Marconi Instruments 2955 - Page 60

OPERATION
(23)
Press
the key
which
is
arrowed
by NEXT
TONE to
step the
flashing
cursor
to
the
required
tone
number under the
FREQ
column.
(24)
Any
frequency
between
20 Hz and
20
kHz
can
be
assigned
to
any
tone
number
between
0 and
14.
Increment
sizes
for the tone frequencies
are
0.1
PJz from
20
Hz
to
3.2766
kHz
and
1 Kz
from 3.277
kHz to 20
kHz.
Enter
the
frequency
using
the
keypad
(J),
ending
with
the
frequency
terminator
(7)
• This
moves
the
cursor down
ready
for
the
next
entry.
(25)
Complete
the
sequence
by repeating
(23)
and
(24)
as
necessary.
(26)
Set
the
tones
generation
period by pressing the key
which
is
arrowed by
DURATION
and
then entering the
duration in
ms using
the keys
0
to 9.
Terminate
by pressing
the
key which
is
arrowed
by ms.
(27)
To
select
the
required tone
sequence,
press
the key
which
is arrowed
by CON-
TINUE to
return
to
RX SEQUENTIAL
TONE.
Note
Extended
tones
are
always
10 times the
user-defined
duration.
(28)
To
reuim
to
RECEIVER
TEST, press the key
which
is
arrowed
by
RETURN.
Note
...
This
user-defined
data
is stored in
non-volatiie memory.
Duplex
mode
To generate
a
programmed
calling-tone
sequence
in
duplex mode,
proceed as
follows:-
(1)
Follow
the
instructions for
interconnections and
general operating
procedures
given
under
‘Duplex
operation’.
(2)
Continue
from
(4)
of
‘Receiver
test’.
Note
...
Tones
cannot
be
received
in duplex mode. To
test
the
reception of
a
calling
tones
sequence,
leave
duplex mode
by
following
the
instructions
given
under
Transminer
test’.
3-3S
46881-622N
Apr. 83