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Microwave
Precision Calibrated Solid State Noise Sources ISSN series


Photo of noise source ISSN series

  • ENR 15 dB typical
  • High stability
  • Good flatness
  • No high voltage supply required
  • Compact solid state source
  • High reliability, rugged construction

Applications

  • Calibration
  • Noise figure measurement
  • Instruments and test equipment
  • Space and Hi-Rel systems

Description

ELVA-1 solid-state noise source ISSN series delivers a uniform level of noise power spectral density within the whole waveguide frequency range. Sources are available in eight waveguide bands covering 26.4-170 GHz (so called Ka; Q; U; V; E; W; F; D bands). The noise sources, which use silicon IMPATT diode as a base block, are compatible with many branded noisemeters on the market, for example HP 8970 or Ranatec Noise Figure Meter 7100. The supply voltage for Noise Sources is 28VDC with the current consumption of 60mA that ensure the compatibility with widely used noisemeters from third companies. This level of 60mA current consumption is true for all Noise Source models below 75GHz. For upper frequencies an external power supply (that come as shipment option) should be used, and +28VDC input should be attached to noise meter as usual. In this case it will be used for triggering (on/off switching of noise source).

The typical value of ENR is 15dB with a typical flatness of 1.5dB. All Noise Sources of ISSN series are shipped with Calibration Passports. High stability of the sources allows them to be used for test and instrumentation applications in replace of commonly used gas-tube noise sources. The additional advantage of silicon technology is low DC power requirements. This eliminates the need for complex high voltage supplies. There are two operation modes: CW mode and pulsed AM mode with modulation frequency up to 1 kHz. Typical value of excess noise ratio (ENR) as a function of frequency is given on the plot below:

Specifications

MODEL NUMBER

ISSN-28

ISSN-22

ISSN-19

ISSN-15

ISSN-12

ISSN-10

ISSN-08

ISSN-06

Frequency Band and Range, GHz

Ka

26.5-40

Q

33-50

U

40-60

V

50-75

E

60-90

W

75-110

F

90-140

D

110-170

Input waveguide

WR28

WR22

WR19

WR15

WR12

WR10

WR8

WR6

Wavequide Flange

UG-383/U

UG-383/U

UG-383/U-M

UG-385/U

UG-387/U

UG-387/U-M

UG-387/U-M

UG-387/U-M

Bandwidth, GHz (min)

Full

ENR, dB (nom)

15

14

13

13

13

12

12

12

Typical Flatness, dB

1

1.5

1.5

1.5

1.5

1.5

1.5

2

Stability, dB/C

0.01

Stability/Day, dB (typ)

0.05

Biasing Voltage, V

+18 or +28

Sizes, mm

Cylinder diameter/length

(without broadband isolator)

 

70/80

 

50/75

 

50/75

 

50/60

 

50/60

 

50/50

 

50/50

 

50/50


Notes
:

1. Maximum operating temperature is +60

2. Diode operating current is 50 mA.

3. A limiting value of modulation frequency is 1 kHz (external triggering).

4. Triggering signal amplitude is TTL level.

5. Bias voltage is +18 V. It is possible to supply the noise source with +28VDC biasing for the compatibility with commonly used noise meters.

6. External triggering connector is OSM(SMA)Jack.

7. ENR would be increased for narrower bandwidth. Please contact factory.

There are following controls and plugs on the control panel of the device:

Power connector. Specially supplied not SMA type to avoid possibility to change it with triggering plug. Few reply connectors are supplied together with the device.

  1. Triggering plug.
  2. Power switch.
  3. Power indicator.

Delivery time 6-8 weeks for all models. All ELVA-1 noise sources are warranted by the manufacturer for one year after receipt.

Power supply for input power 220VAC/50Hz, 110VAC/60Hz or 100VAC/50Hz are available optionally. For the precision control and fast modulation of the output power of the source Voltage Controlled Attenuator VCVA series would be supplied optionally.

How to Order :
Specify Model Number ISSN-XX-ABBC
XX- waveguide band (WR-Number)
A - flange type :
 
R = round or S = square (WR-28 only)
BB v ENR options (ENR in dB)
C v AC voltage power supply options
1 = 110 VAC/60Hz ,or
2 = 220 VAC/50Hz, or
3 = 100VAC/50Hz power supplies