Hi Alan,
I've got the antenna analyser firmware installed and I'm not really using the device for S parametric testing.
My 'lower noise' comment referred to a quick & dirty test (I'm at work so can't do too much right now) that produced what appears to be a more-even response above VHF frequencies after I re-calibrated the unit (50K to 900M).
Prior to this, my device provided poor SWR readings at the higher freqs.
I still need to play with it to see how things have changed but it looks better than what I was previously seeing.
When I first for the Gecko unit, I assumed the back plate had 1 side of copper - but it's just bare FR4, hence the need for shields.
Now to start playing with the source code to see if there's enough uP flash storage left to add additional SD r/w routines ;-)
Cheers,
Larry
