[GreenKeys] TTY on 40 meters

[Ralph Mowery]

----- Original Message ----- 
From: "Gary Chatters" <gcarlist at garychatters.com>
To: <greenKeys at mailman.qth.net>
Sent: Friday, March 30, 2007 8:48 PM
Subject: Re: [GreenKeys] TTY on 40 meters


> Larry Tighe wrote:
> [...]
>>
>> I will place my carrier on any freq near there, LSB and adding 2.125 to 
>> the freq readout should give me the Mark position.....yes?
>
> No.  LSB => signal transmitted is on the lower side of the carrier.
>
> Subtract 2125 Hz from the indicated carrier to get the on the air 
> frequency of mark.  That is, if your AFSK generator is producing 2125Hz 
> for mark.
>
> Actually, you probably want to decide where to put your mark frequency. 
> In which case you would add the 2125Hz to get the frequency at which to 
> set the carrier.
>
>
> It is good to hear about some real activity.  Unfortunately, I am not 
> ready to participate.
>
>
> 73,
> Gary

You are correct in what you are saying Gary.

There are 3 ways to describe a rtty signal I can think of right off.  One 
like you are telling of--the actual frequency.  The other that is not used 
very often it the average of the difference of the mark and space frequency 
(sort of an average frequency).

Then the one I have seen used most often in the ham bands is  just the 
frequency of the dial when the more common audio tone of 2125 hz is fed in 
to the audio input of a lsb transceiver.