<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>You can marry up gpredict and gqrx and an rtl sdr dongle to get Doppler shifted Linux based ground station </div><div id="AppleMailSignature"><br></div><div id="AppleMailSignature">A <br><br>Sent from my iPhone</div><div><br>On 1 Aug 2017, at 1:11 pm, vk2tv <<a href="mailto:vk2tv@exemail.com.au">vk2tv@exemail.com.au</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<p><font face="Times New Roman, Times, serif">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.</font></p>
<p><font face="Times New Roman, Times, serif">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.</font></p>
<p><font face="Times New Roman, Times, serif">Ray vk2tv<br>
</font></p>
<p><font face="Times New Roman, Times, serif"> <br>
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<div class="moz-cite-prefix">On 01/08/17 12:53, Andrew Rich wrote:<br>
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<blockquote type="cite" cite="mid:0EC3AA02-B0A1-4B62-9087-954D6F1ABA6D@tech-software.net">
<pre wrap="">Have you seen that direwolf decodes way more packets than an average tnc
A
Sent from my iPhone
</pre>
<blockquote type="cite">
<pre wrap="">On 1 Aug 2017, at 12:50 pm, vk2tv <a class="moz-txt-link-rfc2396E" href="mailto:vk2tv@exemail.com.au"><vk2tv@exemail.com.au></a> wrote:
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<pre wrap="">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
experiment.
-+-+-+-+-+-+-+-+-+-+-+
Liz
VK2XSE
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<pre wrap="">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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