SDRplay Community Forum

The spec says the AM broadcast MW Notch Filter >30dB is designed for 680-1550 kHz. According to the block diagram the Notch Filter is only valid for antenna port A and B. However port A and B are specified for 1500 kHz - 2 GHz. The Hi Z port which does not have the Notch Filter is specified for 1 kHz - 30MHz. I do not understand this. Please explain. At a U-tube presentation of the RSP2 there is said that the performance is decreased below
1500 kHz for port A and B so it will not meet spec. What specific performance is decreased below 1500 kHz for these ports?
What do I gain and what do I miss when I use the Hi Z port?
I am interested to buy a RSP2 and my main interest is AM broadcasts in the MW and SW bands.

The AM notch is designed to stop images from the AM(MW) band popping up in higher bands like SW and VHF. You would use antennas A or B for listening on VHF, so that's where the notch filter is fitted. You wouldn't want to notch the AM band when listening to the AM band via the Hi-z port.
I find the spectrum from VLF to 30 MHz is better (lower noise and fewer images) via the Hi-z port. This port rolls off above 30 MHz, so VHF/UHF is handled via ports A and B.

Thanks for the comments. I did missunderstand the function of AM notch. I am used to trimming my notch while listening to broadcasts on USB and manage to get rid of disturbing tones for instance. This may be handled by the software SDRUno if I understand correct.