[aprssig] APRS for your Hamfest

Scott Miller scott at opentrac.org
Fri Aug 3 22:12:22 EDT 2018

There are only two hard things in Computer Science: cache invalidation 
and naming things.

-- Phil Karlton

I like this variant:

There are 2 hard problems in computer science: cache invalidation, 
naming things, and off-by-1 errors. Scott
On 8/2/2018 7:51 PM, Lynn W. Deffenbaugh (Mr) wrote:
> One of my software mantras:   Naming can make or break a project!
> Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32
> On 8/2/2018 5:55 PM, Robert Bruninga wrote:
>> YES, I confused things.  The place to put the frequency and callsign 
>> and other info in an OBJECT is in the “comment” field of the position 
>> data.
>> Then we came up with the more efficient Mic-E format in 1995 or so 
>> and confused everyone by calling the 7 pre-selected status bits as 
>> COMMENTs, and called what was the Position comment field relabeled as 
>> STATUS,  Argh!
>> So yes, the added info goes into the comment field for an object and 
>> goes into the “status” field when using an APRS radio that transmits 
>> the Mic-E protocol.
>> Thanks for the catch.
>> Bob, Wb4aPR
>> *From:*Randy Love <rlove31 at gmail.com <mailto:rlove31 at gmail.com>>
>> *Sent:* Thursday, August 2, 2018 5:10 PM
>> *To:* Robert Bruninga <bruninga at usna.edu <mailto:bruninga at usna.edu>>
>> *Cc:* aprssig at lists.tapr.org <mailto:aprssig at lists.tapr.org>; 
>> hamfestgroup at w2mmd.org <mailto:hamfestgroup at w2mmd.org>
>> *Subject:* Re: [aprssig] APRS for your Hamfest
>> I didn't think auto-tune worked from the STATUS message packets, only 
>> in the comment part of a beacon, or as an object.
>> I could be wrong tho.
>> Randy
>> WF5X
>> On Thu, Aug 2, 2018 at 3:27 PM, Robert Bruninga <bruninga at usna.edu 
>> <mailto:bruninga at usna.edu>> wrote:
>>     ØI just read your post regarding Using APRS for Hamfest Support.
>>     http://aprs.org/hamfest.html
>>     Yes, you want two things.  A “HAMFSTxxx” Object say once an hour
>>     on the map for a week or so leading up to the event.  And then
>>     for the TALKIN station to have an APRS display in front of him so
>>     he can SEE people driving to the event who might call in.
>>     For the HAMFST object, You want an object that appears on the map
>>     as “HAMFSTxxx”.  You can use any APRS software or radio to do
>>     this.  You want to start transmitting it at least once an hour
>>     for the week or so leading up to the event. Maybe
>>     Since every hamfest in the world will be using the same object
>>     name “HFEST-xxx” you want to choose xxx to be unique so it
>>     doesn’t pingpong all over the world. That all fits in the 9
>>     character field limitation for an object.
>>     Use an APRS client that is on the air continuously to post the
>>     object.
>>     Another way without requiring an APRS base station is to just use
>>     an APRS radio (no attached APRS software) to generate the object,
>>     then only the new Kenwood THD74 can actually generate an object. 
>>     But you can cheat and use any other APRS radio to generate the
>>     object, but WITHOUT the xxx.  Because you will change the
>>     callsign of the radio to HAMFST-xx where xx is now the SSID
>>     number from 1 to 15 and “HAMFST” is the 6 character call.  This
>>     still makes it unique, but then if everyone that is going to have
>>     a weekend hamfest on the 15^th , uses 15, then it is not unique
>>     at all.  SO make something up.
>>     And to make that fake callsign(object) legal, be sure to put the
>>     legal callsign in the STATUS text.  In the status text is where
>>     you can say … “WNXYZ, on 16 Sept” for example.
>>     Then the other thing is to be sure that your TALKIN also has a PC
>>     in front of him.  And that the callsign of that station is TALKIN
>>     and be sure to put the repeater frequency in the STATUS text  in
>>     the format 146.940MHz de WBXYZ so that all mobiles can auto-tune
>>     to that frequency easily while driving.
>>     The HAMFST object ideas all use the object formats on the web page:
>>     http://aprs.org/localinfo.html which is a firehose of information
>>     Bob, WB4aPR
>>     *From:*hamfestgroup at w2mmd.org <mailto:hamfestgroup at w2mmd.org>
>>     <hamfestgroup at w2mmd.org <mailto:hamfestgroup at w2mmd.org>>
>>     *Sent:* Wednesday, August 1, 2018 2:37 PM
>>     *To:* wb4apr at amsat.org <mailto:wb4apr at amsat.org>
>>     *Subject:* APRS for our Hamfest
>>     Good Afternoon,
>>     I just read your excellent blog post regarding Using APRS for
>>     Hamfest Support.  The Gloucester County Amateur Radio Club will
>>     be hosting the ARRL Southern New Jersey Section Convention and
>>     Hamfest on Sunday, September 16, 2018.  This will be the 40^th
>>     anniversary of our Hamfest.  I am interested in using APRS for
>>     promotion of this event.  Where can I find information on the
>>     mechanics of posting this event on aprs.if?  Or is there another
>>     way to do this.  I do have a ZUMSPOT and noticed it can post APRS
>>     locations.  I wonder if we can use our club call sign to post the
>>     site of the hamfest?
>>     Thanks for any help you can offer.
>>     Mark H. Gottlieb, WA2DIY
>>     GCARC
>>     hamfestgroup at w2mmd.org <mailto:hamfestgroup at w2mmd.org>
>>     www.w2mmd.org <http://www.w2mmd.org>
>>     t
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