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Re: DX PATROL MK4.
Thanks for the reply. I had an issue with the PPM setting that needed adjustment. I also need to find a solution for the high gain. I added a blacklist entry that frees up the receiver, decoupling it from the DVB-T receiver.
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Re: DX PATROL MK4.
Geia sou Giorgo,
It looks like you need to blacklist some modules.
First create the following file (copy past from sudo all the way to last EOF)
sudo tee /etc/modprobe.d/exclusions-rtl2832.conf <<EOF
# Blacklist host from loading modules for RTL-SDRs to ensure they
# are left available for the Docker guest.
blacklist dvb_core
blacklist dvb_usb_rtl2832u
blacklist dvb_usb_rtl28xxu
blacklist dvb_usb_v2
blacklist r820t
blacklist rtl2830
blacklist rtl2832
blacklist rtl2832_sdr
blacklist rtl2838
install dvb_core /bin/false
install dvb_usb_rtl2832u /bin/false
install dvb_usb_rtl28xxu /bin/false
install dvb_usb_v2 /bin/false
install r820t /bin/false
install rtl2830 /bin/false
install rtl2832 /bin/false
install rtl2832_sdr /bin/false
install rtl2838 /bin/false
EOF
Then do also the following
install dvb_usb_rtl2832u /bin/false
install dvb_usb_rtl28xxu /bin/false
install dvb_usb_v2 /bin/false
install r820t /bin/false
install rtl2830 /bin/false
install rtl2832 /bin/false
install rtl2832_sdr /bin/false
install rtl2838 /bin/false
EOF
Then do also the following
sudo modprobe -r dvb_core
sudo modprobe -r dvb_usb_rtl2832u
sudo modprobe -r dvb_usb_rtl28xxu
sudo modprobe -r dvb_usb_v2
sudo modprobe -r r820t
sudo modprobe -r rtl2830
sudo modprobe -r rtl2832
sudo modprobe -r rtl2832_sdr
sudo modprobe -r rtl2838
then..
sudo depmod -a
After that I would reboot the raspi and hopefully all will be ok.
-Yiannis
sudo modprobe -r dvb_usb_rtl2832u
sudo modprobe -r dvb_usb_rtl28xxu
sudo modprobe -r dvb_usb_v2
sudo modprobe -r r820t
sudo modprobe -r rtl2830
sudo modprobe -r rtl2832
sudo modprobe -r rtl2832_sdr
sudo modprobe -r rtl2838
then..
sudo depmod -a
After that I would reboot the raspi and hopefully all will be ok.
-Yiannis
Re: DX PATROL MK4.
Do you mean OpenWebRX+ 1.2.117 SD Card Image for 64bit Raspberry Pi ?
RasPi 3 probably doesn't have enough processing power, and although it has 64-bit ARM core with a 32-bit GPU, the usual RasPi OS is only 32-bit.
I'd suggest minimum RasPi 4 (or even better a 5) hardware, to be able to take full advantage of OWR+.
On Tue, Aug 4, 2026 at 05:26 AM, GEORGE-SV1GGY wrote:
DX PATROL MK4.
Good evening to the group. I have an RPi 3B and installed OpenWebRx from the official site (dated 11/10/2023), and it works very well. However, when I installed OpenWebRx version 1.2.117 from LZ2SSL, I get no VHF/UHF/HF reception at all. In the first instance, the system recognizes the SDR as an RTL-SDR, whereas in the second, it recognizes it as a DVB TV receiver. Does anyone have any idea what I should do? The waterfall display is blue, but there is no signal reception. All settings seem to work, yet there is no reception. Thanks in advance.
