MY QO100 SETUP
-
-
Hi Evariste,
First my compliments regarding your software !!!
Try to adjust RIT. It creates the 2nd constellation only +-2 KHz from the central frequency.
Keep me informed ...
-
Hi,
Some more notes: the +-2 KHz is for 500 KHz. Analogous for each bw. If you use the Pluto version may be there is interference from its own Tx. The Pluto version is still alpha version. Try 1st 500 KHz and then other speeds. 333 KHz seems not working (may be due that is really 333333). The time for constellation is analogous to the speed - bigger bw faster time to constellate.
-
-
Yes I have noticed that your reception was not flat as the Tx signal is.
-
Maybe my RF splitter has issue at 2.4Ghz...
Is it possible to provide the .grc to see blocks more clearly ?
-
Maybe my RF splitter has issue at 2.4Ghz...
Is it possible to provide the .grc to see blocks more clearly ?
For the moment I do not plan to give GRC. It is based on the examples provided with 3.7. My plans is to develop Python code and extend capabilities that GRC can not provide such as change at runtime ratio of sample rate or DVB T attributes.
-
Hi,
Some photos from SV8RV transmitting via DATV Express and Pluto for Rx.
-
Hello George,
This afternoon tony ik1hgi and me compiled the gr-iio succesfully for the pluto and did a test in transmitting and simultan receiving on xubuntu 18.04
it works , but signal was going up and down....
don't know what bitrate and video should be used for 500 dvbt
attached images tx and rx ....
73 nico and tony ik1hgi
on the left rx in vlc image on the right obs as video/audio source in.software behind running as transceiver
-
Thanks to George SV1BDS for the new dvb-t tool. Never imagined that with an rtl stick i could decode my dvb-t tx-2k.
73 de SV8RV
-
ON7NDR , ik1hgi Tony the rate for 500 KHz must be also 500. I hope soon to make a simplex QSO DVB-T between Greece and Italy.
-
Tonight at 22.00 I asked if I could transmit the DVB-T mode SR500 SV8RV quickly receive the signal SR500 great result received
73 ik1hgi Tony
-
-
Hi,
Local DVB-T 64QAM Tx at UHF using only 25 KHz BW at 75 k using GNURADIO.
Important is that separate Tx (Pluto GPSDO)and Rx(RTL TCXO) units are used.
The required SNR is 30 dB (about S5). This mode permits to use video from 29 MHz and above.
The required accuracy is about 200 Hz.
-
Hi,
The Rx code.
-
Hi,
The version 6 of DVB-T Rx code. Now fixed sample rate 2M. Use with ratio 4 or bigger (4 for 500 KHz bw = default). RIT is immediate changing now. Spectrum is display now only after BPF. The hidden feature is that avoid receiving at center of spectrum (DC problem) that pilot tones exists. Expected performance improvement. F5OEO if anything can be done to help you improving your code please notify.
-
Yesterday with the company of my friend Nico ON7NDR after a long time I stopped on the Hard Disk the program Xubuntu Linux, we are testing Version 6 of the DVB-T RX code, doing tests I transmit from Windows the signal of DVB-T ST500, using it as the program receives DVB_T_RX_2k5 from Linux, with other programming modes Xubunti, here is the link https://forum.amsat-dl.org/index.php?...
Informational title for use and experience the DVB-T system would like a RAM memory then at least 16 Gigs, I have only 4 only test was positive, excellent result the thing that struck me with a normal RTL-SDR Dongle, I receive the signal first tests OK....
73 IK1HGI Tony -
Hi,
The HP8720C network analyser display this error and reboot when I enter full calibration menu. Any ideas? I have operation and service manual. Any one have calibration or hardware manual?
-
Hi,
A word around has be found. I increase the sweep time to 1 sec and the fatal error does not occur.
-
Hi,
Just another Pluto in a shielded box.