Timewave PK-232MBX, Руководство по эксплуатации, Страница: 78 / 231

PK-232 MBX – OPERATING MANUAL BAUDOT AND ASCII OPERATION
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CHAPTER 6 – BAUDOT AND ASCII RTTY OPERATION
6.1 Overview
Baudot (pronounced Bod-dough) has been around for many years. The five bit Baudot/Mur-
ray code was the basis of the Western Union Telex service and Baudot RTTY (Radio Tele-
TYpe) is still widely used on the HF amateur bands. The Baudot character set contains the
upper-case letters, the numbers 0-9 and some common punctuation characters. Because
Baudot has only five bits, it is less prone to errors than seven bit ASCII. Your PK-232 pro-
vides Baudot RTTY at all the standard speeds in use today, including all commercial speeds
up to 300 bauds.
ASCII – the American Standard Code for Information Interchange (pronounced Ask-kee) –
has been around for nearly 30 years. ASCII is a 7-bit code and was designed to overcome
the limitations of the Baudot character set by including both upper and lower case letters,
numbers, all punctuation as well as many computer control codes. ASCII is not so popular
on the amateur bands, but its operation is almost identical to Baudot RTTY so we will de-
scribe them both in this chapter.
6.2 Where to Operate Baudot and ASCII RTTY
Before you can operate Baudot or ASCII RTTY, you must first know where the activity is.
Most RTTY operation occurs on the 20-meter amateur between 14.08 and 14.10 MHz. RTTY
activity can be found on the other HF amateur bands as well and is most often located be-
tween 80 and 100 kHz up from the bottom of the band as it is on 20 meters.
6.2.1 PK-232 Baudot RTTY Parameter Settings
First you must enter the Baudot mode of the PK-232. If you are using a Timewave or AEA
PAKRATT program, follow the instructions in the program manual to enter the Baudot
mode.
If you are using a terminal, simply type BAUDOT or BA from the Command Mode followed
by the <Enter> key to enter the Baudot mode. The PK-232 responds by displaying the
previous mode:
Opmode was PAcket
Opmode now BAudot
Your PK-232's front panel will show the CMD and BAUDOT LEDs lit.
The following parameters are the most common settings for HF Baudot operation. Check
the parameters and make sure they are set as follows:
RBAUD 45 (this is the most common amateur speed on HF)
RXREV OFF
TXREV OFF
WIDESHFT OFF
6.2.2 HF Receiver Settings
Set your HF receiver (or transceiver) to Lower Sideband (LSB) unless you connected your
PK-232 through the direct FSK keying lines. In this case, you should select the FSK operat-
ing mode. Adjust the volume to a comfortable listening level.