CV2381 / N1034A backward wave oscillator
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This valve measures 260x125mm overall and has a 7 pin base |
This is an S-band backward wave oscillator.
| Nominal heater voltage (a) | 6.3V |
| Max heater current | 2.6A |
| Max surge heater current | 4.0A |
| Min delay line voltage (b) | 150V |
| Max delay line voltage (b) | 1.17kV |
| Max delay line current (c) | 50mA |
| Max delay line dissipation | 60W |
| Max anode voltage | 200V |
| Max anode current | 30mA |
| Max negative grid voltage (d) | -100V |
| Min power output | 20mW |
| Min total tuning range (g) | 2400 to 4500MHz |
The output terminal and metalwork are intended to be operated at earth potential.
(a) The heater voltage shall be applied at least two minutes before the HT voltages are applied
(b) The delay line voltage must always be applied before the anode voltage
(c) The delay line and collector are connected internally so 'delay line current' includes collector current
(d) For normal operation the grid is set at zero volts. Oscillations are cut off at Vg=100
(e) The magnetic field required to focus the electron beam is provided by a permanent magnet. External magnetic fields or ferro-magnetic objects might distort the focussing field and cause issues such as noise and modulation. Magnets or ferrous objects should be kept at least 8 inches away; 18 inches if low noise output is required.
(f) The temperature at any point on the external surface should not exceed 200°C. Minimum air flow directed onto the radiating fins and side of the valve should be 20 cubic feet per minute
(g) The valve is tuned by varying the delay line voltage. 150V gives 2400MHz and 1170V gives 4500MHz.
(h) The base is rigidly attached to the metal shell. The pins must be connected by flexible leads
| Pin | Function |
| 1 | Heater |
| 2 | Cathode |
| 3 | Anode |
| 4 | Grid |
| 5 | Delay line and collector |
| 6 | Delay line and collector |
| 7 | Heater |
