[GreenKeys] Can we do tty 2 meters!>?AFSK ON FM? (was ] Hamtesting)

[COURYHOUSE at aol.com]

I have a  2 meter  Icom.. I  think  all  it   does is  FM. 
 
Probably  would be   good  NOT to  run it  on  full power  if  you  were 
send   a big   picture  file  eh!?
I am not  sure  how  well  these   units  do in a long  key down 
condition... Any  Advice!?
 
  I  have now   12  TUs  some  I  am  sure  are non-functional  museum 
display items    but  some  show  life  ...(time to start  testing   some...)
 
Larry... Gil.... want to experiment  with this  some!?
 
 
ED#  _www.smecc.org_ (http://www.smecc.org)  
 
 
In a message dated 11/19/2013 9:23:08 A.M. Mountain Standard Time,  
rmowery28146 at earthlink.net writes:

One interisting thig if you do run rtty by feeding the tones  into the mic 
or audio input of a transmitter.
 
If you want to send fsk by using computer sound cards or  other audio 
generators, set your transmitter to LSB.  This actually puts  the tones out 
inverted and stays with the old standard of the space being  actually lower than 
the mark frequency, but when received on lsb it is  reinverted so the space 
comes out of the speaker higher. Can be  confusing.  It does not really 
mater the actual frequency of the tones as  long as they are 170 hz apart.  You 
usually want them to be atleast 1500  hz so the filters in the transmitter 
will help eliminate the harmonics of the  audio if there is any.
The tuning of the receiver will take care of  that.
 
When using AFSK on AM or FM then you normally will use a  mark tone of 2125 
and space tone of 2295 which is 170 hz apart.  If using  other tones, the 
tuning of the receiver will not compensate for  that.
 
 

----- Original Message ----- 
From:  _Ralph Mowery_ (mailto:rmowery28146 at earthlink.net)  
To: _greenkeys at mailman.qth.net_ (mailto:greenkeys at mailman.qth.net)  
Sent: Tuesday, November 19, 2013 10:54  AM
Subject: Re: [GreenKeys] Can we do tty  2 meters!>?AFSK ON FM? (was ] 
Hamtesting)


Yes you can.
 
I am not sure about 6 meters, but from 2 meters on up it  is fine to do 
rtty on AM and FM using afsk.  You can also use fsk if  you want to.
 
A number of years ago a local group used 146.700 as the  standard FM rtty 
frequency.  This was later moved to the 220 mhz band  as more and more voice 
repeaters came on the air.  Not that they had  to,but just seemed like the 
ham thing to do at the time.
 





______________________________________________________________
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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20131119/10053088/attachment.html>