On your 7900, you need to toggle the ENC, DEC, ENC DEC, settings until you find the one that works, then save it. I think it's just ENC that works on the 145.310, but I have struggled with that as well. And I too can't get the Baofeng to connect with the 145.310 reliably, in fact it has only worked once for me. I have been meaning to try an external antenna just to see if it helps, but I think the problem lies within the programming software & programmer. The 145.145 should work flawlessly though, can you hit that one?
82 fj40, 99 uzj100, 06 gx470
05 525EXC, 01 XT225, 07 TTR90, 07 CRF50