Was anyone able to add the 1Hz on the new 1.2.9.2a firmware?
I am on 1.2.9.1 and don't get a valid measurement at 1Hz RBW either.
I am also on 1.2.9.1 but at 1Hz RBW the unit is very very slow and the noise floor becomes a flat line
and the measurement is not reliable either. Even before the hack when it did have the official promotional licence for a while (before it expired)
the 1Hz RBW was the same, useless. Even the 3Hz is not working properly. Basically I can only use >=10Hz so you are not missing anything!
Slow, yes it is. Here can find math.
https://www.siglenteu.com/application-note/spectrum-analyzer-basics-bandwidth/Also if it helps there is available HP/Agilent/Keysight AN-150 for further readings.
http://literature.cdn.keysight.com/litweb/pdf/5952-0292.pdfIt is true that specially 1Hz RBW in Siglent this model have some limits and these are not specified. Originally there was not at all 1Hz and 3Hz RBW. Some time later they give these free to all users for use. But there is some things based to hardware. (Imho, there are not enough "bits" in ADC and perhaps ADC autoranging have some limiting factors in HW??. I suspect it have something to do with this. So, it can not "pull up" if there is not enough signal level. Some tiny possible indirect tip in Keysight AN-150 page 38 figure 3-3 )
Is it useless... no it is not. But user need understand some limits.
Here tiny examples SSA3021X (mod32X). Yes and FW is 1.2.9.2a
Who can say it is useless when look these images. Carrier 118.7MHz, -30dBm, AM mod with 20Hz sine and modulation depth 2% (LSB and USB -40dBc)
1Hz RBW and for compare same with 10Hz RBW
(span 600Hz (2x minimum block, it is hopping 300Hz blocks in this case))
RBW10Hz
RBW 1Hz
Useless, really?