the HF Amateur bands has its own
advantages. Although long distance DX contacts may
be less common while using AM, the superior audio
quality characteristic of AM operation is one reason why
some prefer this mode.
When looking for others using AM, check the following
frequencies first:
• 3885, 7290, 14286, 21390, and 29000~29200 kHz
Refer, if necessary, to "OPERATING BASICS"
beginning on page 19 for complete receiving details for
any mode.
1 Select the operating frequency.
2 Press [FM/AM] to select AM mode.
AGC AUTO
3 Select the ALC meter function by pressing [METER].
4 Press and hold down the Microphone [PTT] switch,
or press [SEND].
• The "ON AIR" indicator lights.
• Refer to "VOX" {page 45} for information on
automatic TX/RX switching.
5 Without speaking, adjust the CAR control so that the
ALC meter just begins to indicate.
6 Speak into the microphone and adjust the MIC gain
control so that only a few segments on the ALC
meter light.
• Speak in a normal tone and level of voice.
Speaking too close to the microphone, or too
loudly, may increase distortion and reduce
intelligibility.
7 If you want to use speech processing, press [PROC]
to switch on the Speech Processor and adjust as
described on page 46.
8 Release the Microphone [PTT] switch, or press
[SEND] again, to return to the receive mode.
• The "ON AIR" indicator goes out.
This completes the "AM TRANSMISSION" section.
Refer to "OPERATING AIDS" beginning on page 44 for
information about additional useful functions for
operating.
40
AM

DIGITAL OPERATION

Since Multimode Communications Processors (MCP)
have become popular, many Amateurs enjoy operating
using a number of digital modes. The power and variety
of Amateur radio increased greatly with the
development of MCP that can use your TS-870S
transceiver as the communications link.
For example, it's possible to take advantage of the
camaraderie found on RTTY, then move to Packet to
access an RBBS (Radio Bulletin Board System) to
download a recent shareware program you've heard
about, and then move again to AMTOR or PacTOR to
deposit mail in a regional mailbox for forwarding. After
that, you may switch to G-TOR
lightning fast file transfer with a friend.
Consult ACCESSORY CONNECTIONS {pages 5~7}
before proceeding if you need installation information. It
is assumed here that you have all hardware, and
software if necessary, already correctly installed.

RTTY (FREQUENCY SHIFT KEYING)

Important Menu items to be aware of before beginning
to operate RTTY include the following:
• Menu No. 62 (FSK.SHFT): Selects 170, 200, 425,
or 850 Hz shift. The 170 Hz shift default is used on
the Amateur bands.
• Menu No. 63 (MARK.POL): Allows reversal of the
key-down polarity between mark and space. The
default is space (OFF).
• Menu No. 64 (FSK.TONE): Switches between a
high tone (2125 Hz) and a low tone (1275 Hz). The
default is 2125 Hz. The high tone is commonly used
nowadays.
1 Select the operating frequency.
2 Press [FSK/–R] to select FSK mode.
AGC AUTO
3 Select the ALC meter function by pressing [METER].
7 9
S
50
FILTER
TM
or Clover for a
FSK