ANG-DTV-A Datasheet, PDF (2/2 Pages) Micronetics, Inc. – AUTOMATED NOISE INSTRUMENTS FOR DTV/HDTV FIELD TESTS

Flexible Architecture - ANG Series Standard Options Include: How to order
OPT001: 0.1 dB noise amplitude control resolution: This allows the user to
set the noise amplitude to within 0.1 dB. Standard is 1.0 dB
OPT002: Carrier Signal input and built in combiner for S+N output. This is
useful for interference tests that require adding noise to a carrier signal.
OPT002A: This is similar to OPT002, but utilizes a resistive combiner in
order to preserve the low baseband frequency specification of those models
which have a low frequency specification of 100 Hz. This combiner has more
insertion loss than that of OPT002, so if frequencies below 10 MHz are not
required, then OPT002 makes more sense.
Instrument
Model:
Connector Type:
A=N (female)
B=BNC (female)
C=SMA (female)
Options
ANG-DTV - X
ANG-DTV-X - OPTXXX
OPT003: Signal Path Attenuator. This option allows the user to control the
amplitude of the carrier signal. The range and resolution is 0 - 127 dB in
1.0 dB Steps.
Model:
Options: (reference option chart)
OPT003A: This option is as OPT003 but the step size is 0.1 dB instead of 1.0 dB
OPT003B: This option is similar to OPT003 but the signal amplitude is "make before break" meaning the carrier signal is perpetually
transmitted through the attenuators even in the short transition from one attenuation state to the next. This allows the user to change
the amplitude in the signal path without losing lock; especially useful in modem loop back testing where a break in the IF connection
from the modulator to the demodulator requires the entire test to be reset.
OPT003C: Similar to OPT003B except step size is 0.1 dB.
OPT004: "Zero dB loss" signal Path: This option utilizes a high 3rd order intercept, low distortion amplifier in the signal though path to
make up for the insertion loss. This loss is caused by a combination of the path components that includes the coupler which sends a
portion of the signal to the power meter, the combiner which adds noise to the signal, the attenuator (if ordered) and the impedance
transformer (if ordered). The magnitude of the loss is from 5 to 12 dB depending on the model and option package ordered. Generally, if
the loss does not pose a problem, this option should probably not be ordered. Despite the high quality amplifier used, it is not generally
recommended to have any unnecessary active devices in the test signal path.
OPT005: 75 Ohm Impedance instead of 50 Ohm. Typical loss is 1 to 2dB from base model
OPT005A: Switchable Impedance 75 Ohm/50 Ohm
OPT005B: 75 ohm Impedance using internal resistive impedance matching pad for low frequency models to preserve the low end fre-
quency limit of 100 Hz. Loss is 6.0 dB from base model.
OPT005C: Switchable Impedance 50 Ohm/75 Ohm using resistance matching pad for 75 Ohm setting.
OPT006: RS/232 Interface This option allows the ANG to be operated remotely using an RS/232 serial connection in addition to the
GPIB bus.
OPT007: Automatic C/N, Eb/No, C/No ratio mode: This option sets up a user specified Signal:Noise ratio automatically. The user con-
nects a signal to the S input port of the ANG. The user needs to externally measure the signal power referenced to the S input port of
the ANG. The user then enters the signal power and the desired signal to noise ratio, and the ANG automatically sets it up calibrated
accurately to the S+N output port.
OPT007A: Similar to OPT007 but with the added feature that a power sensor for measuring the signal power can be connected directly
to the PM port of the ANG unit. The user simply enters the power reading from the external power meter into the ANG along with the
desired signal:noise ratio. The ANG automatically sets this ratio up accurately calibrated to the S+N output port. A directional coupler is
employed to send coupled power from the signal input path to the PM port. This allows the signal power to be perpetually monitored
without a break in the signal path with only small loss in the test signal through path. As with OPT007, this option can be combined with
the noise and signal attenuator options OPT001 and OPT002/A for greater ratio range/resolution.
OPT007A1: This option is similar to OPT007A except it enables the ANG to remotely control the power meter via RS/232 port. With
this option, the ANG automatically polls the power meter for signal power and uses the data to set up and maintain the user specified
S/N ratio. Because the power readings perpetually available, useful features such as "Ratio Track" and "Signal Track" are available.
The power meter must utilize SCPI commands. Not all power meter make/models are supported. Contact factory for details.
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