NST26L Micronetics Wireless, NST26L Datasheet - Page 2

• Manufacturer Part Number: NST26L
• Description: Broadband Coaxial Microwave Noise Sources
• Manufacturer: Micronetics Wireless

C
Each noise source is accurately calibrated using a reference noise source
traceable to NIST/NPL Calibration data consists of calibration points at 1 GHz intervals
across the fullband*. Data is supplied as a print out. Special calibration data can also be
supplied upon request (consult factory).
Standard choices are:
In addition to the calibration data, a certificate of calibration and a certificate of
conformance is supplied with each unit.
* 100 MHz intervals for the NSL-2
U
There are three primary uses for employing a noise signal for built-in-test.
noise source to supply a known excess noise ratio (ENR) to a device under test for a
Y-factor measurement. By taking two receiver readings, one with the noise on and one
with it off, Y-factor can be determined. By knowing the ENR and Y-factor, one can
calculate noise temperature (figure) or sensitivity.
replacement of a swept source to calculate frequency response of a receiver or other
device. By putting in a known spectral signal at the input and taking a reading at the
output, one can determine the gain or loss over frequency of the entire system. Noise
sources are inherently extremely stable devices. In addition, the circuitry is much simpler
than a swept source which increases reliability and lowers cost.
ence signal. By switching in the noise source from the live signal, a quick test can be
performed to check the health of the chain or calibrate the gain/loss. For this test, noise
can be injected into the IF system to test/calibrate its chain as well as the RF.
For more information on using noise for built-in-test, read the Feb 2004 Microwave
Journal article authored by Patrick Robbins of Micronetics.
http://www.micronetics.com/articles/microwave_journal_02-04.pdf
U
Calculating Y-Factor:
Calculating Noise figure from ENR and Y-factor:
Converting ENR to Noise spectral density (N
Calculating noise power in a given bandwidth (BW) from noise spectral density:
B
C
C
U
U
ALIBRATION
SING
SEFUL
ALIBRATION
SING
SEFUL
Y
source on and N
NF(dB) = ENR (dB) - 10 log10 (Y
0 dB ENR = -174 dBm/Hz
Power (dBm) = N
1. Noise Temperature (noise figure) or Sensitivity Testing: This test uses the
2. Frequency Response: The noise source being broadband can be used as a
3. Amplitude Reference Source: The noise source can be used as a known refer-
ROADBAND
OAXIAL
Fact
• More calibration points across the spectrum
• Special discrete calibration frequencies
• Data supplied in soft format as screen capture or text file on
floppy or CD-ROM
= N
N
N
N
OISE
N
OISE
2
OISE
OISE
/ N
1
AND
AND
F
F
M
1
OR
E
Where N
OR
E
0
is the measured power output with noise source off.
QUATIONS
QUATIONS
+ 10log(BW)
ICROWAVE
Q
Q
B
B
U A L I T Y
U A L I T Y
UILT
UILT
2
is measured power output with noise
-I
-I
N
N
-T
A
-T
A
Fact
SSURANCE
SSURANCE
EST
EST
-1)
N
:
:
OISE
0
):
:
:
S
OURCES
H
N S X X X X - X
Model
Bias Voltage
A = +28V
B = +15V
H
OW
OW
T
T
O
O
O
O
RDER
RDER
:
: