[aprssig] APRS-B?

PE1RDW aprs at pe1rdw.demon.nl
Tue Jun 25 08:23:21 CDT 2013


Sounds like you want to use the opentrac protocol http://opentrac.org

-- 
73 Andre PE1RDW

On Tue, 25 Jun 2013 11:48:24 +0200, Andrew Rich <vk4tec at tech-software.net>  
wrote:

> My dream is to have 19k2 400 MHz
>
> Manchester encoded
>
> Then each message has defined message types
>
> 00 - General ident
> 01 - Position report
> 02 - GPS info
> 03 - Velocity info
> 04 -
>
> 99 - Reserved emergency
>
> - Andrew -
>
> -----Original Message-----
> From: aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] On  
> Behalf Of Scott Miller
> Sent: Tuesday, June 25, 2013 8:01 AM
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] APRS-B?
>
> I think the RFM12B code for the OTUSB is already published to SVN.  I
> don't mind sharing that at all.  I don't remember what's different about
> the RFM22 modules, but I'd prefer to stick with whatever is most  
> flexible.
>
> Scott
> N1VG
>
> On 6/24/2013 2:31 PM, John Wiseman wrote:
>> I posted a message about 6 months ago about experiments with the RFM22B
>> (100 mW) and RFM23BP (1 Watt modules). I also obtained a couple of the
>> RFM12B (500 mw) units, but I found the interface much more difficult,
>> and would recommend the 22/23 modules. I made a board for the Raspberry
>> PI, and it seemed to work pretty well. and at $25 seems reasonable, but
>> for a simple dig function the code could probalby run on the PIC.
>> As I do a lot of sailing in the summer, the project has been put on hold
>> till the Autumn, but if anyone is interested in preogressing the ideas,
>> I can publish the board design and code.
>> To save you trawling throught the archive, I'vr repeated the message  
>> below.
>> 73, John G8BPQ
>>
>> A while ago (22 September) Bob posted a message about the RFM22 modules.
>> I was working on a TNC for the Raspberry PI at the time, so decided to
>> try building a TNC round these modules. There is a photo of the result  
>> here
>>
>> _https://dl.dropbox.com/u/31910649/RMF22BTNC.png_
>>
>> The board is the same size as the PI (about the same as a credit card).
>> This one is fitted with the RFM22B module, with 100 mW output, but the
>> board will also take the 1 Watt RFM23BP. Although designed to work with
>> the PI, it also has a header for a serial to USB converter, so it can be
>> used as a standalone KISS TNC.
>>
>> To test as a tracker I lashed up a board to connect the Adafruit
>> Ultimate GPS Breakout board. Photo here:
>>
>> _https://dl.dropbox.com/u/31910649/S1360001.jpg_
>>
>> I've now got them running, and just completed my first tests. On the
>> first trial with the 100mW version I achieved a range of just under a
>> mile, with a
>>
>> 5/8 over 5/8 70cms whip on the car, and a far from ideal Marine Band
>> whip at base (The 70 cms colinear I bought for the test turned out to
>> have an infinite SWR!).
>>
>> Although very much a work in progress, I thought I'd share results so
>> far - if anyone else is working with these modules I'd be interested to
>> hear from them.
>>
>> BTW, the GPS module is pretty neat as well - it is about an inch square,
>> and includes a data logger - _https://www.adafruit.com/products/746_
>>
>> 73, John G8BPQ
>>
>>  
>>
>>
>> ------------------------------------------------------------------------
>> *From:* aprssig-bounces at tapr.org [mailto:aprssig-bounces at tapr.org] *On
>> Behalf Of *Robert Bruninga
>> *Sent:* 24 June 2013 13:55
>> *To:* aprssig at tapr.org
>> *Subject:* [aprssig] APRS-B?
>>
>> I’m impressed with the 500 mw transceivers on 433 MHz costing $20 or so
>> and operating at 9600 baud.
>>
>> Why don’t we call this APRS-B (plan B).  And start paralleling our
>> network with these devices.
>>
>> Then instead of only 5% of hams having APRS capability, we could get
>> more people in the clubs to own a device and also to put one up at home
>> so we have a backup data channel as well?
>>
>> Maybe lots of you are doing this alrady and I am the last one to the
>> party.  But whatever we do, lets standardize on something so we are all
>> headed in the same direction.
>>
>> These are wideband devices, so they are not compatible with any existing
>> APRS or other ham FM radios.  That is why it is a fresh start.  What is
>> the sync and key up time?
>>
>> Sure the range of 500mw is small, but at only 10% of the cost of a digi
>> we can put them at more and closer places and even solar power them.
>>
>> Bob, WB4APR
>>
>>
>>
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