Video Detector
Posted: Sun Nov 10, 2013 12:50 pm
Hi All,
FYI, running LM1881 sync pulse detector. NE567 tone decoder, as video switch for GB3GV analog, and has worked well for many years.
Since we have been playing with DVB-S sat boxes, have noticed, after some head scratching, the reluctance for the detector to operate and switch to Tx 100% of the time, the detector is after the default analog and digital inputs A/V switcher, so have now adjusted the 567 for sat boxes and analog sill works fine.
Frustrating when analog was fine and looking for reasons that 23cms and 437mhz digital was not making it!
73
Peter
FYI, running LM1881 sync pulse detector. NE567 tone decoder, as video switch for GB3GV analog, and has worked well for many years.
Since we have been playing with DVB-S sat boxes, have noticed, after some head scratching, the reluctance for the detector to operate and switch to Tx 100% of the time, the detector is after the default analog and digital inputs A/V switcher, so have now adjusted the 567 for sat boxes and analog sill works fine.
Frustrating when analog was fine and looking for reasons that 23cms and 437mhz digital was not making it!
73
Peter