Collins R-388
Quoting their TM manuals, Radio Receiver R-388(A)/URR is a communications receiver, having excepcional frequency stability and calibration accuracy. The receiver covers the frequency range from .5 to 30.5 Mc. It is a 18 (19(A)) tube superheterodyne receiver for receiving AM phone signals an CW signals.
Collins R-388
Nomenclature Tag
| Frequency range | .5 Mc to 30.5 Mc |
| Receiver type | Single, double or triple conversion superheterodyne |
| IF frequency | 500 Kc |
| Number of tubes | 18, 19(A) |
| Tuning | Linear, divided into thirty 1 Mc tuning steps |
| Method of calibration | Built-in crystal oscillator (100 Kc) |
| Frequency stability | Over-all stability within 1 Kc for average conditions; within 2 Kc for extreme conditions |
| Output impedances | 4 and 600 Ohm |
| Antenna input impedance | Unbalanced to match short whip antenna (50 Ohm, 100 uuF) |
| Power requirements | 85 W at 115 or 230 VAC, 45 to 70 cps |
| Weight | 35 pounds |