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Hello,
I'm currently working on a project(for academic purposes). I came to know about tinysa and would like to use the same for my project. The goal of the project is to automate the measurement of the peak value(power in dB) for each value of frequency. For example, a frequency of 868 MHz is set via the serial command to the spectrum analyzer and a continuous signal is passed with the help of an evaluation board to the spectrum analyzer (with different levels of Tx power, -12 to 10 dBm). Then, with the help of the corresponding serial command of the analyzer, the power value(peak) of the signal is to be measured.

I would like to know if TinySA will be the best fit for this scenario. If so, I also have a few more queries.
1. Will the accuracy drop for different levels of Tx power(-12 to 10dBm)?
2. Does the input step attenuator affect the accuracy?

Thanks and Regards
Sanjeev

On Mon, Dec 5, 2022 at 01:28 AM, Sanjeev wrote:

1. Will the accuracy drop for different levels of Tx power(-12 to 10dBm)?
2. Does the input step attenuator affect the accuracy?

At 868MHz you will need to use the high input for the tinySA which does not have a good input attenuator but only the step attenuator which is ill defined. You will have to calibrate the high input power reading anyway so it is best used with a fixed external attenuator.
The high input (with the use of an external fixed attenuator) is more than capable of accurately measure a 22dB power range
For best accuracy choose the external attenuator such that the input level at the high input is below -30dBm
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Thank you so much Erik!

On Mon, Dec 5, 2022 at 04:34 AM, Erik Kaashoek wrote:

For best accuracy choose the external attenuator such that the input level at the high input is below -30dBm

Perchance I simply missed it but, for the best accuracy, what would be the best input level for the lower input? ?With my new coming Ultra, what would be the best level?

As an aside: ?I don't know if 'for sales' are allowed but with my new Ultra coming, I will be selling my second tinySA. ?If any interest, please only send a private note!!! ?Thus after sale, I will have one Ultra and one tinySA.

Thank you Erik for your out outstanding work and truly amazing price, ? ? ? ? larry

On Wed, Dec 7, 2022 at 07:15 AM, Lawrance A. Schneider wrote:

for the best accuracy, what would be the best input level for the lower input? ?With my new coming Ultra, what would be the best level?

The input level does not impact level accuracy as long as you do not get the red markers signalling possible overload or the red "reduced level accuracy" warning.
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