Italian Wireless Systems
The Italian Navy was noted to use wireless during manœuvres in 1906, as they were intercepted by the British.
The use appears experimental and immature, with messages being nearly all en clair and using commercial procedural signs of "O K" and "T S T". It was further noted that "R D" was used in place of the British phrase "R R R".
Signalling was on wavelengths of 500, 1,200 and 2,500 feet and at speeds of 15 to 20 words per minute.
- Annual Report of the Torpedo School, 1907. Wireless Appendix p. 63.