[Elecraft] RTTY via FSK-D

[Brian Alsop]

Comment on the FSK circuit.
MMTTY used to send upside down in FSK and there was no way to change it 
via software.
It is possible the circuit may have to be modified to invert the polarity.

73 de Brian/K3KO

Dave Hachadorian wrote:
> Comments interspersed.
> 
> Dave Hachadorian, K6LL
> Yuma, AZ
> 
> --------------------------------------------------
> From: "Brett Howard" <brett at livecomputers.com>
> Sent: Thursday, March 04, 2010 1:11 AM
> To: <elecraft at mailman.qth.net>
> Subject: [Elecraft] RTTY via FSK-D
> 
>> So I'm thinking about wiring up the FSK IN pin on the AUX 
>> connector to
>> do RTTY TX "properly".  I'm curious of a few things before I 
>> take the
>> time to make the cable.
>>
>> First off how do people usually drive this signal?  I assume 
>> its usually
>> taken off of a serial port...
> 
> 
> Yes, circuit is shown here:
> http://www.aa5au.com/rttyinterface.html
> 
> 
> 
> 
>  I've tried a few RTTY apps and I've
>> gotten them all to work via AFSK and all seem to have their 
>> pros/cons.
>> I have a feeling in the end that I'll probably most use MMTTY 
>> being that
>> it has a very nice interface into N1MM (unless there is another
>> application that has a nice interface into N1MM that I should 
>> be aware
>> of).
> 
> 
> MMTTY is the way to go.
> 
> 
>> Finally my last question is that if this comes off of a UART 
>> how has the
>> timing been for people?
> 
> 
> The timing is solid.
> 
>  
> 
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