Well sir one nice thing about a Roberts is that since it's not a Hacker, you can feel free to hack it! Fun project, thanks for sharing. I thought you'd need to replace the coil on the ferrite excuse me ferret to get good signal levels off of it at 60 kHz. Then imagined hand winding a coil with those tiny, tiny wires.
Never had a hacker Joe, probably never will. To do the job properly I think the coil would need rewinding for higher inductance and maybe better Q. But would have taken ages and then trying to resonate it with the right capacitor. Too tedious. A couple of clocks I've got here do use a normal LW coil though. This was just a quick experiment to see if it would work.
Very interesting, Nick, thanks. It sounds as if you're picking up adjacent stations, which isn't surprising. Interestingly, Time from NPL, as it's called now, uses on-off keying with no modulation according to Wikipedia. If you look at the FFT from the utwente SDR it certainly looks that way. So I'm guessing that the tone we can hear is a product of the 60kHz plus adjacent channels. Incidentally, my Quansheng has arrived, but I've got my Intermediate exam on Friday and lots of other stuff going on.
Good the radio has arrived. Good luck with the exam. NPL is as you say on off keying, but the pulse width is modulated with the data. I think the 'Q' of the antenna coil is reduced so picking up another station further up the band.
I was looking at your coupling ferret and wondering whether the long wave section could be placed adjacent to the one on the radio's ferret and wired in series, reducing the extra capacitance needed there. Then I thought "why bother". Even with the Beeb vacating longwave next year tuning into the NPL transmission to pass away the long winter evenings isn't likely to ever be a popular activity. 😂 But interesting stuff Nick so thanks for sharing.
Hi Bob, all sorts could be done to improve it. More L needed and less C and more turns on the coupling coil but why bother. Not very interesting listening. Just an experiment, thanks for watching
Nice one Nick, poor old ferret!! 😁
Thanks Mike, yes ferrets can be troublesome
Well sir one nice thing about a Roberts is that since it's not a Hacker, you can feel free to hack it!
Fun project, thanks for sharing. I thought you'd need to replace the coil on the ferrite excuse me ferret to get good signal levels off of it at 60 kHz.
Then imagined hand winding a coil with those tiny, tiny wires.
Never had a hacker Joe, probably never will. To do the job properly I think the coil would need rewinding for higher inductance and maybe better Q. But would have taken ages and then trying to resonate it with the right capacitor. Too tedious. A couple of clocks I've got here do use a normal LW coil though. This was just a quick experiment to see if it would work.
Nice, thanks for that. Didn't mean for you to go to so much trouble though. Very much appreciated nonetheless.
Very interesting, Nick, thanks. It sounds as if you're picking up adjacent stations, which isn't surprising. Interestingly, Time from NPL, as it's called now, uses on-off keying with no modulation according to Wikipedia. If you look at the FFT from the utwente SDR it certainly looks that way. So I'm guessing that the tone we can hear is a product of the 60kHz plus adjacent channels. Incidentally, my Quansheng has arrived, but I've got my Intermediate exam on Friday and lots of other stuff going on.
Good the radio has arrived. Good luck with the exam. NPL is as you say on off keying, but the pulse width is modulated with the data. I think the 'Q' of the antenna coil is reduced so picking up another station further up the band.
I was looking at your coupling ferret and wondering whether the long wave section could be placed adjacent to the one on the radio's ferret and wired in series, reducing the extra capacitance needed there. Then I thought "why bother". Even with the Beeb vacating longwave next year tuning into the NPL transmission to pass away the long winter evenings isn't likely to ever be a popular activity. 😂 But interesting stuff Nick so thanks for sharing.
Hi Bob, all sorts could be done to improve it. More L needed and less C and more turns on the coupling coil but why bother. Not very interesting listening. Just an experiment, thanks for watching