tinyGS only reports predicted doppler only as a positive value when it should vary between positive and negative depending on whether the satellite is moving towards or away from a ground station respectively. For example, in this image the satellite is moving north to south and is moving away from the ground station at OX3HI_1 so the calculated doppler should be negative whereas it is moving towards the ground stations at ve3gtc_SophyAI and ve3ghm_SophyAI so the predicted doppler should be positive.
In all cases for each of these ground stations the predicted doppler is reported as positive. OX3HI_1 should be negative and other two ground stations should be positive.
tinyGS only reports predicted doppler only as a positive value when it should vary between positive and negative depending on whether the satellite is moving towards or away from a ground station respectively. For example, in this image the satellite is moving north to south and is moving away from the ground station at OX3HI_1 so the calculated doppler should be negative whereas it is moving towards the ground stations at ve3gtc_SophyAI and ve3ghm_SophyAI so the predicted doppler should be positive.
In all cases for each of these ground stations the predicted doppler is reported as positive. OX3HI_1 should be negative and other two ground stations should be positive.