[OZAPRS] Setting up TT4 Tx on 2m and more!
David and Justine Olsen
davejust at bigpond.net.au
Thu Feb 18 15:11:02 EST 2010
thanks Scott
On 18 Feb 2010, at 13:03, Scott Evans wrote:
>
> 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
>>>>>> >>
>>>>>> >> _______________________________________________
>>>>>> >> OZAPRS mailing list
>>>>>> >> OZAPRS at aprs.net.au
>>>>>> >> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>>>> >>
>>>>>> >>
>>>>>> >>
>>>>>> -----------------------------------------------------------------
>>>>>> ----
>>>>>> >> ---
>>>>>> >>
>>>>>> >>
>>>>>> >> No virus found in this incoming message.
>>>>>> >> Checked by AVG - www.avg.com
>>>>>> >> Version: 9.0.733 / Virus Database: 271.1.1/2692 - Release
>>>>>> Date:
>>>>>> >> 02/17/10 06:35:00
>>>>>> >>
>>>>>> > _______________________________________________
>>>>>> > OZAPRS mailing list
>>>>>> > OZAPRS at aprs.net.au
>>>>>> > http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>>>>
>>>>>> _______________________________________________
>>>>>> OZAPRS mailing list
>>>>>> OZAPRS at aprs.net.au
>>>>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>>>>
>>>>>
>>>>> --
>>>>> Scott Evans <scott at vk7hse.hobby-site.org>
>>>>>
>>>>> -- This email and any files transmitted with it are
>>>>> confidential and intended solely for the use of the individual
>>>>> or entity to whom they are addressed. If you have received this
>>>>> email in error please notify the system manager. This message
>>>>> contains confidential information and is intended only for the
>>>>> individual named. If you are not the named addressee you should
>>>>> not disseminate, distribute or copy this e-mail. Please notify
>>>>> the sender immediately by e-mail if you have received this e-
>>>>> mail by mistake and delete this e-mail from your system. If you
>>>>> are not the intended recipient you are notified that
>>>>> disclosing, copying, distributing or taking any action in
>>>>> reliance on the contents of this information is strictly
>>>>> prohibited.
>>>>> _______________________________________________
>>>>> OZAPRS mailing list
>>>>> OZAPRS at aprs.net.au
>>>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> OZAPRS mailing list
>>>> OZAPRS at aprs.net.au
>>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>>>
>>>
>>> _______________________________________________
>>> OZAPRS mailing list
>>> OZAPRS at aprs.net.au
>>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>>
>>
>> _______________________________________________
>> OZAPRS mailing list
>> OZAPRS at aprs.net.au
>> http://lists.aprs.net.au/mailman/listinfo/ozaprs
>
> --
> Scott Evans VK7HSE
> Phone: +61362291658
> Mobile: +61417586157
> Skype: vk7hse
> scott at vk7hse.hobby-site.org
> http://www.vk7hse.hobby-site.org
> PGP/GPG Key ID 437E00F9
>
>
>
> -- This email and any files transmitted with it are confidential
> and intended solely for the use of the individual or entity to whom
> they are addressed. If you have received this email in error please
> notify the system manager. This message contains confidential
> information and is intended only for the individual named. If you
> are not the named addressee you should not disseminate, distribute
> or copy this e-mail. Please notify the sender immediately by e-mail
> if you have received this e-mail by mistake and delete this e-mail
> from your system. If you are not the intended recipient you are
> notified that disclosing, copying, distributing or taking any
> action in reliance on the contents of this information is strictly
> prohibited.
> _______________________________________________
> OZAPRS mailing list
> OZAPRS at aprs.net.au
> http://lists.aprs.net.au/mailman/listinfo/ozaprs
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.aprs.net.au/pipermail/ozaprs/attachments/20100218/e042ab33/attachment-0001.htm
More information about the OZAPRS
mailing list