my problem with ..uno

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dlritter
Posts: 32
Joined: Fri Dec 04, 2015 7:12 pm

my problem with ..uno

Post by dlritter » Tue Oct 02, 2018 12:44 am

It does not filter out CTCSS tones from FM/NFM signals making it a bit annoying to monitor the local PD, SO and Fire dispatch ckts.
So SDR# to the rescue.. Filter Audio (ON)

OR am I missing something?

73 Dave N6DL

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NoelC
Posts: 137
Joined: Sun Nov 27, 2016 11:50 pm

Re: my problem with ..uno

Post by NoelC » Tue Oct 02, 2018 9:26 pm

Try the PDBPF button near the bottom of the EX CONTROL window.

-Noel

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g1hbe
Posts: 489
Joined: Sat Jan 17, 2015 3:28 pm
Location: Cheshire, UK

Re: my problem with ..uno

Post by g1hbe » Wed Oct 03, 2018 12:59 pm

It's buried on page 25 of the manual, just above section 7. It'd help if it was called 'audio filter'.

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Andy

dlritter
Posts: 32
Joined: Fri Dec 04, 2015 7:12 pm

Re: my problem with ..uno

Post by dlritter » Wed Oct 03, 2018 9:13 pm

found it, thank you.

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Mr. Lucid
Posts: 3
Joined: Tue Jun 18, 2019 5:19 pm

Re: my problem with ..uno

Post by Mr. Lucid » Wed Jul 17, 2019 7:13 pm

I was monitoring a net last night on our local repeater and noticed hum on the repeater audio. My initial suspicion was that I was hearing the 103.5hz "sub-audible" CTCSS tone that is emitted on the repeater output. Digging around online, I found my suspicion to be correct. There is a great YouTube video using PowerSDR demonstrating the presence of and subsequent filtering out of this tell-tale sound:
https://youtu.be/JzQVPKUyWjg

In PowerSDR this is controlled by the "TNF" function and in reading this thread I assume SDRUno's equivalent feature is the PDBPF button. I'll admit, I haven't tried it yet, but I will as soon as I get home.

In searching the SDRUno manual PDBPF is listed as the "Pure Data Band Pass Filter" and goes no further in detail. Having an inquisitive mind, I'm curious to know if someone could elaborate a bit more on the meaning and function of this button.

Thanks!

-Chris
Last edited by Mr. Lucid on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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Mike2459
Posts: 318
Joined: Mon Jul 24, 2017 8:24 pm

Re: my problem with ..uno

Post by Mike2459 » Thu Jul 18, 2019 1:41 am

From what I can tell by viewing the audio spectrum with PDBPF filter on and off. It acts as a low-pass filter with a cut off around 8 kHz

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mikeladd
Posts: 176
Joined: Wed Jul 08, 2015 3:18 am

Re: my problem with ..uno

Post by mikeladd » Fri Jul 19, 2019 9:42 pm

I believe the PDBPF is a band-pass filter with the cutoffs assigned via the LC (lowcut) and HC (highcut) values in the EX CONTROL panel.
https://imgur.com/a/4iGnFjS

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Mr. Lucid
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Joined: Tue Jun 18, 2019 5:19 pm

Re: my problem with ..uno

Post by Mr. Lucid » Sun Jul 21, 2019 12:46 am

Ah... Yes, it's a lot clearer now having played around with that setting. And it also makes sense to use this setting to eliminate CTCSS hum on your receive audio. "Pure Data" still seems an odd way of describing a band-pass filer assigned to audio range cut-offs. Thank you for your replies!

-Chris
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g1hbe
Posts: 489
Joined: Sat Jan 17, 2015 3:28 pm
Location: Cheshire, UK

Re: my problem with ..uno

Post by g1hbe » Sun Jul 21, 2019 7:31 am

It always used to be called the 'Post Detection Band Pass Filter', I can't recall when it changed. I leave it on all the time.

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Andy

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