Felix,
a nasty spurious at ANT, frequency exactly LO, level -20 dBm.
It is normal for the LO to be present at the antenna.
On a RX close by it will seem loud.
It will be present at a low level on TX. How do you measure -20dBm? Below full carrier?
I have never found the level of this signal to be significant. If it is really -20dBm is the mixer working correctly? Is TX IQ balance correct?
73 Alan G4ZFQ
