On Thu, Jan 31, 2019 at 08:05 PM, Dave Space wrote:
o my results with RSP1A are interesting transmitting at 7.150MHZ into a 40 db attenuator I was getting up to -55db on the RSP_SAS Spectrum analyzer at frequency 5 mhz up and down there were spurs at about -85db.? Higher than that I saw various spurs only to -95 or so.? I was seeing with the rtl-sdr? -30db spurs but I was also seeing near 0db at 21mhz and scope fft was showing something at 28MHZ even after swapping the relays. But I don't see anything at all that high in the 21mhz-28mhz range with the sdrplay.<<<<
If you say -85db with a 40 DB attenuator isn't that -45db when you correct for the attenuation???
When you add the required attenuation that becomes an offset to the scale.
The difference?? _45db is not terrible, -85DB competes with the best (and is unlikely).
Allison
