Hi,
Got a strange problem with the DSA815 and would like to see if anyone else is observing it.
Bought it recently about 6 months ago.
When using the DSA815-TG to get a spectrum output from a HF transmitter, seen a strange spurious signal in the area of 14.3 MHz.
Specifically, when a signal is fed to the instrument, in the area around 14.3 MHz eg 14.25 MHz or 14.35 MHz, appart from the original signal there is also displayed another signal (mixing product?), for that see attached images 501/2/3/5/6/7. When feeding the instrument with a signal at exactly 14.3 MHz, then the observed phase noise gets beyond the instrument's advertized limits, for that see the attached image 504.png
To verify the problem, I replaced the HF transmitter with a lab signal generator, the DG1022Z.
Seen the exact problem again.
The screenshots attached are from that setup, DG1022Z transmitting into DSA815-TG and the problem is still there so it was not the HF transmitter.
Has anyone else seen this or is it just my unit?.
Version of Main Board:00.09
Version of Radio Frequency Board FPGA:00.05
Version of Digital Board FPGA:00.05
Version of Firmware:00.01.18
Version of Boot:00.01.04
And btw, how can I submit a ticket to Rigol?
Thanks,
Christos