Frequency range: 300 or 450 or 600 meters.
Power output: 250 watt 500 cps
Alternator output 120 VAC

Comments:

1) This set was designed primarily for vessels of a small tonnage.
2) No aerial ammeter fitted to this set.
 

Fig 266b -  Type P9 transmitter. set complete. Click on image to enlarge. (From Practical Wireless) The P9 was also furnished with a type 112 receiver, a type "i" aerial changeover switch, a type "C" Morse transmitting key and a 2000 ohm headphone.

Fig 266c - P9 Cargo set showing the general arrangement of the apparatus. Click on image to enlarge. (From Practical Wireless)

Figure 266d - Complete wiring diagram of the  P9 Cargo set. Click on image to enlarge. (From Practical Wireless)

This is  how the P9 set looked when installed aboard a submarine,  (From Wireless Age Jan. 1918, vol. 5 no. 4).

References:

1) Practical Wireless Telegraphy by Elmer E. Bucher, copyright  1917, Oct. 1918 edition
 

Feb 15/22
 
 

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