[OZAPRS] Setting up TT4 Tx on 2m and more!

Thu Feb 18 14:03:59 EST 2010

For info on setting up your TT4 with Ui-View take a look at my wiki...
http://www.vk7hse.hobby-site.org/wiki/index.php/Uiview16/32 also I'm
assuming that you will use serial 1 for the PC link so set AMODE to KISS
and then restart the TT4.  You will need to construct a Y-splitter if
you intend to feed the GSP data directly to your TT4 or do you intend to
feed GPS data directly to Ui-View ?

On Thu, 2010-02-18 at 12:29 +1000, David and Justine Olsen wrote:

> Too late for my hair Ray.
> 
> 
> 
> I've moved on to the other part of my project now, and will go back
> over your email when I get back to the TT4 Tx issue.
> 
> 
> I've got a tracker to install in my aircraft an 8W unit from Byon. I
> want to set up a portable computer EEPC with TT4 and UIview at the
> gliding club, have a tracker in my glider and have its position shown
> on the EEPC.
> 
> 
> I'm running it now and it is being decoded by the TT4 via a Kenwood
> TM201A. I can see the decodes in Hyperterminal, of my tracker and
> other local APRS transmitters when TT4 is in text and when TT4 is in
> KISS mode. In KISS mode the first part of the transmission is
> gibberish in Hyperterminal - no problems.
> 
> 
> My problem is how to setup UIView in KISS mode to receive data from
> the TT4. The TT4 is setup in Alpha mode.
> 
> 
> As I said, Hyperterminal shows data received via the serial port, but
> I can;t get anything to appear in UIView.
> Can anyone point me to UIview KISS setup for TT4?
> 
> 
> Thanks for the audio stuff....I'll file it away for when I get back to
> that part of the project.
> 
> 
> David
> 
> 
> 
> 
> 
> 
> 
> 
> On 18 Feb 2010, at 12:14, Ray Wells wrote:
> 
> 
> 
> > David/All,
> > 
> > I'm not suggesting your problem is tone level related but failure to
> > grasp the following is arguably responsible for more TNC decode
> > issues than any other cause.
> > 
> > The need for "twist" adjustment depends on the radio hardware
> > involved so a brief discussion is probably in order.
> > 
> > The "norm" for an FM/PM radio is to apply 6dB (x2) per octave of
> > preemphasis in the transmitter. For packet, this results in the high
> > tone (2200Hz) having twice (near enough) the deviation as the low
> > tone (1200). In the receiver deemphasis is applied which restores
> > the audio to a "flat" condition, i.e. both tones going to the TNC
> > have the same level.
> > 
> > If TNC audio is fed into the microphone socket you can depend on 6dB
> > per octave preemphasis. However, if the TNC audio is fed in further
> > down the tx audio chain, such as the audio injection point for tone
> > signalling, preemphasis will not be applied in the tx and should be
> > applied externally - with twist, in the case of the TT4.
> > 
> > Going to the receiver again, if it receives a signal without
> > preemphasis, it will still apply deemphasis (assuming audio is taken
> > after deemphasis), resulting in the high tone being just half the
> > level of the low tone when fed to the TNC. FSK demodulators based on
> > the the  exar pair 2206/2211 will not decode if the high tone is
> > lower in amplitude than the low tone, by even a very small amount.
> > 
> > If rx audio is taken from the demodulator in the radio, i.e. before
> > deemphasis, the preceding is not a problem because audio that is
> > transmitted "flat" will be decoded "flat".
> > 
> > The exar chip set (found in genuine TNC2 TNC's)  is not disturbed by
> > high tone being considerably higher in amplitude than the low tone.
> > 
> > In summary, every tx should employ preemphasis, regardless of it
> > being generated internally, or externally. That will eliminate any
> > decode problems in TNC's with finicky chip sets because high tone
> > will always be the same level as, or higher than, the low tone
> > coming out of the rx.
> > 
> > David, is TXD 60 60mS or 600mS? Although TXD provides time for your
> > tx to stabilise before valid data is sent, it can also have an
> > impact on the remote rx in cases where muted audio is being used for
> > the TNC. There are some very sluggish receivers kicking about and
> > TXD needs to be long enough for that rx to unmute. My Icon handheld
> > scanner is pathetic in this regard, with the mute being so slow that
> > I can miss at least half of the digi beacon, even when I'm at the
> > digi site.
> > 
> > Get that CRO working and save your hair, lest you should end up like
> > me :-) 
> > 
> > Ray vk2tv
> > 
> > 
> > 
> > David and Justine Olsen wrote: 
> > 
> > > I am presently running TxD of 60 and TXTWIST of 50. I've tried a
> > > range of TXTWIST but none sound too different 
> > > 
> > > David
> > > 
> > > 
> > > On 18 Feb 2010, at 00:36, Scott Evans wrote:
> > > 
> > > 
> > > 
> > > > 
> > > > ABAUD is just the speed set for serial port 1 ... what TXDELAY
> > > > are you running? because depending on how quick you radio is you
> > > > may need to lengthen the delay a little, also check the TXTWIST
> > > > setting too, this controls the level between the 1200Hz & 2200Hz
> > > > tones.
> > > > 
> > > > On Wed, 2010-02-17 at 21:51 +1000, David and Justine Olsen
> > > > wrote: 
> > > > 
> > > > > ABAUD is set to 19200
> > > > > 
> > > > > 
> > > > > On 17 Feb 2010, at 21:37, Norm, VK3XCI wrote:
> > > > > 
> > > > > > Sort of like 9600 baud?
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > > > 73 de Norm, VK3XCI
> > > > > > Mildura, Australia
> > > > > > The Wintersun City
> > > > > > QF15bt.
> > > > > >
> > > > > > David and Justine Olsen wrote:
> > > > > >> I've gone through all of the TT4 audio adjustments as explained in
> > > > > >> the help docs by listening on another set, but still no success being
> > > > > >> received by any digis.
> > > > > >>
> > > > > >> One thing that has me curious, is the the squak from my Tx sounds
> > > > > >> nothing like those from others. The others are a deehdaaah kind of
> > > > > >> sound with two distinctly different tones ate the beginning and end
> > > > > >> tone, whereas mine is a sqaaaark :-) of mixed tones at the same time.
> > > > > >>
> > > > > >> David
> > > > > >>
> > > > > >> VK4MDX
> > > > > >>
> > > > > >> _______________________________________________
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> > > > 
> > > > -- 
> > > > Scott Evans <scott at vk7hse.hobby-site.org> 
> > > > 
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--
Scott Evans VK7HSE
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