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Analog detector output in Zero span mode #feature_request

 

Any chance to have a analog output representing RSSI level in Zero span mode?
And/or level at cursor point on analog output.
Like a RF-detector, just much better since Rx bandwidth can be set and much high sensitivty than typical diode-RF-detectors.
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The LISTEN mode should do exactly what you request
Doing the output in zero span mode will create gaps in the output
--
Designer of the tinySA
For more info go to

 

Great, and thanks a lot for fast reply :-)
Will order ZS-407 on Monday...
 

Just received my ZS-407 - a very nice little instrument :-)
Seems like listening signal on 3,5mm jack is AC ??coupled?
Is it possible to change it to DC coupling, so that a constant RF level gives a constant DC voltage on the jack?
 

Shorten C85 close to the audio connector
Or use the pin header pin marked PA4 for for 0-3 V output
--
Designer of the tinySA
For more info go to

 

Hi Erik
Thanks for reply regarding C85 - done :-)
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However, it does not work as expected :-(
There is a lot of noise and in some cases it seems like that an AGC increases the sensitivity when there is no signal.
Have made a test setup where the signal is generated by a signal generator with a 100% AM modulation.
The signal strength at tinaSA is approx. -46dBm
In parallel with tinaSA I have a simple diode detector.
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First test: Screen dump from tinaSA in Zero-span mode.
Here it is clearly seen that the signal changes between approx. -48dBm and < less than -100 dBm - as expected
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Second test - attached file: tinySA-ListenMode-50HzAM.pdf
Lots of noise on blue line (Listen signal from tinySA)
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Third test: - attached file: tinySA-ListenMode-1HzAM
Even more noise on blue line (Listen signal from tinySA)
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Have tried different settings of REF LEVEL, but it does not affect the signal on the Jack connector in Listen mode.
How to get more clean signal on Jack connector in Listen mode?
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Thanks in advance, Knud


tinySA-ZeroSpan-50Hz-AMmodulation.png
tinySA-ListenMode-50HzAM.pdf
tinySA-ListenMode-50HzAM.pdf
tinySA-ListenMode-1HzAM.pdf
tinySA-ListenMode-1HzAM.pdf

 

There is indeed an AGC active in the firmware
This can easily be removed, or even be changed to user settable.
--
Designer of the tinySA
For more info go to

 

Many thanks for the quick reply - I am impressed!
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It will be more very valuable for me if AGC in Listing mode is disabled.
Want to use tinySA in connection with developing firmware for wireless radio systems.?
Here, it is very useful to have a good RF detector that shows whether a certain frequency is being transmitted.
I can hereby see when a tramsnitter is active together with e.g. SPI communication with radio chip.
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When can I expect a firmware update for tinySA with disabled or option to disable AGC in Listen mode?

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