DVB-T with Portsdown 4

[dl5eu]

Hello all,

I have set up a Portsdown 4 (4 GB RPi) with the latest development version of the software (202101310) and an ADALM PLUTO with the firmware of Evaristo.

At the moment I have only a HiDes DVB-T receiver available here (seems to be a HV-122DCA) with a monitor connected to the HDMI output. I thought that it should be possible to receive a signal from the Portsdown in the 70cm-band with 1 MHz bandwidth. The signal parameters are correctly recognised by the RX (FEC, guard interval, video PID, audio PID and so on), the signal is locked (green LED on the RX) but the picture on the screen is unrecognisable and totally distorted, with strange colours that change about every second. No matter if I use the camera of the RPi or the test card as video source.

Does anybody have an idea what's going wrong here? An HDMI problem? When I use the HiDes TX reception is ok. I am eagerly awaiting the arrival of Knucker

Thank you very much for your help!

Kind regards,

Ralf, DL5EU

[DD1IA_Hans-Peter]

Hi,
did you manage the problem until now ?
I use Pluto & HV-122A with DATV Express or Portsdown4 and 1MHz BW. Its nessesary to use Firmware 6.72.xxx not 6.79.xxx !
6.72.xxx = Pluto, etc. 6.79.xxx = HIDES TX with low latency.

Have fun with HAM-R, 73 Hans-Peter DD1IA