[McHUG] Re: Arduino Packet Transmission Working!

[n3sb at qis.net]

Hi Pat;

I have a couple TX-433 modules - one of which is a module you lent to me a
couple months ago. It'll be interesting to see if these modules can be coaxed
to send packet tones.

73; Steve, N3SB

Quoting Pat Kilroy <pat at patkilroy.com>:

> Steve,
> 
> Wow!  This is outrageously cool!  Congratulations!  
> 
> Yes, it is a big step for the PICetSat IIp if one 
> of those transmitter modules will pass the tones 
> without too much distortion.  
> 
> Can I give you a TX433B unit or two?  
> 
> Cheers,
> 
> Pat
> N8PK
> 
> 
> > -----Original Message-----
> > From: mchug-request at mailman.qth.net [mailto:mchug-request at mailman.qth.net]
> > Sent: Sunday, December 21, 2008 04:01 AM
> > To: mchug at mailman.qth.net
> > Subject: McHUG Digest, Vol 8, Issue 4
> > 
> > Send McHUG mailing list submissions to
> > 	mchug at mailman.qth.net
> > 
> > To subscribe or unsubscribe via the World Wide Web, visit
> > 	http://mailman.qth.net/mailman/listinfo/mchug
> > or, via email, send a message with subject or body 'help' to
> > 	mchug-request at mailman.qth.net
> > 
> > You can reach the person managing the list at
> > 	mchug-owner at mailman.qth.net
> > 
> > When replying, please edit your Subject line so it is more specific
> > than "Re: Contents of McHUG digest..."
> > 
> > 
> > Today's Topics:
> > 
> >    1. Arduino Packet Transmission Working! (n3sb at qis.net)
> >    2. Re: Arduino Packet Transmission Working! (Peter Morton)
> >    3. Re: Arduino Packet Transmission Working! (n3sb at qis.net)
> > 
> > 
> > ----------------------------------------------------------------------
> > 
> > Message: 1
> > Date: Sat, 20 Dec 2008 17:02:20 -0500
> > From: n3sb at qis.net
> > Subject: [McHUG] Arduino Packet Transmission Working!
> > To: mchug at mailman.qth.net
> > Message-ID: <1229810540.494d6b6c185c3 at webmail.qis.net>
> > Content-Type: text/plain; charset=ISO-8859-1
> > 
> > I finally found and fixed the last bug in my packet code. I can now send
> UI
> > packets from an Arduino!
> > 
> > This is a fairly huge step. It means that I've got the interrupt based
> frequency
> > generation right, the bit timing right, the data formatting right, the
> checksum
> > generation right, and the bit stuffing right, among other things.
> > 
> > The packet data frames I can now generate are Unnumbered Information (UI)
> > frames, which are fine for APRS purposes. It would be easy to add some
> > additional code to send telemetry info, like what the PICetSAT module does
> > today. The program only takes 4.2 kbytes right now, so there's 10 kbytes
> left
> > on a base Arduino for adding custom functionality.
> > 
> > There's another layer of protocol that still has to be worked out to
> connect to
> > another station (or allow another station to connect) and exchange data. 
> > 
> > I'll get that layer worked out after I get all the Packet Receive stuff
> working.
> > Receiving will be a bit easier to figure out now that I have a better
> > understanding of all the low-level formatting. 
> > 
> > I'll post the source code after getting it cleaned up and properly
> commented. 
> > 
> > On the hardware side, six resistors and a capacitor are needed to make a
> simple
> > D/A converter to generate reasonably clean sinewaves. An additional
> resistor
> > and an NPN transistor will have to be added (I haven't done this yet) to
> key a
> > transmitter. 
> > 
> > More to come. I'll have some time to continue this project over the
> holiday
> > break.
> > 
> > 73; Steve, N3SB
> > 
> 
> 
> 
> ______________________________________________________________
> McHUG mailing list
> Home: http://mailman.qth.net/mailman/listinfo/mchug
> Help: http://mailman.qth.net/mmmain.htm
> Post: mailto:McHUG at mailman.qth.net
>