| 001 | Add IF switching circuitry |
| 908 | Rack Flange Kit for Use without Handles |
| 910 | Additional operating and service manual |
| 913 | RAck Mount Flange Kit |
| H05 | .5GHZ-20GHZ MIXER S-PARAMETER TEST SET |
| H30 | 2-20GHZ 3 PORT TEST SET |
| H51 | HI PWR (ALLOWS) EXTERNAL AMP |
| H61 | MIXER PULSE 1-50GHZ |
| H80 | Unknown |
| H81 | Reduced frequency to 18GHz |
| H88 | 800MHZ-18GHZ FREQUENCY |
| K04 | |
| K07 | |
| K30 | IF MUX SWITCH CONTROL |