Closed rfrht closed 5 years ago
Hi,
Thanks for the feedback. The output of the opamp is DC biased, but there is a blocking capacitor between the opamp and the PE4259. The other connections to the PE4259 are not DC biased (at 0VDC) so do not need a blocking capacitor. There have been no issues here now in almost 200 units. We followed this application note: https://www.psemi.com/pdf/app_notes/an27.pdf
73,
Steve kf7o
Hi there, congratulations for the project!
After reviewing the schematics, I have found that U10 and U11 (PE4259 RF switches) has no DC blockers.
As per PE4529 datasheet, verbatim: "All RF pins must be DC blocked with an external series capacitor or held at 0 VDC."
Might be related to Issue #46.
Just a heads up and hope that helps!
73s de PY2RAF.