UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

julie_m · 3rd Dec 2019, 4:04 pm

In case anyone's wondering, the reason for my question about sound and picture appearing on different frequencies is that the British system "I" has the sound on 6MHz, whereas the Continental system "G" has the sound on 5.5MHz. If the modulator is set for the wrong system, a modern set probably would be able to determine for itself what broadcast standard is in use, and resolve sound and picture without breaking its stride; but an older UK-only set would be expecting to find the sound 500kHz up from where it was actually appearing, so one or the other would always be mistuned.

Anyway, that does not seem to be the problem here. And the modulator is definitely modulating onto UHF, if a UHF set can receive anything out of it .....

3rd Dec 2019, 4:04 pm	#87
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: RRI T24E Chassis In case anyone's wondering, the reason for my question about sound and picture appearing on different frequencies is that the British system "I" has the sound on 6MHz, whereas the Continental system "G" has the sound on 5.5MHz. If the modulator is set for the wrong system, a modern set probably would be able to determine for itself what broadcast standard is in use, and resolve sound and picture without breaking its stride; but an older UK-only set would be expecting to find the sound 500kHz up from where it was actually appearing, so one or the other would always be mistuned. Anyway, that does not seem to be the problem here. And the modulator is definitely modulating onto UHF, if a UHF set can receive anything out of it ..... __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.