Chapter 6 Communicating; Ssb Transmission; Slow Scan Tv/ Facsimile - Kenwood TS-870S Instruction Manual

Intelligent digital enhanced communications system
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COMMUNICATING

SSB TRANSMISSION

SSB is now the most commonly-used mode on the HF
Amateur bands. This popularity is not surprising due to
its narrow bandwidth requirements and its good long
distance communications capability that demands
minimum transmit power when compared with other
voice modes. These reasons, combined with the fact
that modern Amateur transceivers deliver reasonably
good audio quality, make SSB the mode that most
prefer on HF. Due to this popularity, you will want to use
the technology available on the TS-870S as explained
in this and later sections to make your transmitted signal
the best possible.
Refer, if necessary, to "OPERATING BASICS"
beginning on page 19 for complete receiving details for
any mode.
1 Select the operating frequency.
2 Press [LSB/USB] to select either upper or lower
sideband mode.
AGC
AUTO
USB
3 Select the ALC meter function by pressing [METER].
7
9
S
50
FILTER
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 Speak into the microphone and adjust the MIC gain
control so that the meter reads in the ALC zone but
doesn't exceed the upper ALC zone limit.
Speak in a normal tone and level of voice.
Speaking too close to the microphone, or too
loudly, may increase distortion and reduce
intelligibility.
The ALC level is more restricted than previous
KENWOOD transceivers due to the added
benefit of the DSP-controlled Microphone AGC
function {page 47}.
With the Speech Processor switched OFF, the
CAR control has no function in this mode.
6 If you want to use speech processing, press [PROC]
to switch on the Speech Processor and adjust as
described on page 46.
7 Release the Microphone [PTT] switch, or press
[SEND] again, to return to the receive mode.
The "ON AIR" indicator goes out.

SLOW SCAN TV/ FACSIMILE

SSTV complements SSB operating since a voice
contact is established first before pictures are
exchanged. Though once a specialty mode involving a
very small percentage of Amateurs, slow scan television
is now increasing in popularity as a result of the
capability of computers.
No longer is it necessary to squint at an old CRT to view
a continuously fading image. It isn't necessary to invest
in a large amount of additional equipment anymore
either. SSTV can be a convenient method of adding
interest to otherwise routine voice contacts. Instead of
trying to describe your station, just show it. Many
Amateurs are only lacking a little application software
that uses your computer sound card for transmitting and
receiving monochrome or full-color SSTV images.
SSTV FREQUENCIES
IARU Region 1
(Europe/Africa)
Frequency (kHz)
3730~3740
7035~7045
14225~14235
21335~21345
28675~28685
The high resolution that is possible using facsimile
(FAX) can allow you to exchange more detailed
graphics than SSTV allows. Due to the longer
transmission times required for FAX, it's best to use this
mode when band conditions are stable with strong
signals.
Popular FAX frequencies include the following:
7245, 14245, 21345 (Intern. Net), 28945 kHz
Operation on SSTV or FAX mainly involves learning the
functionality of your computer application or accessory
hardware that supports these modes. Consult the
documentation that comes with your software or
accessory equipment.
When operating either SSTV or FAX, use a fast AGC setting
Note:
and switch OFF your Speech Processor for best results.
This completes the "SSB TRANSMISSION" section.
Refer to "OPERATING AIDS" beginning on page 44 for
information about additional useful functions for
operating.
U.S.A./Canada
Frequency (kHz)
3845
7171
14230
21340
28680
29

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