Notebook T.C.1 Radiotelephone Transmitter Sketch Bivario receiver

Notebook with notes, drawings and diagrams, entitled Radiotelephone Transmitter T.C.1. In this notebook Idzerda kept the results from tests which he did with his transmitter PCGG. He made calculations and design drawings for new devices, or improvements to existing equipment.

Sketch for the front panel of the receiver type Bivario, with a calculation of the costs on the next page.