GRBAlpha - How to use digipeater or DNxD - 06. RF & AF input level

GRBAlpha satellites has very high transmitting power as 1w according to :

https://www.om3ksi.sk/en/2021/03/18/information-for-radio-amateur-enthusiasts/

When I catch the signal from GRBAlpha, the S meter of my FT-847 with the internal pre-amp enble, indicates up to level 7. You have to get more than level 2 or 3 to decode this GFSK signal, I think. This is in the opposite side of the recent digital communication like FT8, etc. So you may need multi-elements antennas with adequate gain.

On the other side, the input level from the tranceiver to PC should be lower rather than 1200bps. For example, I show you my setting of my PC below.

Please look at the upper right side on this screenshot. You can see a microphone icon and the level. When I listen to 1200bps signals, I set the level a little more than this. Too high input level causes distortion of the signal and misdecoding. I found an uploaded video on Youtube that someone received GRBAlpha signal with RTL-SDR. So many signal sounds were heard but only a little decoded. The sounds from the video was too loud and had much distortion. I think one of the reason for little decoding may be the AF input level.