Using a passive antenna (VE3DO loop) with a Clifton Labs Z10042 11 dB Norton amplifier connected directly to Red Pitaya at N6TV, strong intermodulation from two nearby FM broadcast stations on 92.3 and 106.5 MHz was clearly visible (106.5 - 92.3 = 14.2 MHz):
Inserting the 14:1 transformer between the pre-amp and the Red Pitaya reduced the intermod significantly, and atmospheric band noise (wideband sensitivity) improved by about 4 dB:
It is only a matter of time before the production of our newbie STEMlab 250-12 will begin. The product has passed the system test last week and we are very pleased with the performance. Our engineers have already implemented all of the basic applications like oscilloscope, DSP, FFT spectral analyzer. The new STEMlab 250-12 with improved analog front-end performance will be available in December 2019 at a discounted price. We'll keep you updated, so stay tuned.