[GreenKeys] Model 28 ASR short on current loop interface.

[paul cembura]

 Hi allYes the line shunt relay in the LESU puts a short on the line.
Paulmr_rtty
    On Monday, April 20, 2026 at 05:06:05 PM PDT, Duncan Brown via GreenKeys <greenkeys at mailman.qth.net> wrote:  
 
  Charlie,
 
 Some units will put a short on the line when the power is off to the unit.
 
 Good luck,
 
 Duncan
 K2OEQ
 
 
 On 4/20/2026 6:25 PM, Charlie Beck via GreenKeys wrote:
  
 
 Hello, 
  I have a model 28 ASR wired in half duplex. I had been successfully using it with an interface I am building until it stopped operating. I measured the resistance of the loop and it's a dead short. After unpluging evreything from the Electrical Service Unit there is still a short on the loop. I checked the coils and they are not shorted. I am not very knowledgeable on the workings oif these machines apart from the basics. Is there anything that come to mind that might be the source of my problem? 
  Thanks,  Charlie Beck    
  ______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

 
 
 
 Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
 
 
 
 This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to duncanancy at earthlink.net 
 ______________________________________________________________
GreenKeys mailing list
Home: http://mailman.qth.net/mailman/listinfo/greenkeys
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:GreenKeys at mailman.qth.net

>>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
>>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to rttyelectronics at yahoo.com  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20260421/791058d4/attachment.html>