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Unable to get Listen to work on Ultra

 

No matter what headphone I try the audio output remains silent. I have tried partial insertion, everything to no avail. I have a marker on the center of a local FM station. Is there something I am missing here?

Also I noticed that often the sweep stops when I check the listen box but restarting the sweep makes no difference. I can set the span to 0 and see the audio so I know that is working with plenty of amplitude.

This is a brand new unit I bought directly from the official store so I know it in not a clone. I received it a few days ago,

Thanks for you help.

Sam
W3OHM
 

Sam,

The Listen function works only for AM modulation signals not for FM.

Regards

Fernando
CX8JD

El dom, 11 de dic. de 2022 12:29, Sam Reaves <sam.reaves@...> escribi¨®:
No matter what headphone I try the audio output remains silent. I have tried partial insertion, everything to no avail. I have a marker on the center of a local FM station. Is there something I am missing here?

Also I noticed that often the sweep stops when I check the listen box but restarting the sweep makes no difference. I can set the span to 0 and see the audio so I know that is working with plenty of amplitude.

This is a brand new unit I bought directly from the official store so I know it in not a clone. I received it a few days ago,

Thanks for you help.

Sam
W3OHM

 
Edited

On Sun, Dec 11, 2022 at 07:29 AM, Sam Reaves wrote:
I have a marker on the center of a local FM station. Is there something I am missing here
As stated in the wiki the tinySA can only do AM detection, to hear FM stations you need to use "slope" detection.
This is what I do to listen to the FM broadcast band.
Attach telescopic antenna
Plug in sensitive headphone
Set start to 85MHz
Set stop to 105MHz
Enable LNA
See all the FM stations appear

?Set RBW to 100kHz
Enable LEVEL/LISTEN
Grab the marker and move on the side of the FM signal (as shown above)
Now you may hear the FM station
For sure you will hear noise
--
For more info on the tinySA go to https://tinysa.org/wiki/
 

For narrow FM band you can set RBW to 30 kHz.
 

Note that if you load another preset, although the "listen" option is still shown as enabled, it doesn't appear to be. I had to toggle it off and then back on again for it to work.
 

On Mon, Dec 12, 2022 at 06:32 AM, <aleatorii.yg@...> wrote:
I had to toggle it off and then back on again for it to work.
Thanks for reporting
?
--
For more info on the tinySA go to https://tinysa.org/wiki/
 

RBW set to 100kHz and FM sounds great. 30 was not good.
Hugo Coolens
 

Detecting FM stations with a RBW set to 100kHz and the LNA on worked for me, not exactly HiFi-reception but OK. I had to fiddle a bit with the 3.5mm jack of my headphone to get sound. Is it possible to adjust the volume?
 

On Sun, Feb 5, 2023 at 07:55 AM, Hugo Coolens wrote:
Is it possible to adjust the volume?
No. There is an AGC on the audio trying to get the maximum audio out.
Choose sensitive headphones?
?
--
For more info on the tinySA go to https://tinysa.org/wiki/
 

Hi ,

I use some old cellphone earphones , works perfect.

Regards

Patrick

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