[RTTY] Help with MMTTY

[Joe Subich, W4TV]

> To do this, I click on the waterfall until the signal appears around
> this frequency. It shows 500hz or so on the MARK box. When I go to
> transmit, it takes the MARK back to 2125hz. I don't think it did
> this before, but I don't remember for sure.

Turn on NET.

*WARNING* if you transmit AFSK with a tone below 1500 Hz you stand a
very good chance of also transmitting the second harmonic of the tone
and any tone below 1000 Hz has a very good chance of both second and
*third* harmonic unless your tones are absolutely clean and you take
extreme care to make sure that you do not overdrive the mic input of
your transceiver.

At the very least, enable the TxBPF (Option | Setup MMTTY |TX tab)
set it to 256 taps and 300 Hz to make sure you are not generating any 
harmonics or "clicks" in the sound card and do not set the Windows
sound output any higher than necessary to generate 90 W (with a 100W
transmitter) at maximum mic gain.

73,

    ... Joe, W4TV


On 2014-06-14 6:18 PM, John Geiger wrote:
> I recently did a reset on my netbook which completely cleaned the hard
> drive and reinstalled Windows, so I had to go thru and reinstall all of
> my programs.  One of them is MMTTY, which I now seem to be having some
> trouble with.  It defaults to Mark and Space frequencies above 2000hz
> with the normal shift of 170hz.
>
> However, I like to listen to RTTY at a lower pitch, like 500hz or so.
> To do this, I click on the waterfall until the signal appears around
> this frequency.  It shows 500hz or so on the MARK box.  When I go to
> transmit, it takes the MARK back to 2125hz.  I don't think it did this
> before, but I don't remember for sure.  Anyways, I can't seem to contact
> anyone now unless I tune the RTTY signal in at 2125hz as well.
>
> What do I need to do differently to get MMTTY working like it used to
> before?
>
> 73 John AF5CC
>
>
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