[GreenKeys] Fw: Different Type Of TU

[JC White]

heavy metal right now although I do have MTTY for glass...



     
----- Forwarded Message -----
 From: kn7sfz <kn7sfz at gmail.com>
 To: greenkeys at mailman.qth.net 
 Sent: Sunday, May 22, 2016 6:52 PM
 Subject: Re: [GreenKeys] Different Type Of TU
   
 What are feeding with your TUs John....heavy metal or computer...and if the latter, which program are you using to decode.
 
 Curious minds...etc.,
 
 Richard kn7sfz
 
 
 
 On 5/22/2016 18:45, JC White wrote:
  
  A couple of months ago I came across an article for constructing a TU that uses no tone filters at all.  The Dec 1991 issue of ELEKTOR, page 18 - 20, has an FSK decoder based on a pair of one-shots.  Basically, they are set to react to the period of an incoming tone, so actual shift is not very important.  Neither are the actual tones, as long as the periods of the one-shots are adjusted (somewhat).  Having tossed together the circuit I am rather surprised how well it works.  When I have more time I will play with the circuit more and see how it compares to my other TUs (ST-6, Dovetron, NS-1, several others). 
  By the way, do any list members recall mountain California TTY guy Grand Storey, who sold tone filters for many years?  Turns out I have an ancient TU with his filters it.  Doggone things works rather well!
  
  John WB6BLV
   
  
 
 
 
______________________________________________________________
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

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 jcw1231 at pacbell.net

  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20160523/4b8fced8/attachment.html>