[WriteLog] RTTY question

Don Hill AA5AU aa5au@bellsouth.net
Tue Jan 21 01:43:17 EST 2003

Check out "Getting Started on RTTY" at www.aa5au.com/rtty.html.

Also, installing the MMTTY plug-in for WriteLog at www.geocities.com/writelog.

FSK is direct on/off keying of the FSK input to the radio.  If you are using MMTTY
or the MMTTY plug-in for WL, then this on/off keying is done via a COM port using
an interface as described at http://www.aa5au.com/rttyinterface.html.  The output of
this circuit gives you on/off or open/short circuit to the input of the FSK input to the
radio.  If an open to the FSK input results in a SPACE tone, then a short circuit will
result in a MARK tone or vice versa depending on how the FSK menu setting is in your
radio (some older radios have FSK polarity switches inside the radio).  Using FSK
allows you do use the narrow filters in your radio.

AFSK is sending audio from your sound card to an audio input of the radio either
via a mic input or audio input on an accessory jack.  The radio is operated in the LSB
position (although many Europeans still use USB).

As Zev mentioned, there may be radios that allow you to use audio into your radio
and it still operate in the RTTY or FSK mode but I'm not familiar with that setup.

Using FSK or AFSK is simply a matter of choice.  It makes no difference to the
receiving station.  Your signal will be received the same either way.

There are advantages and disadvantages to using either way.

Read "Getting Started on RTTY" and you can then make the choice that is best for you.
But considering the fine radios you mentioned, I strongly recommend you use FSK to
key your radios.

I will be glad to help you with any questions you might have.

73 & looking forward to seeing you in the next RTTY contest!

----- Original Message -----
From: "Dennis" <roofus@sbcglobal.net>
To: <WriteLog@contesting.com>
Sent: Monday, January 20, 2003 6:29 PM
Subject: [WriteLog] RTTY question

Being new to WL, RTTY and contesting in general I have many questions and try to read as much as I can to answer them be for I ask.
Here are 2 I'm not sure of. 1) My ICOM 775DSP has a RTTY mode setting, 2) My KNWD TS-2000 has a FSK mode.  MMTTY says to use LSB.
What do I use on my rig to run RTTY?.  If there is a MMTTY reflector I probably should ask the questions there but I haven't found
it yet.

Thanks and 73,
Dennis  AB8NI

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