I forgot to mention the SNA out is square wave.
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At 22-10-19, you wrote:
The antuino is designed to output -20dbm at SNA port but a lot of them
have escaped the plant
at -10db and -10dbm saturates the AD8307 and flatten the peaks. Change
R20 to 1.2K and the
in/out short show display -20dbm on the display.
At 21-10-19, you wrote:
I am a proud owner of Antuino.
I think it delivers around +10dbm in SNA plot function (correct me if
I am wrong) at the RF out and at RF in on SWR plot function. Even if
it shows - 20db on the plot. I have seen specs of crystal filters
suggesting a maximum level of - 10dbm. So around 20db attenuator should
be carefully added between the the Antuino and the crystal filter. Is
this correct? I have seen however a datasheet of a crystal filter saying
-10dbm max, however +16dbm for less than 10 seconds. So I am a bit
confused on how to test safely crystal filters with an antenna analyzer