CV89 interdigital magnetron (related to CV79 which is a frequency variant). This generates about 300mW at 6.3cm (4.76GHz).
The CV79 and CV89 were used in Wireless Set No.10, 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.
This file was last modified
10:46:27, Thursday April 14, 2022