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COOLED SYSTEMS
(see also QuinStar QCA series)

View of S- X-Band Cooled System with CTI Model 22 Refrigerator

 

The Dewar outer (left) has been removed to show the gold plated radiation shield.   Also shown is the front wall of the  Dewar with the waveguide-to-coax   adapter attached via the fiberglass spider thermal barrier.

We supply complete cryogenically cooled systems containing our line of Ultra-Low-Noise cooled HEMT amplifiers. These systems include the closed cycle helium refrigerator (CCR), vacuum dewar, cooled amplifiers, power supplies and remote control monitor unit. Standard models are available in the frequency ranges indicated below.

The amplifiers are cooled to 20 Kelvin in the dewar, where they are interfaced with low loss gapped waveguide. Low loss stainless steel coax lines are employed at the lower frequencies. Vacuum instrumentation and a cryogenic thermometer are included, and a remote helium compressor is supplied with a set of 1 Of flexible helium lines. In addition a post amplifier of approximately 20 db gain can be provided to overcome subsequent filter and mixer losses.

The standard system employs the Cryogenic Technology (CTI) model 22 refrigerator. For faster cooldown and more cooling capacity the CTI model 350 refrigerator is supplied at additional cost. 

Model Number Freq. GHz Noise Temp. Gain dB
L-22H 1.4-1.7 8K 30
SX-22H 2.2-2.45
8.2-8.8		 10K
12K		 30
30
C-4.0-30-350C 3.7-4.2 10K 30
C-22H 3.7-4.2 12K 30
XA-22H 8.18-8.98 15K 30
X-8.5-30-350C 8.2-8.5 12K 30
XB-22H 10.2-10.7 20K 28
K-15-30-350C 14.0-16.0 20K 25
K-22H 14.7-15.3 30K 28

General Specifications:

Gain Flatness +/-1.5dB
Gain Ripple +/-0.2dB/50MHz
Group delay, Linear 0.01 nSec/MHz max.
1 dB Gain Compression +5 dBm min.
3rd Order Intersept +15 dBm
Input/output VSWR 1.25:1 max.
Input Connector Waveguide/Type N
Output Connector Type N
Phase linearity 5 deg.  max. deviation from linear

  • Improved input VSWR of 1.2:1 is available with Model suffix-1, which incorporates a cooled input isolator at extra cost.
  • CTI Model 350 Refrigerator and Model 8200 Compressor
  • Power Supply: Berkshire Model PS-3D and PS-6C
  • Temperature Readout: Lakeshore Model 201
  • Vacuum Gauge: Hastings Model EVT-6A