[OZAPRS] Problem getting Tinytrak 3 going
Andrew Rich
vk4tec at tech-software.net
Sat Jul 4 04:15:29 EST 2009
Do you have a TNC or can you install sound card packet
Or wasn;t there a program that decodes packet ? a sound card one ?
You need to confirm what you are sending.
Go back to basics and turn all the fancy smart junk off .
----- Original Message -----
From: "Richard Murnane" <Richard.Murnane at internode.on.net>
To: "Australian APRS Users" <ozaprs at aprs.net.au>
Sent: Friday, July 03, 2009 10:51 PM
Subject: Re: [OZAPRS] Problem getting Tinytrak 3 going
> Hi Mark,
>
>> No, there's no channel busy light.
>
> In this case, you should turn up your Rx volume (with the squelch
> open) until it comes on, then turn up the squelch. If you still get no
> busy LED on, then you probably have a cable problem and your TT3 will
> transmit blind, so risk collisions and packets getting lost.
>
>> Based on Peter's comment, I turned off smart beaconing, and now it's
>> keying the transmitter, but still nothing showing up on aprs.fi.
>
> It could be just the beacon text packets you're hearing, which as I
> said before won't show a position.
>
>> I can hear my packets going out on the other 2m rig in the car, but
>> perhaps I'm overdriving it. I'll have to check the devation.
>
> It would be helpful if you could check the actual packets being sent
> too.
>
> Also, if you can plug the GPS into a terminal program and see what's
> coming out. You should see $GPRMC sentences:
>> RMC - NMEA has its own version of essential gps pvt (position,
>> velocity, time) data. It is called RMC, The Recommended Minimum,
>> which will look similar to:
>>
>> $GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
>>
>> Where:
>> RMC Recommended Minimum sentence C
>> 123519 Fix taken at 12:35:19 UTC
>> A Status A=active or V=Void.
>> 4807.038,N Latitude 48 deg 07.038' N
>> 01131.000,E Longitude 11 deg 31.000' E
>> 022.4 Speed over the ground in knots
>> 084.4 Track angle in degrees True
>> 230394 Date - 23rd of March 1994
>> 003.1,W Magnetic Variation
>> *6A The checksum data, always begins with *
> If the third field is "V" instead of "A", you don't have a lock (but
> then the GPS LED on your tracker would be flashing instead of solid on.)
>
>> Another interesting thing, is that with smart beaconing turned on,
>> but in the absence of either a GPS signal or valid fix (I haven't
>> figured out which yet), the TT seems to fall back to the fixed auto
>> TX interval. So it sends out the status text at 1/5 of that rate,
>> rather than 1/5 of the applicable rate as determined by smart
>> beaconing. It seems that smart beaconing just didn't detect me
>> moving at all.
>
> I would expect that if it doesn't detect you moving that it wold
> beacon at the slow rate, whatever that happens to be. More than that I
> couldn't say :-)
>
> - Richard
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> Ozaprs at aprs.net.au
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