Order Tray | Contact Us | Home | SIG Lists

[aprssig] aprssig Digest, Vol 70, Issue 17

Michael Chisena ka2zev at yahoo.com
Mon Apr 19 13:17:24 UTC 2010


Bob,
In your answer about....
 
BLENDING APRS: SEEMLESS INTEGRATION IN A MULTI-FREQUENCY       ENVIRONMENT 
 
You forget that we are getting good results here in Fairfax County with your 6M idea.
 
No expensive filter required, a ham radio store diplexer and multi band antenna works just fine. That's what I use in the car that you saw.
 
Go look at my traces from this mornings trip.
2M
KA2ZEV-8
6M
KA2ZEV-6
 
They work just fine.
 
Keep it safe
Mike


"You are, what you do, when it counts" 
The Masso

"Gravity, the quickest way down" 
Mayor John Almafi

"You ever drop an egg, and on the floor you see it break? 

You go and get a mop so you can clean up your mistake. 

But did you ever stop to ponder why we know it's true? 

If you drop a broken egg you will not get an egg that's new?" 

MC Hawking

--- On Mon, 4/19/10, aprssig-request at tapr.org <aprssig-request at tapr.org> wrote:


From: aprssig-request at tapr.org <aprssig-request at tapr.org>
Subject: aprssig Digest, Vol 70, Issue 17
To: aprssig at tapr.org
Date: Monday, April 19, 2010, 8:00 AM


Send aprssig mailing list submissions to
    aprssig at tapr.org

To subscribe or unsubscribe via the World Wide Web, visit
    https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
or, via email, send a message with subject or body 'help' to
    aprssig-request at tapr.org

You can reach the person managing the list at
    aprssig-owner at tapr.org

When replying, please edit your Subject line so it is more specific
than "Re: Contents of aprssig digest..."


Today's Topics:

   1. Re: aprssig Digest, Vol 70, Issue 16 (David Dobbins)
   2. Re: BLENDING APRS: SEEMLESS INTEGRATION IN A MULTI-FREQUENCY
      ENVIRONMENT (Bob Bruninga )
   3. NTRAK (Earl Needham)
   4. Re: Inexpensive APRS transmitter kit (Cap Pennell)
   5. Re: Inexpensive APRS transmitter kit (Scott Miller)
   6. Re: Inexpensive APRS transmitter kit (Scott Miller)
   7. Re: NTRAK (Andy AB9FX)


----------------------------------------------------------------------

Message: 1
Date: Sun, 18 Apr 2010 06:05:53 -0700
From: David Dobbins <ddobbins at gmail.com>
Subject: Re: [aprssig] aprssig Digest, Vol 70, Issue 16
To: aprssig at tapr.org
Message-ID:
    <v2ub481d0501004180605nd6756e10we6372a02fa3e52d7 at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Hi Lynn. Yes, the nwaprssig reflector is open and as already said, check the
http://nwaprs.info web page for the link to join that one. We'd be glad to
have you and anyone else on the aprssig join us.

Since one of your posts a couple weeks ago I have dl aprsisce and have it
running on my netbook which is usually what I take when travelling. For
internet access I use either wi-fi or my Blackberry Tether. I too would like
to see an app for the Blackberry (Storm). The idea you suggest below re RF
awareness in a local area is a good one, and I'd like to see further
development of this.

If your application resembled Google Maps Latitude that I have on my Storm
and PC, but integrated that APRS-IS data for the local area, w/o having to
go thru the "add friend" routine, it would be way cool. Scott (N7FSP),
mentioned from my big message, and I routinely follow each other's location
with Latitude, although Scott does need to remind me to update my position
fairly often "your position is stale", then I quickly cycle to GMaps for a
current position. If a one-line capability was built into this as well it
would be a good feature. Right now this aspect of our fun w/GMaps requires
those messages to go by SMS.

I do plan on having a presentation of the APRS capabilities of iPhone/iPad,
Droid, WMobile, and whatever else is out there for the web-phones at our
NWAPRS annual Summer Gathering Sept 10-12 at Valley Camp in North Bend, WA,
about 30 miles east of Seattle. It's a weekend full of APRS activities,
food, and fun. More info can be found on our website. If you're in the
area.....

