| Mastr II Aux Receiver | ||||||
| Product Code 70 | ||||||
| Mechanical Package | Options | Channel Spacing | Frequency Capacity | Options | Frequency Range | Oscillator Stability |
| R | 1 | 4 | A | S | 12 | A |
| 12 VDC Rec w/o AMU | Standard | 20 KHz | 1 Freq | Standard | 25-30 | +-0.0005% |
| M | 2 | 5 | G | 13 | B | |
| 12 VDC Rec w/AMU | NF | 25 KHz | CG & UHS Rx | 30-36 | +-0.0002% | |
| S | 3 | 6 | N | 23 | E | |
| 121 VAC Rec w/o AMU | VTB | 30 KHz | Noise Blanker | 36-42 | +-0.0001% | |
| T | 4 | P | 33 | |||
| 121 VAC w/AMU | SOR | UHS Receiver | 42-50 | |||
| W | 5 | U | 44 | |||
| 121 VAC Rec in Wall Mt. Cab | NF / VTB | Channel Guard | 66-78 | |||
| 6 | W | 45 | ||||
| NF / SOR | CG & NB | 77-88 | ||||
| 7 | 56 | |||||
| LRC | 138-155 | |||||
| 8 | 66 | |||||
| LRC / NF | 150.8-174 | |||||
| 9 | 77 | |||||
| LRC / VTB | 406-420 | |||||
| A | 78 | |||||
| LRC / SOR | 420-450 | |||||
| B | 88 | |||||
| LRC / NF / VTB | 450-470 | |||||
| C | 89 | |||||
| LRC / NF / SOR | 470-494 | |||||
| 91 | ||||||
| 494-512 | ||||||
| 96 | ||||||
| 806-825 | ||||||
| NF=Secur-it Tone Notch Filter | ||||||
| VTB=Voting Tone Board | ||||||
| SOR=Sq Operated Relay | ||||||
| LRC=Line Response Compensator | ||||||