Here's something to check. The mic input jack is a monaural
input, but it requires a stereo plug, with audio on the tip,
and shield on the shell. There should be no connection to
the ring. There is a dc voltage on the ring that is used to
power electret mics, such as the usual computer mics. You
cannot connect a mono plug to the mic in jack. The plug has
to be a stereo plug, even though the ring is not used.
Dave Hachadorian, K6LL
Yuma, AZ
----- Original Message -----
From: "Gary Senesac AL9A" <al9a@pobox.mtaonline.net>
To: "Writelog Reflector" <writelog@contesting.com>
Sent: Tuesday, February 28, 2006 10:38 PM
Subject: Re: [WriteLog] MMTTY plug in problem
> 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" <cfmorris@bellsouth.net>
> To: <al9a@pobox.mtaonline.net>
> 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" <al9a@pobox.mtaonline.net>
>> > Subject: [WriteLog] MTTY plug in problem
>> > To: "Writelog Reflector" <writelog@contesting.com>
>> > 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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