Question for LNB expert modifiers

Reading some recent and old posts on LNB modifications, I decided to break apart an Avenger LNB this morning and modify it to inject 27 Mhz from a Leo Bodnar GPSDO.

Although somehow locking, I get very strange symmetric patterns on SDR control, and can even hear lower or upper beacon, but at many different places left and right from the center beacon.

Must definitely have made something wrong that experts will in all probabilities immediately find out when looking at the below pictures.

Thank you

Daniel

Thank you Martin for this good idea. Just tried (GPSDO with power bank), and LNB with a car battery, Same garbage signal,

Hallo Mike

You are absolutely right, I forgot the termination resistor.

Will try with the lowest output power.

(sorry to reply in English, I am from the french part of hb9...)

Thanks

Daniel