15-09-2020, 03:39 PM
The 9-90UB has - if I remember correctly - has a 2.5 MHz bandwidth on its VHF tuner, but 3.5 MHz on its UHF tuner.
Therefore if you insert 405-line video via a UHF modulator (negative vision modulation, FM sound, etc), depressing the VHF and UHF selector buttons simultaneously on a 9-90UB, you IN THEORY get a 3.5 MHz bandwidth to display 405 (the quoted bandwidth for 405 being 3.0 MHz, I believe). At any rate, the 405-lines pictures appear to have better horizontal resolution via UHF than VHF on a 9-90UB.
Should you wish, you can also display 625-line pictures via a system A modulator (converter function bypassed) on a 9-90UB (both VHF and UHF selector buttons 'out'), but the 625 display is in theory now restricted to 2.5 MHz, but you can potentially 'enjoy' sound-on-vision (courtesy of the AM sound) for 625-lines!
Best wishes,
Francis
Therefore if you insert 405-line video via a UHF modulator (negative vision modulation, FM sound, etc), depressing the VHF and UHF selector buttons simultaneously on a 9-90UB, you IN THEORY get a 3.5 MHz bandwidth to display 405 (the quoted bandwidth for 405 being 3.0 MHz, I believe). At any rate, the 405-lines pictures appear to have better horizontal resolution via UHF than VHF on a 9-90UB.
Should you wish, you can also display 625-line pictures via a system A modulator (converter function bypassed) on a 9-90UB (both VHF and UHF selector buttons 'out'), but the 625 display is in theory now restricted to 2.5 MHz, but you can potentially 'enjoy' sound-on-vision (courtesy of the AM sound) for 625-lines!
Best wishes,
Francis
Francis Niemczyk
