Operation Model
8904A
Summation
You can sum
two,
three, or four channels together
into
a single output. You can
sum
two
or three
channels together to produce a composite modulation signal for modulating channel
A.
For instance,
you could use channels B and C to modulate channel
A,
and then
sum
channel D with the modulated
channel
A
signal. (Refer to
Operating Considerations: Summation
for additional information.)
Modulation
You can use one
or
more of the three additional channels to modulate channel
A.
(Only channel
A
can
be modulated.) Multiple channels can be summed together to provide composite modulation signals;
such
as
those used for FM Stereo broadcasts or VOR Navigation. (Refer
to
Operating Considerations:
Summation
for additional information on summing modulating signals.)
External modulation is not provided.
Sequencing
Sequencing allows you to output
a
sequence of Tone, DTMF (Dual Tone Multi Frequency), or Digital
signals. Each
of
the individual signals in a sequence can be defined
to
provide very exacting signaling
capabilities. Sequencing can be set to
run
continuously, or one sequence
at
a
time using manual control.
Tone Sequencing
-
You can specify up
to
16
individual tones; creating
a
sequence of up to
750
tones.
You can adjust the order of the tones
to
appear in any sequence. The Frequency, On Time, and Off
Time of each tone can be individually set.
DTMF Sequencing
-
The DTMF signals are the same
as
those used for tone-type telephone
communications. Sixteen different DTMF signals are available for creating
a
sequence of up to
750
tones. You can adjust the order of the tones to appear in any sequence. The On Time and
Off
time of
each tone can be individually set.
Digital Sequencing
-
Digital sequencing allows you
to
specify
a
series of digital on/off values to be
output. The Sequence Base, Period, On Level, and
Off
Level are adjustable. Sequences of up to
3000
bits values may be specified.
Hop
RAM Sequencing
-
Hop
RAM
sequencing offers a combination of the capabilities of tone and digital
sequence modes. Sixteen
signal
states can be preset, each with an associated amplitude, frequency,
and phase value. Sequences of up to
750
tones can be output if all sixteen output states (Hexadecimal)
are used. Sequences
of
up to
3000
tones can be output
if
only
two
output
states
(Binary) are used.
FA4 Stereo
-
The FM Stereo composite generator mode,allows the user to
test
FM broadcast stereo
receivers. All of the associated FM stereo signal parameters are adjustable for maximum flexibility.
Operating Considerations: Option
001
Summation
Summation may be done using many combinations of signal output and modulation schemes.
All combinations of channel summation are
acceptable, EXCEPT FOR [A+C and B+D] or
[A+D and B+C] at the same time. (You may not sum
two
sets of non-adjacent channels.) However,
you can sum and output
two
adjacent channels, such
as
B+C, and
modulate
channel
A
with the
non-adjacent channel D.
Abbreviated Specifications: Option
001
Abbreviated specifications are listed here to provide general operating guidelines. Complete detailed
specifications for options
001
to
003
are listed in Section
1.
Specifications for Option
005
and above
are provided in supplements at the end of this section.
3-10
rev.OlNOV89
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