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Fial Incorporated
3021 1:1 IF Protection Switch
View larger photos of the 3021 1:1 IF Protection Switch
View larger photos of the 3021 1:1 IF Protection Switch
Key Features:

Dual Input Protection Switch
        Two Inputs
        One Output
Either Input Switched to Output
Switching Upon Remote Commands
Front Panel Override
Essentially Transparent to Signals
Multiple Power Supplies
        Two AC Power Supplies
        One DC Power Supply

One output protected by two inputs (all connections 75 ohm); protection via remote or local 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 3021 Characteristics
Channel Interfaces  
     Dual Input Channels 1 and 2
     Single Output Channel
     75 BNC Jack (female center pin), all channels
     Insertion Gain Variation:
     Operating Frequency Range:
     Amplitude vs Frequency Response:
      70 MHz reference
     Input to Input Crosstalk:
     Input to Output Isolation:
     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 dBm on output, 0 dBm into other input
> 80 dB, 0 dBm into unswitched input
< 20 nsec
< 80 dBm, all inputs terminated
< 1.5 nsec, over 70 MHz ± 20 MHz
Channel Switching  
     Either input can be switched to the output based upon external closure or serial signal
     Switch commands are B Failed (switch A to output), A Failed (switch B to output)
     Front panel toggle switch sets priority mode (channel on line with no switch command)
          Auto – Ch A Priority (revertive, output on input A with no standing switch command)
          Auto – No Priority (non-revertive, output on last input with no standing command)
     Two front panel toggle switches for manual override
          Channel A Online or Normal (no front panel selection)
          Channel B Online or Normal (no front panel selection)
     Remote Closure Inputs:
          Barrier Strip, #6 screws
          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 Power Fail, Ch A on Output, Ch B on Output and Manual Mode
     All closures are normally open closures between isolated pins
     LED Indicators Unit power OK, AC and DC Power Failure
Indication of Manual Switch (Off Normal)
     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
9 pounds