Compatiblity DVB-T2 1.7MHz
Re: Compatiblity DVB-T2 1.7MHz
I forget, the signal is 20dB over noise.
Re: Compatiblity DVB-T2 1.7MHz
Dave,
Have you tried it with the 8K mode?
I found the transmitted signal had to be much more 'accurate' with 8K than with 2K on a Knucker.
The Paris repeater appears to be using 8K 64QAM.
- Charles
Have you tried it with the 8K mode?
I found the transmitted signal had to be much more 'accurate' with 8K than with 2K on a Knucker.
The Paris repeater appears to be using 8K 64QAM.
- Charles
Re: Compatiblity DVB-T2 1.7MHz
Hi Charles
I have not tried 8K 1.7 MHz DVB-T (no means to generate it), only 2K. I know that 8K 8MHz DVB-T2 from a broadcast MUX does work (but challenges the RPi 4 to play smoothly).
Patrice - have you tried slight frequency adjustments either side of the nominal frequency?
Dave
I have not tried 8K 1.7 MHz DVB-T (no means to generate it), only 2K. I know that 8K 8MHz DVB-T2 from a broadcast MUX does work (but challenges the RPi 4 to play smoothly).
Patrice - have you tried slight frequency adjustments either side of the nominal frequency?
Dave
Re: Compatiblity DVB-T2 1.7MHz
With off-air signals it is extremely important to have a good band pass filter for 70cms in place or the tuner will see all sorts of other signals that may upset it. I know it is designed for TV use but the TV channels are specifically arranged to minimise the images etc. On 70cms not so.
Mike
Mike
Re: Compatiblity DVB-T2 1.7MHz
Hello,
Got mine working at 1.7M bandwith now
Receiver : Knucker (just built)
Transmitter : Portsdown 4 + Lime (FFT 2K / QPSK / FEC 5/6 / Gard 1/32)
Remark : replaced the Lime by Pluto and did not work (Too much BW for Pluto or wrong F5OEO FW ? - was Beta For the Brave)
73 - Christian
F1FAQ
Got mine working at 1.7M bandwith now
Receiver : Knucker (just built)
Transmitter : Portsdown 4 + Lime (FFT 2K / QPSK / FEC 5/6 / Gard 1/32)
Remark : replaced the Lime by Pluto and did not work (Too much BW for Pluto or wrong F5OEO FW ? - was Beta For the Brave)
73 - Christian
F1FAQ
Re: Compatiblity DVB-T2 1.7MHz
Hi Dave, Hi Charles,
I tried to scanne frequency from 438.200 to 438.700 MHz but nothing.
I tried 2K instead 8K nothing,
I switch the repeater 1.7 to 5MHz and...it worked.
73's Patrice
I tried to scanne frequency from 438.200 to 438.700 MHz but nothing.
I tried 2K instead 8K nothing,
I switch the repeater 1.7 to 5MHz and...it worked.
73's Patrice
Re: Compatiblity DVB-T2 1.7MHz
Hello Patrice,
It sounds like you must still have the wrong version of the code installed.
I know Dave has already instructed you on how to upgrade it but in the first version there was a mistake in a table
that programs the internal clocking in the NIM (the mistake was only for the 1.7 MHz entry).
Basically the only change to get different bandwidths is that one table so if it works at very low bandwidths it should also
work at 1.7 MHz (unless the table entry is wrong)
- Charles
It sounds like you must still have the wrong version of the code installed.
I know Dave has already instructed you on how to upgrade it but in the first version there was a mistake in a table
that programs the internal clocking in the NIM (the mistake was only for the 1.7 MHz entry).
Basically the only change to get different bandwidths is that one table so if it works at very low bandwidths it should also
work at 1.7 MHz (unless the table entry is wrong)
- Charles
Re: Compatiblity DVB-T2 1.7MHz
Hi Charles,
Could you confirm the code as follow is correct ?
cp /home/pi/ryde-build/configs/dvbt/CombiTunerExpress /home/pi/dvbt/CombiTunerExpress
Patrice
Could you confirm the code as follow is correct ?
cp /home/pi/ryde-build/configs/dvbt/CombiTunerExpress /home/pi/dvbt/CombiTunerExpress
Patrice
Re: Compatiblity DVB-T2 1.7MHz
Hi Patrice
I'll get back to you later today with some tests to check that you have the correct version for 1.7 MHz.
Dave
I'll get back to you later today with some tests to check that you have the correct version for 1.7 MHz.
Dave
Re: Compatiblity DVB-T2 1.7MHz
Sorry Patrice I can't as I am not using Ryde software with mine.
I just have the manufacturer's SDK which I run on a regular Linux x86 PC.
- Charles
I just have the manufacturer's SDK which I run on a regular Linux x86 PC.
- Charles