Display MoreRenauld,
Thanks for your description of the problem but what i cannot understand is why the issues does not pop up also
when i use an external PSU?
Please can you tell me with which one you have substitute it maybe also with a photo of it?
Thanks a lot
Enzo
Hi Enzo.
You probably have some RF feedback on the power supply line at its T Bias. When you use external power supply you isolate this way. In the Bias T +12 VDC try:
- Use some ferrite (bead, core or choke).
- Use some capacitors for RF decoupling (or feedthrough capacitor).
- A shielded cable for power supply.
73 de PY1SAN
GG77SN