David K7GPS

> Message: 3
> Date: Sat, 17 Apr 2010 21:35:43 -0400
> From: "Lynn W. Deffenbaugh (Mr)" <ldeffenb at homeside.to>
> Subject: Re: [aprssig] BLENDING APRS: SEEMLESS INTEGRATION IN A
>        MULTI-FREQUENCY ENVIRONMENT
> To: TAPR APRS Mailing List <aprssig at tapr.org>
> Message-ID: <4BCA61EF.6000504 at homeside.to>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> I've been thinking on a completely different but related question and
> have a possible suggestion to throw out on the table, but first...
>
> You mentioned a discussion on "the nwaprssig reflector".  Is this an
> open forum, and if so, where can I join?
>
> With the recent proliferation of Windows Mobile (APRSISCE), iPhone
> (iBCNU), Andoid (APRSdroid.org), and (hopefully soon) BlackBerry APRS-IS
> clients with internal tracking ability, I've been wanting RF awareness
> when one of these devices drives through my local area.  I'm considering
> adding an automatic "throttled" IGate capability to APRSIS32 that would
> detect APRS-IS-only devices, not heard on RF, within a configurable
> radius of the IGate which would then gate position beacons from -IS to
> RF at a configurable (and SLOW) rate with a very reduced path, just to
> have the RF environment become aware of the other stations in the area.
>
> This same approach might work for cross-band digipeating between your
> various frequencies.
>
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tapr.org/pipermail/aprssig/attachments/20100418/9dbc55e7/attachment-0001.htm>

------------------------------

Message: 2
Date: Sun, 18 Apr 2010 10:03:09 -0400 (EDT)
From: "Bob Bruninga " <bruninga at usna.edu>
Subject: Re: [aprssig] BLENDING APRS: SEEMLESS INTEGRATION IN A
    MULTI-FREQUENCY    ENVIRONMENT
To: "TAPR APRS Mailing List" <aprssig at tapr.org>, nwaprssig at nwaprs.info
Message-ID: <20100418100309.AEC67697 at msan1.usna.edu>
Content-Type: text/plain; charset=iso-8859-1

Regarding blending APRS 1200 and 9600...
I may not have fully digested all of the issues below, but a few immediate thougts some to mind...

1) The complaint of the D700 muting 144.35 while transmitting on 144.39 is unsolvable by any means on any radio or pair of radios.  There are no cavities on earth capable of separating a 144.39 MHz signal from a 144.35 transmitter only 40 KHz away.

2)  I am concerned at the use of 144.34 which in my mind has been designated for balloons, and ATV simplex for the last 30 years or more.  It is as standard to them as 144.39 is to us.  I would have grave reservations to permanent use of this frequency.  Of course, I steal it for 6 hours once a year for the annual Golden Packet event (aprs.org/at-golden-packet.html), but that is no longer than a single balloon event and in keeping with the intent of the frqeuncy.  that is a clear, experimental, short duaration frequency.

3) We have always promoted that the best way to do data blending on APRS is to combine everything heard on all input frequencies and then send it all on a single comon output channel at 9600 baud.  Unfortunatelyl, 144.39 has to remain as a primarily INPUT frequency so that traverlers will be seen.  So the regional output at 9600 should be on UHF somewhere else.  And beacons on the 144.39 digis should have FREQ OBJECTRS alterting the 144.39 travelers where to tune for the full feed 9600 system.

