Search found 12 matches

by xynium
Tue Mar 24, 2015 12:47 pm
Forum: RTL-SDR Discussion
Topic: schematic for the RTL-SDR dongle
Replies: 7
Views: 30137

Re: schematic for the RTL-SDR dongle

Thanks,
by xynium
Mon Mar 02, 2015 10:55 am
Forum: User Projects
Topic: AIS
Replies: 23
Views: 81884

Re: AIS

This week end, on "https://sites.google.com/site/f4eyuradio/ais-decoder" I have added a 4.4 version which include 2 checkbox, one choose AGC or manual gain, the other select or deselect AGC for R820.
by xynium
Thu Aug 21, 2014 3:37 pm
Forum: User Projects
Topic: AIS
Replies: 23
Views: 81884

Re: AIS

Hi,
I have received a R820 adapter and saw the problem.
So i build a new PnAis ver 4.1 that should work.
For this adapter the frequencies correction is 55ppm.

73 FM4PN

https://sites.google.com/site/f4eyuradio/ais-decoder
by xynium
Tue Jul 15, 2014 8:41 pm
Forum: User Projects
Topic: AIS
Replies: 23
Views: 81884

Re: AIS

tks for that info, so it should run on the R820 adapter.

This week end i will add a way to enter a frequency correction.

If one has a need for a frequency correction, this mean that the quartz is shifted. This mean the sampling rate is also shifted.

73 FM4PN
by xynium
Tue Jul 15, 2014 12:11 pm
Forum: User Projects
Topic: AIS
Replies: 23
Views: 81884

Re: AIS

I only have very sparse info on RTL2832. Pin 1/2 are for I input and 3/4 for Q. The E4K has I / Q output connected via 4 condensator to the RTL. R820 has only one output connected to 1/2 of the RTL. These info came from a schematic that explain how to modifie the adapter for a direct antenna connect...
by xynium
Sat Jul 12, 2014 5:50 pm
Forum: User Projects
Topic: AIS
Replies: 23
Views: 81884

Re: AIS

It seem R820T tuner doesn't output I/Q signal but only I phase.
If so PNAIS will not run.

73 FM4PN
by xynium
Fri Jul 11, 2014 2:07 pm
Forum: User Projects
Topic: AIS
Replies: 23
Views: 81884

Re: AIS

Normally small shift won't have significant effect. I use a sveon adapter the oscillator is precise enough for not being a problem. Demodulation is made by difference between sample and compared to a mobile mean. So it is robust to frequency shifting. Can u tell me about your key and the shift you c...
by xynium
Fri Jul 11, 2014 11:15 am
Forum: User Projects
Topic: AIS
Replies: 23
Views: 81884

Re: AIS

HI, It seem your antenna collect a too weak signal. At 9600bds the signal should be very strong. Having numerous error is normal. When a correct decoding occur it is displayed in the window. Some stations transmit only each 5 minutes, so counting on some error, the decoder should run 30minutes to ge...
by xynium
Thu Jul 10, 2014 2:57 pm
Forum: User Projects
Topic: AIS
Replies: 23
Views: 81884

Re: AIS

Ok, Just after launching and having press "Start" button, on the status bar should be display a number that quickly reach 100%. If not there is a major problem, strange if you can run sdr#. RTL2832 setting : sample rate is 240ksps, that is the minimun, for an economy of processor work. Gain is set t...
by xynium
Thu Jul 10, 2014 11:43 am
Forum: User Projects
Topic: AIS
Replies: 23
Views: 81884

Re: AIS

In the days to come, i will build a 100% english version. Once launched you will immediatly have on the status bar a counter in % -> it should show 100% whitch mean the output from the RTL2832 is fully treated in real time. If the computer is not fast enought it will show less than 100%. If you are ...