Comments (17)
commented on September 25, 2024
2
Hello,
I'm surprised that this can work because you are using the native sampling
rate which does not push the image frequencies far enough into the
stop-band of the 1.75 MHz monolithic filter inside the transceiver chip.
Trust me - it looked truly awful on a spectrum analyser!.;-D
If you have sufficient cpu resources, try to operate odr-dabmod and
hackrf_transfer at a higher sampling rate, ideally at least 4.096M. It will
clean up your signal a lot and the image won't be there to clobber
reception. Disable the FIR filter if you have too because it would still
much better than the close-in image interference.
Hope this is useful!
R.
…On 16 May 2018 at 19:15, andimik ***@***.***> wrote:
btw: My ini is:
[input]
transport=file
source=/dev/stdin
loop=1
[modulator]
gainmode =1
rate=2048000
digital_gain=0.8
[output]
output=file
[fileoutput]
format=s8
filename=/dev/stdout
[tii]
enable=1
comb=4
pattern=11
old_variant=0
more foo.eti | odr-dabmod foo.ini | hackrf_transfer -t - -f 215072000 -x
25 -a 1 -s 2048000 -b 1750000
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mpbraendli
commented on September 25, 2024
What version did you use?
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andimik
commented on September 25, 2024
The latest from the next. I've posted the version in the (closed) issue about edi.
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andimik
commented on September 25, 2024
ODR-DabMod version v2.0.0-26-g9ef3824, compiled at May 13 2018
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andimik
commented on September 25, 2024
Digital gain is 0.8
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mpbraendli
commented on September 25, 2024
Ok. I also used next to do a test, enabling/disabling TII with the remote-control. I wasn't able to see any effect on my receivers :-/
Can you post your .ini file in a github gist or on https://paste.ubuntu.com/ and send me a link?
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andimik
commented on September 25, 2024
Well, now I remember. When I started the issue I still had Ubuntu 16.04. Some days ago I re-installed a clean 18.04 Kubuntu. And tested it again right now. Seems we can close now.
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andimik
commented on September 25, 2024
btw: My ini is:
[input]
transport=file
source=/dev/stdin
loop=1
[modulator]
gainmode =1
rate=2048000
digital_gain=0.8
[output]
output=file
[fileoutput]
format=s8
filename=/dev/stdout
[tii]
enable=1
comb=4
pattern=11
old_variant=0
more foo.eti | odr-dabmod foo.ini | hackrf_transfer -t - -f 215072000 -x 25 -a 1 -s 2048000 -b 1750000
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andimik
commented on September 25, 2024
Ok thanks, I'll try that instead.
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mpbraendli
commented on September 25, 2024
If you read from a file, better specify the filename in the .ini over using more. cat would be more appropriate (pun not intended) because more is a pager, it could actually mess with file contents.
Thanks for reporting issues, even if this was (luckily) a false positive!
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andimik
commented on September 25, 2024
Ok, thanks.
I also had to change rate=2048000 in the ini-file to 4096k.
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andimik
commented on September 25, 2024
Well, I don't see a difference between 4M and 2M beside of higher traffic and CPU usage. Signal is the same. Both work here.
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mpbraendli
commented on September 25, 2024
How do you measure your signal? Do you have a spectrum analyser?
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andimik
commented on September 25, 2024
Qt-dab
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mpbraendli
commented on September 25, 2024
qt-dab doesn't show a wide enough bandwidth, so you won't see the effect Rash is talking about.
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andimik
commented on September 25, 2024
4096k and CPU usage 40%
2048k and CPU usage 35%
For testing (and helping FMSCAN to be updated with CSV files from Andreas Gsinn's Player) this is absolutely ok.
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mpbraendli
commented on September 25, 2024
Sure. It's interesting to see that the spectrum looks a bit flatter in 4096ksps. Maybe it's just an impression though.
As long as you are aware of the limitations and consequences of using 2048ksps, this is fine.
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