This is the highest filter I had from the junk box without exceeding the limits of the instrument. The next filter up was centered at 902 MHz. So trying to get a sense of measurement DR would be a stretch.
This is a 6 pole UHF helical filter centered at ~ 490 MHz after re-tuning.
This noise floor of the response is HEAVILY dependent on the dressing of the cables the vendor supplies.
The cal routine I used included ISOLN as required, however, both CH0 and CH1 ports are
terminated with 50 ohm. So at UHF, if you average the noise in your head, about 70-75 dB DR.
Despite getting consistent cals with the 2 track VNA (the white gecko) or antenna analyzer, I am not certain the convoluted cal routine of the 4 track or black VNA is IDENTICAL. I would think it would be, however, some peculiar cal results do occur. Incidentally, the black unit has a firmware boot message, GEN11.TAOBAO.COM. Is this the latest firmware? I am going to guess maybe not.