Just my 2 cents.  Wouild this work up there?
Bob, Wb4APR

Bob, WB4APR


---- Original message ----
>Date: Sat, 17 Apr 2010 17:37:36 -0700
>From: aprssig-bounces at tapr.org (on behalf of David Dobbins <ddobbins at gmail.com>)
>Subject: [aprssig] BLENDING APRS: SEEMLESS INTEGRATION IN A MULTI-FREQUENCY ENVIRONMENT  
>To: aprssig at tapr.org,nwaprssig at nwaprs.info
>
>   Hi all APRS and NWAPRS enthusiasts:
>   ?
>   Within the NWAPRS region a couple groups of hams
>   have been developing alternate APRS networks on
>   9600bd with great success. The project started
>   because the saturation of APRS activity on the
>   primary freq, 144.39 at 1200bd, particularly around
>   the Puget Sound region and Seattle. If you'd tune
>   into the 144.39 freq you'll rarely hear a quiet
>   moment, and we suspect upwards of 50% of the packet
>   activity never gets through due to collisions of u/i
>   packets. I suppose this is happening in other larger
>   metro areas around the country and with our overseas
>   friends.
>   The desire for further optimization sparked
>   experimentation of 9600bd APRS on both UHF and VHF
>   frequencies. Success was found on both bands, but
>   one draw back on UHF was locating a common freq that
>   could be expanded out of the Puget Sound region. We
>   still haven't discovered that common freq that will
>   work everywhere as we have on VHF, but we continue
>   experimenting on 440.800Mhz under the direction of
>   Bob (K7OFT) in Seattle. A typical WIDEn-N digi on
>   9600bd employs a Kenwood TM-D700 in some locations,
>   or an Icom IC-207 and Kantronics KPC-9612 in others.
>   Bob continues APRS development on?220Mhz around the
>   Seattle area as well. Bob (K7OFT)?has proven APRS
>   at 9600bd is a viable alternative to the crowded
>   1200bd activity on 144.39Mhz, but also notes that
>   while the D700 can DIGIPEAT in APRS Packet mode, it
>   does so with a limited set of commands. The D700
>   internal?TNC is?not fully compatible with what we
>   want to do within the compatibility
>   requirements.?The D700 is just about the?only rig
>   we can use if we stay on 144.350 and
>   144.390MHz.?The reason is because the D700 turns
>   off the receiver opposite of the band you are
>   transmitting on.?So if you transmit on 144.350 then
>   the receiver on 144.390MHz is shut off, and
>   vice-versa.?Otherwise the front end of the
>   listening receiver could suffer damage because the
>   40Khz?may be?too close to not cause problems. In
>   Bob's experimentation,?we believe that the only way
>   we can get around the limited commands problem is to
>   use Digi_ned at the digi site.?Bob (K7OFT)?also
>   notes we should be looking for an easy solution to
>   passing messages and one-liners to and from the
>   primary and alternate frequencies.
>   From early analysis we?discovered a new problem of
>   sharing data within the two environments in what
>   later evolved into the topic of this report, BLENDED
>   APRS DEVELOPMENT.? At our planning meeting for the
>   NWAPRS Summer Gathering Scott (N7FSP), brought up
>   "Blended APRS Networks" to allow the sharing of APRS
>   information across the various networks in the area
>   so that users were able to better share information
>   between networks without the use of the Internet.
>   Simply put, we haven't discovered an easy way to
>   implement the crossband sharing of data specific to
>   a mountaintop WIDEn-N digipeater. Our work
>   continues.
>   In steps Scott (N7FSP), and Casey (KJ7XE), who both
>   have interest and most importantly, mountaintop
>   access, where development of a VHF 9600bd experiment
>   could continue. Scott settled on 144.35Mhz as it
>   appears widely under-utilized across the spectrum.
>   The real "jewel" in this development was the
>   reduction in implementation cost by combining a
>   Kenwood TM-D700 and external Kantronics KPC-3 to
>   come up with one "easy" digipeater package resulting
>   in 1200bd and 9600bd APRS on VHF with no need for
>   another (UHF) antenna, feed line or coax, or other
>   ancillary equipment needed to install a separate UHF
>   radio at the remote location. The Kenwood D700 is
>   configured to digipeat APRS on the radio's A band on
>   144.35Mhz and internal TNC at 9600bd, while the B
>   band is tuned to 144.39Mhz and uses an external
>   KPC-3 set at 1200bd. The cost savings is better than
>   two separate radio systems at the mountaintop, and
>   upgrading a typical VHF radio plus KPC-3 digipeater
>   is easy; just replace the radio with a Kenwood
>   TM-D700 and you're in business on two freqs, one at
>   1200bd and the other 9600bd. The XTAL/CRYSTL
>   digipeater is the FIRST true "Double Sided Digi"
>   (quote to K7MCR) that we know of.
>   OK, so we have lots of room for growth at the 9600bd
>   environment, which means more data can be pumped to
>   the users on 9600bd. We're still working out exactly
>   what we want to expand with, but for the most part
>   there's room for those 10 second trackers or club
>   announcements and flood closure warnings or
>   whatever.
>   Now comes the problem we're attempting to resolve
>   now, with our BLENDED APRS DEVELOPMENT project. As
>   it exists now, two mobile travelers, one on the
>   primary freq 144.39Mhz at 1200bd, and the other on
>   the secondary freq 144.35Mhz or 440.800Mhz at
>   9600bd, both driving down I-5 equipped with Kenwood
>   TM-D710 radios and AvMap G5 GPSs, neither will know
>   of each other's presence unless they're both
>   communicating on a common voice frequency. A nearby
>   home station, typically setup for the primary freq,
>   will only see the one station unless his APRS
>   application, typically UI-View, is also pulling data
>   from the APRS-IS. Many don't, relying only on the RF
>   picture plotted on their screen. Another nearby home
>   station, new and improved, but monitoring only the
>   secondary freq with a 96kb-only TNC, will see only
>   the one station unless his APRS application is also
>   pulling data from the APRS-IS. A third home station,
>   pulling only the APRS-IS feed, may see both stations
>   while the fourth home station, with deeper pockets,
>   has UI-View running on his computer connected to a
>   KPC-9612 and two radios, one on 144.35Mhz or
>   440.800Mhz and the other 144.39Mhz.
>   From this comes our goal of blending the various
>   APRS frequencies and baud rates, preferably at the
>   mountaintop digipeater site, or at a home station,
>   to where other home and mobile stations are aware of
>   ALL APRS activity in their area, and the blend makes
>   it transparent for any user to access this data, and
>   include some filtering or adjusting of path
>   selection and other variables.
>   We continue our discussions on the nwaprssig
>   reflector, and have it included in our list of
>   presentations for the September 10th NWAPRS Summer
>   Gathering, more info for which can be found on the
>   http://www.nwaprs.info web site. Many thanks to Bob
>   (K7OFT) and Scott (N7FSP) for their assistance in
>   preparing this message for discussion.
>   ?
>   Regret I won't be able to attend the TAPR DCC in
>   Portland at the end of September, but wanted to get
>   this out there now in hopes there will be some
>   discussions on it here in the sigs and at DCC.
>   David K7GPS
>   Lead Coordinator NWAPRS
>   Home QTH Spokane
>   Sunning by the pool in Tucson
>________________
>_______________________________________________
>aprssig mailing list
>aprssig at tapr.org
>https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig



