Other Functions; Software Module B - Wavecom W 4010 User Manual

If the preliminarily entered baudrate has too large a difference with respect to the actual baudrate, the IAS-
BAUDRATE measurement can take a very long time. The keys [F2] and [F3] can step the baudrate up or
down.
The baudrate adjustment via keys [F2] or [F3] is also important for simplex ARQ signals, which often can
not be measured. With preselection of the IAS-BAUDRATE, simplex ARQ signals can be measured (SITOR-
ARQ, SI-ARQ, SWED-ARQ, DUP-ARQ).
Measurements to 1/1000 Baud can be false due to differences in the quartz oscillators. These false measure-
ment can be compensated and corrected using a CONSTANT. The best calibration reference is the FEC-A
long wave signal. Measure this signal for 10 minutes with IAS-BAUDRATE. Now use the key [BU-ZI] to adjust
the QFC-FACTOR (abt. 10 to 40) as close possible to 96,0000 Baud. The key [BU-ZI] has a repeat function.
Multiple Scroll Inhibit (MSI)
Eliminates multiple scrolls (line feeds) on the screen and printer. A paper and screen space saving device
when the sending station sends more than one. Press the appropriate keys [BU-ZI] and [F2] to indicate MSI
ON or MSI OFF on status line.
Unshift on Space (UOS)
When 'on' the Unshift on Space causes the data output to automatically shift to 'Letters' case upon receipt of
a "space" character. Press the appropriate keys [BU-ZI] and [F1] to indicate UOS ON or UOS OFF on status
line.
Polarity Display
Press the appropriate keys [BU-ZI] and [F3] indicates NOR or INV polarity on status line if the microproces-
sor is synchronized.
Video display 40×18 and 80×24 lines
Each press of [BU-ZI] and [F4] buttons changes from one video mode to the other.
[F1] SPEED CHECK
[F2] BAUDRATE SELECTOR
[F3] MODE RECALL
[F4] FORWARD SEQUENCE
[F4]+[F3] REVERSE SEQUENCE
After choosing ARQ-E, the Baud rate is set to the default of 96 Baud, however this can be changed with
function key [F2]. The Baud rate measured by using function key [F1] remains stored (for all modes) until a
new measurement is performed. After the decoder has synchronized to the ARQ-E signal it displays the rep-
etition cycle (4 or 8) which gives clues concerning the same radio net. The function key [F3] should be
pushed after every station or frequency change.
The synchronous full-duplex single-channel ARQ (automated request) has become an important communica-
tions mode. Single-channel ARQ uses a parity check to recognize transmission errors. The procedure is that
the receiver returns a question mark to the transmitter for each detected error. The transmitter then re-
transmits the last 3 or 7 characters which it precedes with a question mark. To keep the 2 stations synchron-
ized, both stations transmit carrier and information continuously. If there is no information, then a bit pat-
tern (Idle character) is used for modulation.

3.4 OTHER FUNCTIONS

3.5 SOFTWARE MODULE B

ARQ-E
Displays the baud rate
Selects standard or variable Baud rates(as obtained from the
[F1] measurement)
Redisplay of the mode as well as resynchronization
go to next operating mode
go to previous operating mode
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