[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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