------------------------------

Message: 3
Date: Sun, 18 Apr 2010 14:45:02 +0000
From: "Earl Needham" <earl.kd5xb at gmail.com>
Subject: [aprssig] NTRAK
To: "TAPR APRS Mailing List" <aprssig at tapr.org>
Message-ID:
    <1958507622-1271601901-cardhu_decombobulator_blackberry.rim.net-1047571073- at bda2115.bisx.prod.on.blackberry>
    
Content-Type: text/plain

Is there an NTRAK expert here?  Or a web site or mailing list where I can get some instructions for the program?

Thanks,
Earl


KD5XB -- Earl Needham -- Clovis, New Mexico -- http://groups.yahoo.com/group/cw_bugs/  -- The Coast Guard has it right! -- ZUT  



------------------------------

Message: 4
Date: Sun, 18 Apr 2010 11:38:28 -0700
From: "Cap Pennell" <cap at cruzio.com>
Subject: Re: [aprssig] Inexpensive APRS transmitter kit
To: "'TAPR APRS Mailing List'" <aprssig at tapr.org>
Message-ID: <005301cadf26$5950a890$0bf1f9b0$@com>
Content-Type: text/plain;    charset="us-ascii"

Please remember in your search for hardware, especially at any elevation on
a shared ham frequency, any "transmit only, no signal detect" device is
always sadly sending "I'm proving _my_ unfounded vanity and greed but the
rest of you suck."
73, Cap

> -----Original Message-----
> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On
> Behalf Of Joshua Shriver
> Sent: Sunday, April 18, 2010 12:30 AM
> To: aprssig at tapr.org
> Subject: [aprssig] Inexpensive APRS transmitter kit
> 
> Sometime hopefully this year I'm hoping to release a weather balloon
> with a small payload for taking pictures, maybe other things via
> sensors.
> Wondering if there are any inexpensive, light-weight and low power
> aprs transmitters that can be used for such a thing.
> 
> Best I've found so far is the Byonic TinyTrak setup. Though it seems a
> bit pricey, though it's the best bet so far.  I've even looked into
> introduction DIY fm transmitter kits and can buy a APRS encoder for
> around $24 from another ham I know.
> 
> Any advice or recommendations would be appreciated.
> 
> -Josh




------------------------------

Message: 5
Date: Sun, 18 Apr 2010 16:35:39 -0700
From: Scott Miller <scott at opentrac.org>
Subject: Re: [aprssig] Inexpensive APRS transmitter kit
To: TAPR APRS Mailing List <aprssig at tapr.org>
Message-ID: <4BCB974B.20906 at opentrac.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I've got a few examples of a tracker board I build specifically for 
balloon use, but I'm out of MX146LV transmitters now.  Here's a little 
bit on the unit:

http://n1vg.blogspot.com/2010/03/balloon-launch.html

I've got another board revision on the way that's smaller, runs on a 9V 
battery, and will have support for a small camera for SSTV.

