[OZAPRS] ISS Packet system down....
vk4tec at tech-software.net
Tue Aug 1 13:15:43 AEST 2017
You can marry up gpredict and gqrx and an rtl sdr dongle to get Doppler shifted Linux based ground station
Sent from my iPhone
> On 1 Aug 2017, at 1:11 pm, vk2tv <vk2tv at exemail.com.au> wrote:
> Yes, and I've dabbled with it, but I had the old hardware gathering dust. My USB sound device doesn't play well with the Pi and it's not worth (for me) buying more USB sound devices.
> I've not compared myself but I've read that the Exar 2211 FSK decoder in the original TNC2 decodes better than the TCM3105 chip in the Tiny 2. I ran a number of Baycom (serial port) style modems using the TCM3105 for a while and they were a bit ordinary. However, my Baycom USCC>4 card also uses the TCM3105 ( in a very similar circuit to the humble Baycom modem) and it walked all over the serial port Baycom style modems. I think the vastly improved timing of the USCC card was responsible for the outstanding performance improvement. When my shack is set up again I'm going to compare the USCC card performance with Direwolf. It's one comparison the author of Direwolf hasn't published. Watch this space.
> Ray vk2tv
>> On 01/08/17 12:53, Andrew Rich wrote:
>> Have you seen that direwolf decodes way more packets than an average tnc
>> Sent from my iPhone
>>>> On 1 Aug 2017, at 12:50 pm, vk2tv <vk2tv at exemail.com.au> wrote:
>>>> On 01/08/17 12:17, Liz wrote:
>>>> you say you just have windowsXP. For a very small price a RTL-SDR
>>>> receiver, a suitable antenna and a current microcomputer (eg RPi) would
>>>> build you a complete iGate which won't cost much to run, and need an
>>>> occasional restart.
>>>> Just another experiment....
>>>> I'm currently using a RTL-SDR and a Pine64 to watch the ADS-B traffic,
>>>> with a collinear antenna built from scrap coax. That's another fun
>>> I agree, but why the occasional reboot?
>>> My RPi with RTL dongle for ADS-B currently has an uptime of 125 days, and has been sending data to PlaneFinder for 70 days. Give the RPi a decent power supply and it will run for forever!
>>> My previous (and soon to be again) APRS satgate used a Pi driving a four-port FTDI USB/RS232 adaptor to drive an old TNC (Tiny 2) and the old Icom IC-2 handheld for 145.825. That arrangement ran for months without a reboot, and gave the old Icom a new purpose in life.
>>> Ray vk2tv
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>>> OZAPRS at aprs.net.au
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