Marconi Instruments 2955 - Page 15

GENERAL
INFORMATION
AND
DATA;
Tone
decoder
faciiides:
Tone
encoder
facilities:
Display
tone
number,
frequency
and
percentage
error.
Screen indicates null
tones
(using
CRI^ and
annotates
out-of-Iimit frequencies.
Send
continuous,
burst, single
step, extend
5th
from
last
tone;
null, repeat
or frequency
shift
up to
±9
% in
1% steps.
User-defined:
Allows
definition for decode or encode
of
up to 15
tones.
Frequency
range
is
300 Hz
to 3.4
kHz
(decode)
and 20 Hz to 20
kHz
(encode)
with
a
duration
of 25 ms to 1.2
s
(decode) and
10
to
999 ms
(encode).
Up to a
maximum
oC
12 tones may
be
received
and
a maximum
of
1 1
tones
may be sent
at
any one time.
Frequencies
are
retained in
non-
volatile
memory.
Two-tone
modulation:
In TX
mode,
using tones menu,
generates
1 kHz
fixed
plus
that from the AP
generator.
In
RX mode,
e.xternal modulation
inputs add
to
internal
modulation.
Ip
output
socket
Frequency:
110
kHz
nominal.
Level:
180 mV
minimum.
Impendance:
50 n,
maximum
load
5
kH.
Bandwidth:
50 kHz
to over
350
kHz.
--
External
standard
input
socket
i
.[
Frequency:
1
MHz.
Level:
100
mV
to
3
V
RMS.
Impedance:
10
kn
in parallel
with
approximately
100
pF.
:
Demodulation
output
socket:
For
listening
to
demodulated
output and
AF
input.
;
:
Level:
-
400
mV
p-p
for kHz
deviation,
±10%.
'
Impedance:
10 kCl
nominal.
1
'
Bandwidth:
300 Hz
to
3.4
kHz band-pass.
300 Hz
low-pass or 15
kHz
low-pass
selected
by
front panel
filter switch.
Accessory
socket:
Pins
1.
3,
4,
5, 6.
7
designed
for
future
options.
Pin
2.
4=12
V
at
approximately
100
mA,
Pin
7.
,AP
output,
1
W
into 8
Pin
1,
pulse
output available
under
GPEB
control.
approximately
600 ns.
^6881-622N
Apr.
88
1-15