I've successfully been working the Falconsat-3 PBBS, downloading files and uploading text messages. However, when I try to upload a bigger file, like an image, I can't get it to complete even across a number of passes. I've been trying to upload a 20 kB jpeg, but the most I can get uploaded is around 18%. Some passes it doesn't start to upload anything, even though I'm capturing other data coming down and it acknowledges my callsign on the system. After a few unsuccessful passes, it starts to upload again from 0%.
I'm trying to figure out which part of the link is the problem. I switch from my TH-D72 to my TM-V710 so that the uplink is 50W, so maybe my downlink is not consistent enough to hold the connection? My UHF side is only 5 elements, so maybe not as much gain as others are using.
Does it restart the upload from scratch because of how the satellite software is written or is it something with the ground station software?
Any advice would be appreciated.
-Stephen N8URE