27-07-2020, 08:54 AM
I might have got one of the two off you, but I've no memory of it.
https://www.radiomuseum.org/r/murphy_b283b_28.html
I see I never uploaded photos.
I have the PSU open. Someone hard wired it to the 240-250V position, not unreasonable in Modern UK. A 22 Ohm fixed resistor rather than 30 Ohms with adjustment, so either a design change or renovation. The circuit diagram also shows an on/off switch. I can't see where such a thing would have been fitted.
I shut down the laptop after the last post, but rechecked MW just after 10pm and the BBC R. Scotland had appeared. The shorter wavelengths / higher frequency MW comes in first as as dusk falls. I'd always wondered if that's why Luxembourg was on 208, to maximise UK listening. Totally crazy that its legal night time transmissions targeted UK with advertising for maybe over 30 years, yet Government was determined to maintain BBC Radio monopoly even in 1955 when adding VHF (really only for South East Coast Third Programme listeners) and Commercial TV. The 1960s Piracy was inevitable. They, of course, were constrained by ship mounted mast size, as well as wanting from dusk extra coverage so clustered at the short end of MW. The USA added extra space to MW for sports stations (up to 1700 kHz?) and even today the pocket AM/FM sets are called Sports Radios in some adverts, to listen to commentary in the stadium.
There was Regional radio on BBC till 1939 which essentially didn't restart till early 1970s. Ireland had Cork and Dublin as well as the Athlone National station till WWII and apart from brief experiments there has never been a return to Regional Broadcasting with Radio Telfis Dublin. In maybe ironic branding, the RTE Networks which was to be spun off like UK transmitter sites (now practically Arqiva monopoly) was rebranded 2RN. Maybe your Grandfather would have remembered 2RN broadcasting!
https://www.radiomuseum.org/r/murphy_b283b_28.html
I see I never uploaded photos.
I have the PSU open. Someone hard wired it to the 240-250V position, not unreasonable in Modern UK. A 22 Ohm fixed resistor rather than 30 Ohms with adjustment, so either a design change or renovation. The circuit diagram also shows an on/off switch. I can't see where such a thing would have been fitted.
I shut down the laptop after the last post, but rechecked MW just after 10pm and the BBC R. Scotland had appeared. The shorter wavelengths / higher frequency MW comes in first as as dusk falls. I'd always wondered if that's why Luxembourg was on 208, to maximise UK listening. Totally crazy that its legal night time transmissions targeted UK with advertising for maybe over 30 years, yet Government was determined to maintain BBC Radio monopoly even in 1955 when adding VHF (really only for South East Coast Third Programme listeners) and Commercial TV. The 1960s Piracy was inevitable. They, of course, were constrained by ship mounted mast size, as well as wanting from dusk extra coverage so clustered at the short end of MW. The USA added extra space to MW for sports stations (up to 1700 kHz?) and even today the pocket AM/FM sets are called Sports Radios in some adverts, to listen to commentary in the stadium.
There was Regional radio on BBC till 1939 which essentially didn't restart till early 1970s. Ireland had Cork and Dublin as well as the Athlone National station till WWII and apart from brief experiments there has never been a return to Regional Broadcasting with Radio Telfis Dublin. In maybe ironic branding, the RTE Networks which was to be spun off like UK transmitter sites (now practically Arqiva monopoly) was rebranded 2RN. Maybe your Grandfather would have remembered 2RN broadcasting!
