[Milsurplus] OT Single wire landline telegraph

[Michael A. Bittner]

The 1K2 is a Chinese 1L4.  Same pinouts as the 1L4 except its suppressor grid comes out on Pin 5 instead of being internally connected to the filament as in the 1L4.  Mike, W6MAB

  ----- Original Message ----- 
  From: Jay Coward 
  To: armyradios at yahoogroups.com ; milsurplus at mailman.qth.net 
  Sent: Thursday, August 09, 2012 6:38 PM
  Subject: [Milsurplus] OT Single wire landline telegraph



  Greetings Groups,
   I have recently aquired two Chineese military telegraph sets. From the data plate inside the cover they are "63******".  *= chineese character. Included were headsets and keys.  The manual is in Chineese but the schematic is conventional and the accessories include a ground stake and connecting cable, and the units have one binding post for connection to another devece or network. The main switch seems to be "OFF,SEND, RECEIVE" (or rx,tx).
   I am aware of single wire systems but I really know nothing about them.
   A system useing the "earth" would imply that there must be some impedance in the ground return. I am guessing here.
   Can these one wire sets be operated as 2 wire sets by connecting gound to ground?
   The sets have one tube, a 1K2; I don't know if that is stricktly a Chineese tube or if it has equivelents on the common marketplace.
   Any info is wellcome. I will try to coax some of my co-workers to do some translation for me but they are somewhat reluctant when dealing with anything related to what they escaped from.

  Jay KE6PPF
  ______________________________________________________________
  Milsurplus mailing list
  Home: http://mailman.qth.net/mailman/listinfo/milsurplus
  Help: http://mailman.qth.net/mmfaq.htm
  Post: mailto:Milsurplus at mailman.qth.net

  This list hosted by: http://www.qsl.net
  Please help support this email list: http://www.qsl.net/donate.html