Has anyone played with the TNC-Pi9K6 for decode of Fox birds
I'm interested in connecting a TNC-Pi9k6 https://tnc-x.com/TNCPi9k6.htm up to my IC-910 data port, and seeing if I can decode some FoxTelem data. Has anyone played with this, and if not, what TNCs are you using ? Thanks -Kevin (KK4YEL)
-----
The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence.
Hi Kevin,
If you just want to decode 9600 baud you can use a software TNC like the High Speed Sound Modem by UZ7HO. I have used that to decode Falconsat just fine with the UISS software. I think Patrick has an article on that exact setup.
For FoxTelem data I didn't need any sort of TNC, just the radio's audio stream feeding directly into FoxTelem. I have a video with just that. You can use the sound from it to test your own decode. Here's a link to it: https://www.youtube.com/watch?v=ob0BkiZQgFw&t=235s
The TNC Pi9k6 would be useful for transmitting though. It is much cheaper than any other 9600 TNC! I am curious myself if someone has tried to transmit with it using 9600 baud to satellites like Falconsat-3.
On Wed, Oct 3, 2018 at 10:28 PM, Kevin Zari kk4yel@gmail.com wrote:
I'm interested in connecting a TNC-Pi9k6 https://tnc-x.com/TNCPi9k6.htm up to my IC-910 data port, and seeing if I can decode some FoxTelem data. Has anyone played with this, and if not, what TNCs are you using ? Thanks -Kevin (KK4YEL)
The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence. _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
Kevin,
The data coming down from the current Fox sateliltes is not in AFSK/packet form, which I think is what the TNC board you are looking at does. It is data-under-voice, something invented by AMSAT. You can think of it as either a 200bps square (ish) wave modulated in with the audio (i.e. you filter out the audio above 300Hz or so and get a serial data stream) or else you can also think of it as FSK (carrier frequency shift keying) mixed in with the carrier frequency shift that the voice downlink causes.
So KG2C has the right idea: Use FoxTelem to decode the audio. I did not see Milen's video, so I don't know how he gets the audio out. The big problem is that most transceiver audio output filters out audio below 200Hz. This is sometimes true even of the data output from the transceiver and they almost NEVER tell you the low frequency spec. You have to get around that.
Good luck and 73, Burns WB1FJ AMSAT Flight Software
On Wed, Oct 3, 2018 at 10:28 PM, Kevin Zari kk4yel@gmail.com wrote:
I'm interested in connecting a TNC-Pi9k6 https://tnc-x.com/TNCPi9k6.htm up to my IC-910 data port, and seeing if I can decode some FoxTelem data. Has anyone played with this, and if not, what TNCs are you using ? Thanks -Kevin (KK4YEL)
The problem with the world is that the intelligent people are full of doubts, while the stupid ones are full of confidence. _______________________________________________ Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
participants (3)
-
Burns Fisher -
Kevin Zari -
Milen KG2C