KG-227 and KG-228  (Pegasus Flight Units)


Introduced in 1996, this device is used for satellite telemetry, and as a mission data encryptor and as a command link decryptor.

KG-228/228 photo by Ralph Simpson

* Cryptographically-compatible with the KGV-227 VLSI microcircuit and Pegasus Ground Unit (MYK-17)
* Differential ECL Data 1/0 for the KG-227 and TTL-compatible for the KG-228
* Same footprint as KG-46 flight unit
* Configurable for encryption or decryption
* Key index and fill commands
* Removable key PROM assembly
* Components meet Level S requirements of MIL-M-38510 and MIL-STD-883
* Endorsed by NSA for Type 1 applications. Radiation hardened for space applications.
* Single-Event Upset (SEU) resistant


Data Rates
KG-227: 1 Mbps to 100 Mbps
KG-228: 250 bps to 10 Mbps

Operating Voltage: 28 Vdc (20-50 Vdc)
Power Consumption:
KG-227: 18 W (max.)
KG-228: < 4 W

Data Interface: I/O--TTL, CMOS
Key Selection: 64 keys
MTBF: >200 K hours per MIL-HDBK-217E
Technology: 1.2 micron Triple Level Metal Bulk CMOS gate array
Size: 5.7" x 4.4" x 3.1"
Weight: 3.2 lbs.

Contributors and Credits:

2) Ralph Simpson <ralphenator(at)>

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Apr 7/12