Re: [Hamlib-developer] Text representation of the waterfall?

[Black M. <mdb...@ya...>]

There are very few rigs that provide audio over the USB interface.

What could be done is standalone program that watches the audio stream and tries to detect signals being present.

I'm planning on creating a utility that would automagically adjust the audio level and/or rig level and/or rf gain to help keep audio levels at optimum levels.
I could probably add some sort of signal detector to that too but it would have to be generic and just looking for SNR thresholds across the audio passband.

Mike W9MDB








On Saturday, October 29, 2022 at 03:18:45 AM CDT, Philip Rose - GM3ZZA via Hamlib-developer <ham...@li...> wrote: 






Hi Georgina,
 
As far as I am aware, hamlib does not perform any signal analysis. The S meter report is simply what the rig measures, which is based on the overall signal level within its passband.
 
If you can reduce the filter width to the minimum provided by the rig and then somehow step the filter centre frequency and read the S-meter at that frequency. However this is likely still to be the instantaneous S-meter reading.
 
To get the average I think you are asking for would need to do this at each frequency you sample at, or maybe read at each frequency as fast as you can and cycle through them several times to get an average over the overall period. I don’t know how long each access would take.
 
I hope that gives you some idea how to solve this problem. 
 
73 Phil GM3ZZA
 
Sent from Mail for Windows
 
From: Georgina Joyce
Sent: 25 October 2022 00:06
To: ham...@li...
Subject: [Hamlib-developer] Text representation of the waterfall?
 
Hello,
 
In short I am asking how I ask hamlib for the S reading. Preferably over a short period of time i.e. listen for a couple of seconds and report the strongest signal's strength. A snapshot of a chosen section  of any band.
 
I wondered if I could find strong signals on a span of frequencies? Which would provide a list for frequencies that are stronger than S7? Providing the noise level isn't 7.
 
Is there a way of asking hamlib for the S reading? I understand it will vary from radio to radio but you may recall I am working with the FT-991A and the FT-818.
 
I am thinking of using awhile loop. Inside an if statement incrementing the frequency and calling rigctl to set the incremented frequency and then asking for the S reading. Is that possible with these 2 radios?
 
The desired output would be a list of S reading then the frequency. Just in a terminal window or pager. It would be easy to use a screen reader reading up the screen. This would give an overview, then a similar version that paused and asked the user if they wanted to stop at the current frequency (y - N)?
 
Any suggestions would be helpful in S readings and strategies of identifying QSo's.
 
Regards,
 
Georgina
 
 
Call: M0EBP
DMR ID: 2346259
Allstar: 52178
Locater: IO83PS
 
 
 
 
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