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[aprssig] Suggestions for TNC

Scott Miller scott at opentrac.org
Tue Nov 15 03:56:58 UTC 2011


On 11/14/2011 1:44 AM, Rob wrote:
> On 14/11/11 06:19, Andrew Rich wrote:
>> I have gone back to just a receiver on 145.175 MHz ( Australian freq )
>> I am now looking for a device to decode APRS.
>>
> I hear the OpenTracker USB does a good job for $USD40

Just make sure you've got the audio level dialed in right.  It has 3 
different input gain settings to make it easier, but it's working an 
8-bit processor pretty hard to do the demodulation and it has limited 
dynamic range.

With that done, it works quite well.  I just got some samples of some 
cool little 1-watt transceiver modules, and the audio level came out 
perfect without any tweaking - decode performance in the (fairly short) 
test I did was on par with the MX614-based Tracker2.

The Tracker3 uses a 32-bit processor and isn't as picky about the input 
level.

Scott
N1VG



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