Right now the only problem is the availability of the MX146LV.  SRB was 
having some production problems last time I checked.

Scott
N1VG

Joshua Shriver wrote:
> Sometime hopefully this year I'm hoping to release a weather balloon
> with a small payload for taking pictures, maybe other things via
> sensors.
> Wondering if there are any inexpensive, light-weight and low power
> aprs transmitters that can be used for such a thing.
> 
> Best I've found so far is the Byonic TinyTrak setup. Though it seems a
> bit pricey, though it's the best bet so far.  I've even looked into
> introduction DIY fm transmitter kits and can buy a APRS encoder for
> around $24 from another ham I know.
> 
> Any advice or recommendations would be appreciated.
> 
> -Josh
> 
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 
> 




------------------------------

Message: 6
Date: Sun, 18 Apr 2010 16:38:04 -0700
From: Scott Miller <scott at opentrac.org>
Subject: Re: [aprssig] Inexpensive APRS transmitter kit
To: TAPR APRS Mailing List <aprssig at tapr.org>
Message-ID: <4BCB97DC.5040205 at opentrac.org>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

And an APRS balloon tracker that holds off while waiting for the channel 
to be clear will likely never get a packet out at altitude.  Unless 
you're on an alternate frequency, you just have to keep the power down, 
use a reasonable beacon rate, and limit the path.

Scott
N1VG

Cap Pennell wrote:
> Please remember in your search for hardware, especially at any elevation on
> a shared ham frequency, any "transmit only, no signal detect" device is
> always sadly sending "I'm proving _my_ unfounded vanity and greed but the
> rest of you suck."
> 73, Cap
> 
>> -----Original Message-----
>> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On
>> Behalf Of Joshua Shriver
>> Sent: Sunday, April 18, 2010 12:30 AM
>> To: aprssig at tapr.org
>> Subject: [aprssig] Inexpensive APRS transmitter kit
>> 
>> Sometime hopefully this year I'm hoping to release a weather balloon
>> with a small payload for taking pictures, maybe other things via
>> sensors.
>> Wondering if there are any inexpensive, light-weight and low power
>> aprs transmitters that can be used for such a thing.
>> 
>> Best I've found so far is the Byonic TinyTrak setup. Though it seems a
>> bit pricey, though it's the best bet so far.  I've even looked into
>> introduction DIY fm transmitter kits and can buy a APRS encoder for
>> around $24 from another ham I know.
>> 
>> Any advice or recommendations would be appreciated.
>> 
>> -Josh
> 
> 
> _______________________________________________
> aprssig mailing list
> aprssig at tapr.org
> https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> 
> 




------------------------------

Message: 7
Date: Mon, 19 Apr 2010 00:21:41 -0700
From: "Andy AB9FX" <ab9fx at aprs.pl>
Subject: Re: [aprssig] NTRAK
To: <earl.kd5xb at gmail.com>, "TAPR APRS Mailing List"
    <aprssig at tapr.org>
Message-ID: <25cfc523$2a630cfb$10237db2$@com>
Content-Type: text/plain; charset="us-ascii"

There is discussion on the APRS forum in 
Polishhttp://forum.aprs.pl/index.php?topic=864.0You can post in English. 
Registration on the forum is accepted only with ham radio 
callsign.73Andrzej SP3LYR, AB9FX

----------------------------------------
From: "Earl Needham" <earl.kd5xb at gmail.com>
Sent: Sunday, April 18, 2010 9:46 AM
To: "TAPR APRS Mailing List" <aprssig at tapr.org>
Subject: [aprssig] NTRAK 

Is there an NTRAK expert here?  Or a web site or mailing list where I can 
get some instructions for the program?

Thanks,
Earl

KD5XB -- Earl Needham -- Clovis, New Mexico -- 
http://groups.yahoo.com/group/cw_bugs/  -- The Coast Guard has it right! -- 
ZUT  

_______________________________________________
aprssig mailing list
aprssig at tapr.org
https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tapr.org/pipermail/aprssig/attachments/20100419/5f226bae/attachment-0001.htm>

------------------------------

_______________________________________________
aprssig mailing list
aprssig at tapr.org
https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig


End of aprssig Digest, Vol 70, Issue 17
***************************************
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.tapr.org/pipermail/aprssig/attachments/20100419/938f7f9d/attachment.htm>


More information about the aprssig mailing list