18-06-2021, 12:22 PM
Hi.
Indeed the Antiference boxes have a USB input and can show any pattern you want. Its a DVBV01 model see here: https://cpc.farnell.com/antiference/dvbv...hlookahead
Re the issue it is ringing. Usually caused by poor alignment but can be caused by any damping resistors across IF coils and transformers going high value and the stage "ringing". Some sets dont have these damping resistors. It also can happen in the video amp, which may have HF correction to improve definition, a cap that has changed value in the video amp can give rise to this, look around the cathode circuitry for small values 200 to 1000pf and chokes or chokes missing or shorted out by a previous repairer.
Indeed the Antiference boxes have a USB input and can show any pattern you want. Its a DVBV01 model see here: https://cpc.farnell.com/antiference/dvbv...hlookahead
Re the issue it is ringing. Usually caused by poor alignment but can be caused by any damping resistors across IF coils and transformers going high value and the stage "ringing". Some sets dont have these damping resistors. It also can happen in the video amp, which may have HF correction to improve definition, a cap that has changed value in the video amp can give rise to this, look around the cathode circuitry for small values 200 to 1000pf and chokes or chokes missing or shorted out by a previous repairer.
