HI,
I've been reading this thread and feel I have to say my bit.
All you ops have super rigs which do RTTY.
Why do you persist in using audio for transmit for this mode?
Why do you put audio into the mic socket and not into the patch socket which
is designed for this, if you really have to use audio?
The best way of sending RTTY is through the digital port at the back of most
rigs.
I use WriteLog with MMTTY module, I set TX to COM 1 and send via the serial
port through 2 opto isolators and it's connected straight to the RTTY port at
the back of my FT1000MP Mk V, no magic box in between.
I have never had any problems and my signal will always be at the correct
amplitude, shift and frequency and never distorted. You run into problems using
audio especially putting into the front mic socket which is not tailored for
RTTY freq response. Also some rigs have audio TX DSPs which will distort a RTTY
audio generated signal.
Second thing is that I can now press the RTTY mode button on my rig and have
all the useful facilities or DATA filtering using DSP, which the rig provides
and CW filters which you can't in SSB mode.
If you are serious into contesting you are going to have to do it this way to
benefit from the narrow filters.
Here is a thought for everyone:
With today's rigs would you put the rig into SSB mode, key up and send CW using
an audio tone oscillator into a mic or patch socket when all you need to do is
select the CW mode button and send CW using the key?
I'll let you all think about that one :-)
Hope this helps,
Berni
GU0IDA
Gary Senesac AL9A <al9a@pobox.mtaonline.net> wrote:
Charlie,
Computer is a Compaq Presario laptop running WinME. I seriously doubt the
problem is the sound card driver, as the card works fb on PSK31, CW, and
SSB. It also works without a problem on the MMTTY stand alone software. It
is only when running the MMTTY plug in with WL that the card apparently gets
overloaded and desensed.
I've played with it a bit more today, with no success. I feed the receive
audio to the MIC IN of the soundcard from the fix audio output pin on the
ACC1 jack on the back of my IC-756PRO. Because this is generally too much
audio for the card I first route it to a Radio Shack stereo mixer where I
can use a slider control to adjust the output going to the soundcard. When
testing the differences between MMTTY stand alone and MMTTY plug in I notice
that the MMTTY stand alone will take significantly more audio input from the
mixer than MMTTY plug in will before the Overflow indicator comes on.
Again, no clue why that would be.
After transmitting with MMTTY plug in for WL, the spectrum display
continuously displays Overload, the tuning indicator is just a blob of white
dots and the audio wave indicator remains relatively flat never showing the
mark and space peaks for tuning. I suspect RFI of some sort, but darned if
I can understand why one program is immune and the other goosey! I tried
putting more turns on the torrid core on the input line to the soundcard
,but it didn't make any difference. I will have to scrounge up more torrids
and ferrite bars out of the junk box and trying adding more chokes on the
audio out to the radio too I guess. I know AA5AU's tutorial mentions RFI
problems on RTTY so I suspect this is going to take some time to correct
Now to get ready for the SSB test this weekend. Hopefully there won't be a
problem with that now too! Murphy lives!
Gary AL9A
----- Original Message -----
From: "Charles Morrison"
To:
Sent: February 26, 2006 8:33 AM
Subject: RE: MTTY plug in problem
>
> Gary,
>
> What type of computer are you using? Is this a homebrew or "built" one,
or
> is this a store bought box like Dell or Gateway? The important thing is
the
> soundcard.. Is it stock or is it an addon? The reason I ask is because I
> fought similar problems with my "built" computer using an OEM soundcard
that
> I bought on Ebay. There were no drivers for it, and although for playing
> windows sounds and such, generic Microsoft Drivers worked, I found that
> there were strange problems when I hooked the radio to it. Investigation
> with the serial number turned up several possibilities, but the FCC id
gave
> me the manufacturer (Creative) which wasn't stamped on the card.
>
> >From there, futher digging on the Creative site found me the correct
driver,
> which I used to replace the Microsoft driver and things worked fine. With
> the MS Driver I found:
>
> 1. Audio input was present regardless of if I used the Line In or the Mic
> In, and chose either one in the audio panel. IE: I could plug the radio
> into Line In, and in the sound panel on the computer choose Mic but I
still
> had audio.
> 2. There was a weird "residual" noise, whereby I had audio showing up
even
> if the rig was turned off, NOISE!
> 3. Level settings didn't seem to work correctly. I could turn the inputs
> all the way down and still have audio present in MMTTY. This is what
really
> blew my mind.
>
> Changing the driver fixed this permanently. Now, if Im plugged into the
> Line In and select Mic, the waterfall and such in MMTTY goes to a "dot",
no
> audio present. The inputs work correctly as well.
>
> I dug around on Google with the Model number printed on the card, used the
> FCC website to ID the card definitely by its FCC ID, and then found the
> correct drivers on Creative's site.
>
> Charlie
> KI5XP
>
>
>
> > Message: 3
> > Date: Sat, 25 Feb 2006 13:06:23 -0900
> > From: "Gary Senesac AL9A"
> > Subject: [WriteLog] MTTY plug in problem
> > To: "Writelog Reflector"
> > Message-ID: <003f01c63a57$b765b6a0$6401a8c0@presario>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > Way too late to get started on this, but I've been trying to
> > run the NA QSO Party RTTY edition using the MMTTY plug for
> > WL. At first my problem was no receive in MTTY. The band
> > scope remained unchanged no matter where I tuned, the
> > waterfall didn't work and the tuning indicator also wouldn't work.
> > Fiddled around a bit and tried changing the sound card
> > buttons from Mono to Left to Right. Finally got the sound
> > card to wake up and got receive going.
> > However, whenever I transmit, 100W, and go back to receive
> > the I'm back to no receive! Clicking on the sound board
> > buttons again restores it.
> > Transmit and it dies!
> >
> > My first suspicion was RF getting back into the sound card,
> > but I already have a big torrid choke on the line in and RF
> > feed back is not a problem on either CW or SSB. I shut down
> > WL and fired up MMTTY stand alone. Receives and transmits
> > just fine. No problem switching back from transmit to
> > receive. Why would the stand alone work OK and the plug in
> > be a brick???
> > Same hook up for both so I'm thoroughly stumped. Any
> > suggestions gratefully accepted.
> > Gary AL9A
> >
> >
> >
>
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