Dear All ,
I know this was answered before too ( tried to find something but to no avail) , But I am a bit perplexed so if someone can shed some light on things I would be happy. (rev C possibly )
I have the Amsat down converter with the 40mhz output. I measured it all good. I made my cable(2 pin header to hoax to sma ) and directly connected it to the Adalm Pluto(external ref in port). But now it seems even more unstable than before.
When I type this :
# fw_printenv ad936x_ext_refclk <--
## Error: "ad936x_ext_refclk" not defined <--I get this ( what ? )
I tried to enable external reference for the pluto.
# fw_setenv refclk_source external
fw_setenv ad936x_ext_refclk „<40000000>”
fw_setenv ad936x_ext_refclk_override 40000000
fw_setenv xo_correction 40000000
and now my transmission is drifting like crazy even with the external reference. and I can even see it before with the TSXO ( default config on the adalm Pluto I had no issue. ) (very rarely I was drifting that much )
something like this :
and at some points even worse.
I hope someone can drop me a hint ,
Thank you in advance
5B4AKV , Alex