OpenWebRX configuration problem

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BG9EGA
Posts: 3
Joined: Fri Sep 04, 2020 2:33 am

OpenWebRX configuration problem

Post by BG9EGA » Fri Sep 04, 2020 3:33 am

I am using OpenWebRX Docker to build an RTL-SDR receiving station.
https://hub.docker.com/r/jketterl/openwebrx
But there was some trouble in the configuration.
The following is a paragraph from the configuration file:
"HAM 80m": {
"name": "HAM 80m",
"center_freq": 3650000,
"start_freq": 3573000,
"samp_rate": 240000,
},
The maximum samp_rate of RTL-SDR is 2400000. The display is too wide for the 80m HAM band().
I try to set an intermediate value. Tried a lot: 360000 480000 512000......
But it will cause OpenwebRX to start reporting an error. Unable to find RTL-SDR device.
The current working "samp_rate" is 240000 and 2400000.
How can I solve this problem?

tim_rtd
Posts: 162
Joined: Fri Jun 30, 2017 11:34 am

Re: OpenWebRX configuration problem

Post by tim_rtd » Sun Sep 06, 2020 6:41 pm

I'm using 1024000 for the hf bands with no issues.

BG9EGA
Posts: 3
Joined: Fri Sep 04, 2020 2:33 am

Re: OpenWebRX configuration problem

Post by BG9EGA » Mon Sep 07, 2020 2:06 am

Thanks for your reply.
1024000 works fine.
Before there is no other suitable value, I will use 1024000.
It would be great if there are more values to choose from.

BG9EGA
Posts: 3
Joined: Fri Sep 04, 2020 2:33 am

Re: OpenWebRX configuration problem

Post by BG9EGA » Fri Sep 11, 2020 2:09 am

I found a way.

Use command:
# SoapySDRUtil --probe="driver=rtlsdr"

Output result:
Full gain range: [0, 49.6] dB
TUNER gain range: [0, 49.6] dB
Full freq range: [23.999, 1764] MHz
RF freq range: [24, 1764] MHz
CORR freq range: [-0.001, 0.001] MHz
Sample rates: 0.25, 1.024, 1.536, 1.792, 1.92, 2.048, 2.16, 2.56, 2.88, 3.2 MSps

It seems that the smaller values are only 240000 and 1024000.

But here comes a new problem:
RF freq range: [24, 1764] MHz

Why not 100 KHz-1.7GHz?
My RTL-SDR consists of two interfaces: 100KHz-30MHz and 30MHz-1.7GHz
How to use 100KHz-30MHz interface in this case?
Is it the linux driver?

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