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VK7AX > APRS 10.09.09 14:04l 170 Lines 7246 Bytes #999 (0) @ WW
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Subj: [APRS] Digest Number 1854
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Sent: 090910/1149Z @:VK7AX.#ULV.TAS.AUS.OC #:10547 [Ulverstone] FBB7.00g $:VK7A
From: VK7AX@VK7AX.#ULV.TAS.AUS.OC
To : APRS@WW
There are 2 messages in this issue.
Topics in this digest:
1. FW: RE: [opentracker] Re: This is Probably an Ignorant Question, But
From: ray(AT)rayvaughan.com
2. ARRL/TAPR DCC (Digital Communications Conference) Forum Schedule Ann
From: Mark Thompson
Messages
________________________________________________________________________
1. FW: RE: [opentracker] Re: This is Probably an Ignorant Question, But
Posted by: "ray(AT)rayvaughan.com" ray(AT)rayvaughan.com ray_vaughan_99
Date: Wed Sep 9, 2009 3:55 pm ((PDT))
Cross posting my message on opentracker(AT)yahoogroups.com to hopefully find an interested developer:
> >This triggered an idea for a software developer out there somewhere....
> >
> >A new app that takes audio in on the sound card, then reports to a web site on
> >the apparent deviation.
> >
> >A RX on 144.39, hopefully somewhere high, in each major city. Discriminator
> >audio would be connected to the input of the sound card. The RX/Computer
> >combination would have to be calibrated with a service monitor. Basically, in
> >the software the peak-to-peak voltage of each tone would be converted to a
> >deviation level. The packet's callsign, a time stamp and deviation would be
> >stored to a database. Every minute or so, an update to a web page would be
> >ftp'ed to a remote web server. So if I was testing, I would go to the web
> >page and I would see an entry like this:
> >
> >Call Time Low Hi Raw Packet
> >KD4BBM-1 20090909181720 3.3 1.1 KD4BBM-1>...
> >
> >I would know to bring up the deviation of my high tone. The 3.3 and 1.1 would
> >be deviation in kHz.
> >
> >Any noise that couldn't be decoded, or failed the error check would also be
> >logged so you might see where you failed.
> >
> >For extra credit, the software might be able to calculate the distortion in
> >the sine wave of each tone so you could fine tune for maximum clarity and
> >minimize clipping.
> >
> >If this is helpful, maybe a standalone device could be developed. Audio in,
> >Ethernet out.
> >
> >Ray, KD4BBM
> >
>> >>Well,
>> >>
>> >>It appears now that my OpenTracker/VX-6 combo is functioning, but not sending
> >
>> >>out a readable/legible signal/packet.
>> >>
>> >>I would like to decode a packet from my system to see if it's correct, but it
> >
>> >>appears that to so, I will be off on another wild goose chase... gathering
>> >>cables, soundcard interfaces and software, then trying to get them all to
>> >>connect my VX-6/OpenTracker to my laptop sound card.
>> >>
>> >>So... being unable to decode a packet... for the moment, I will assume that
>> >>the packet contents are fine. That leads to a possible issue with something
>> >>called "deviation".
>> >>
>> >>The OpenTracker guide says..."If you have a deviation meter or service
> >monitor
>> >>available, set the transmit level to achieve a maximum deviation of about 3.2
> >
>> >>kHz for VHF FM 1200 baud operation.
>> >>
>> >>(Sorry.. I left my deviation meter in my other suit... in the same pocket
> >with
>> >>the Interocyter that Gort gave me.)
>> >>
>> >>"If you aren't able to directly measure the deviation, use another radio to
>> >>listen to the transmitted audio."
>> >>
>> >>(Great... My 'Other Radio' is mounted in the same vehicle where the
>> >>VX-6/OpenTracker combo-burger is set-up.)
>> >>
>> >>About all I can think of doing is to drive back into Cody and park somewhere
> >
>> >>that I get WiFi... watch APRS-FI on the laptop while I screw with the
> >settings
>> >>on the OpenTracker.
>> >>
>> >>Well, could be worse... I am further along than I was this time yesterday.
Messages in this topic (1)
________________________________________________________________________
________________________________________________________________________
2. ARRL/TAPR DCC (Digital Communications Conference) Forum Schedule Ann
Posted by: "Mark Thompson" wb9qzb_groups(AT)yahoo.com wb9qzb_groups
Date: Wed Sep 9, 2009 7:15 pm ((PDT))
ARRL/TAPR DCC (Digital Communications Conference) Forum Schedule Announced
TAPR is the premiere national digital organization covering all digital voice & data technologies and digital techniques such as SDR. More information about TAPR can be found at: www.tapr.org
TAPR is active throughout the year. At the Dayton Hamvention TAPR sponsors a digital forum and a joint banquet with AMSAT. TAPR publishes a quarterly journal, the PSR and develops digital techniques such as SDR. TAPR holds in conjuntion with the ARRL an annual national Digital Communication Conference. You can follow TAPR's activities, events & updates regularly
on Twitter at: www.twitter.org/taprdigital
The ARRL/TAPR DCC (Digital Communications Conference) will be held on September 25 - 27, 2009 again in the northwest suburbs of Chicago at the Elk Grove Village Holiday Inn near O'Hare airport with a free hotel shuttle bus.
The DCC has something for everyone from those new to digital modes to those experienced with digital communications.
The DCC has 2 full days of Technical forums on Friday & Saturday. On Saturday there is an additional
concurrent track of Introductory forums. On Sunday morning there is a 1/2 day technical session which is a deep dive into
one or more digital topics, such as SDR.
The DCC is well known for introducing new technologies & concepts. This year presentations include:
* Two Ham DTV, Digital Television presentations by Art, WA8RMC & Ken, W6HHC.
* "Use of Digital Communications at the Marine Corps Marathon in Washington D.C." by Tom, N4ZPT.
* "Universal Ham Radio Text Messaging" by Bob Bruninga, WB4APR, creator of APRS.
After the Friday night social we plan to have another D-STAR get together.
The Saturday night banquet speaker will be Bill Brown, WB8ELK. Bill is a pioneer in flying BalloonSats,
balloons with payloads including amateur radio digital communication technologies.
You can learn more about the DCC & register on-line at: www.tapr.org/dcc
Registration is preferred prior to September 17th for planning purposes, but walk-in registrations will be accepted.
If you can't attend the DCC the Proceedings can be purchased at the TAPR web site at: www.tapr.org/pub_dcc.html
Starting last year, 2008 and continuing this year DCC presentations are being recorded by
Amateur Radio Video News. DVDs of the prresentations are available at: http://www.arvideonews.com
If you have any questions you can reach the TAPR Office at: taproffice(AT)tapr.org
Look foward to seeing many of you at the DCC.
73, Mark, WB9QZB
DCC Local Co-Host
Chicago, IL
The 2009 DCC forum & speaker schedule is attached & is available online at the TAPR web site at:
http://www.tapr.org/pdf/DCC_2009_Schedule_Preliminary2009-09-08.pdf
Messages in this topic (1)
**********************************************************************
ABOVE IS A CROSS POST TO THE PACKET RADIO NETWORK IN AN EFFORT TO
PROMOTE FURTHER INTEREST IN APRS AND PACKET RADIO
Courtesy Tony VK7AX VK7AX(AT)VK7AX.#ULV.TAS.AUS.OC
**********************************************************************
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