8600 Low Latency for Digital mode and Bandwidth

What I hear in your video is definitely NOT an RTTY signal. There appear to be several FT4 or FT8 signals in the passband and that is what I hear. They sound nothing like RTTY. Did you think to turn the dial so that the RTTY signal just out of your passband moved into the passband and was audible?

73, Craig, KØCF

Sergey,

If I understand your concern correctly, you are concerned about signals outside of your RX filter bandwidth interfering with the decode of signals inside of your RX filter bandwidth. Or you are just concerned that you are hearing anything at all outside of you RX filter bandwidth and I can understand that. In your example, you are using ft8 , however, you audibly hear a rtty signal outside of your RX filter bandwidth and you do not want to hear it. I heard it also.

I have used ft8 and the faster ft4 at the sharpest filter setting and had no issues with decode. At the sharpest filter setting for digital, I doubt that you will continue to hear much of anything outside of you RX filter bandwidth if that is your goal. SSDR user guide explains

The three sliders in the Filters tab control the RX filter sharpness/latency for the three mode groups,

Voice (USB/LSB/AM/SAM/FM), CW and Digital (DIGU, DIGL, DFM, RTTY). The processing time, or

latency, of the digital RX filters increases as the slider is moved to the right. Sharper filters require

more processing time. In applications requiring fast turnaround of signals (e.g. certain contest

environments), faster filtering of the received signal may be more desirable than adjacent signal

rejection.

I did not see anything in SSDR user guide explaining the box that says "use low latency filters for digital modes", however please notice there is a small box to the left of that you can check to make that section "active". You do not have it checked. DO NOT CHECK IT. Also, you may have misunderstood that statement to be a guide for how to set your filter for digital modes. So you disabled AUTO and set filter to low latency. It is NOT a hint on how to set filters for digital modes. It is a specific setting for using "PACTOR" and some other digital mode if I remember correctly. I saw that in another discussion, perhaps "third party software" in a RTTY discussion talking about recommended settings for RTTY contests. It was there where someone explained that users should only check that box if they are using PACTOR and some other digital mode which I can not remember.

Bottom line Sergey. I personally have had no problems with ft8 or ft4 decodes with the "digital" slider set to max sharp filters. If you do that, I am also certain you will eliminate all signals outside of your RX filter bandwidth.

I hope this helps

73