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Fial Incorporated
3142 12:2 70MHz IF Protection Switch
View larger photos of the 3142 12:2 70MHz IF Protection Switch
View larger photos of the 3142 12:2 70MHz IF Protection Switch
Key Features:

Multiple Input Protection Switch
    Fourteen Inputs
    Two Outputs
Any Input to Any Single Output
Switching Upon Remote Commands
Essentially Transparent to Signals
Multiple Power Supplies
    Two AC Power Supplies
    One DC Power Supply

Two outputs protected by fourteen inputs (all connections 75 ohm); protection via remote control; 50-90 MHZ bandwidth, no connectors in internal signal paths; 2 RU high; one 20 to 56 VDC and two 100 to 130 VAC power supplies; ultra linear; ultra reliable; often used for satellite up link protection

Model 3142 Characteristics
Channel Interfaces  
     Input Channels 1 through 12
     Input Protect Channels 1 and 2
     Output Protect Channels 1 and 2
     75 BNC Jack (female center pin)
     Insertion Gain Variation:
     Operating Frequency Range:
     Amplitude vs Frequency Response:
     Input to Input Crosstalk:
     Switching Time:
     Random and Spurious Noise:
     Group Delay:
Inputs and Outputs: 75Ω unbalanced
Inputs and Outputs: > 26 dB return loss
Input Power Level: -15 to +10 dBm
Output Level: Unity gain relative to input
< ±0.1 dB (70 MHz)
70 MHz ± 20 MHz
+0.0 to – 0.3 dB, 50 MHz to 90 MHz,
70 MHz reference
<-70 dBm on output, 0 dBm into other input
< 20 nsec
<80 dBm, all inputs terminated
< 1.5 nsec, over 70 MHz ± 20 MHz
Channel Switching  
     Any unselected input to either single output based upon external closure or serial signal
     Two Remote Closure Inputs:
          15 pin female D-Sub (DB15F) shielded
          Activation on closure to ground (Active Low) or on closure open from ground (Active High)
          Active Low or Active High switching mode user selectable
          Switching command delay user selectable (High Speed: < 10 µsec, Low Speed: > 50 msec)
     One Serial I/O Input:
          9 pin female D-Sub (DB9F) shielded, RS-422
          Consult factory for current protocols
Alarm and Status Outputs  
     9 pin female D-Sub (DB9F) shielded
     Individual closures indicative of Unit Fail, Channel to Protect 1 and Channel to Protect 2
     All closures are normally open closures between isolated pins
LED Indicators  
     Unit power OK, AC and DC Power Failure
     Indication of Channel Switched to Output Channel
     AC Power Consumption
     AC Input Power Range
     AC Power Connection
     DC Power Consumption
     DC Input Power Range
     DC Power Connection
30 Watts
100 to 130 VAC, polarized
3 prong IEC 320, grounded, RFI filtered
10 Watts
20 to 56 VDC, floating
Barrier Strip, two #6 screws
     Operating Temperature
     Humidity Range
     Storage Temperature
0 to +50° C
5% to 95%, Non-condensing
-40 to +70° C
Physical Characteristics  
     Shelf Size
     Rack Mounting
     Shelf Weight
3.50” H (2 RU), 19” W, 14” D
Flush with rack
12 pounds