"Sounds like a problem I fixed on the one I have- no sweep. I assume you could put a length of line in S21 mode and see the dot rotate as you change frequency manually?"
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Sorry I'm a bit late answering this; didn't have access to the analyzer.
I assume you mean with the S-parameter test set with an RF patch cable between ports 1 & 2. Polar display, so should be a dot. Does indeed rotate around the rim of a circle several times as the frequency is increased (manual tuning Zero span/CW) when in B/R mode. HOWEVER, it's not a dot, but once again an *arc* I'm getting, just like the test I did with those two similar dummy loads a few ohms apart. Don't understand why I'm seeing arcs instead of dots with anything other than a dead short or complete open attached to port 1 (and now this transmission test of yours too).
Jinxie