CV79 interdigital magnetron (related to CV89 which is a frequency variant). This generates about 300mW at 6.6cm (4.55GHz).
The CV79 and CV89 were used in Wireless Set No.10 Mk.I, which played an important part in the WWII D-Day landings. This was a trailer mounted installation, using pulse modulation to enable 8-channels (e.g. 8 phone lines) over a 50 mile (optical) path. The associated receiver made use of the CV90. The Mk. II version used two CV228 Heil tubes in the transmitter instead of the CV79 or CV89.
| Heater voltage | 6.3V |
| Heater current | 200mA |
| Max anode dissipation | 8.5W |
| Magnetic field strength (approx) | 650H |
| Frequency | 4547MHz |
| Nominal output | 200mW |
| Pin | Function |
| 1 | Heater |
| 2 | n/c |
| 3 | Anode |
| 4 | n/c |
| 5 | n/c |
| 6 | Heater/cathode |
| 7 | n/c |
| 8 | Anode |
| 9 | n/c |
The 'interdigital' name
comes from the nature of the fingers shown in this picture.