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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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9th Aug 2020, 11:49 am | #21 | ||
Dekatron
Join Date: Mar 2005
Location: Gateshead, Tyne and Wear, UK.
Posts: 7,444
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Re: French Multistandard TV’s
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DFWB. |
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9th Aug 2020, 9:26 pm | #22 | |
Hexode
Join Date: Oct 2012
Location: London, UK.
Posts: 498
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Re: French Multistandard TV’s
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DTMB has now been chosen for Laos. I've also read Cuba may use it. |
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10th Aug 2020, 6:59 am | #23 | |
Nonode
Join Date: Jan 2009
Location: Papamoa Beach, Bay of Plenty, New Zealand
Posts: 2,944
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Re: French Multistandard TV’s
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It would be interesting to know the details of the French 819/405 dual-standard receivers used in range of the Channel Islands 405 transmitters. I guess the starting point would be a standard 819 receiver, with 28.05 MHz VIF and 39.2 MHz SIF. Then for 405 you could use common VIF or common SIF. Common VIF would require a dual-frequency SIF (31.55 and 39.2 MHz), probably not too difficult, with a 31.55 MHz sound trap + low pass switched into the VIF channel on 405. But 405 would also require a steeper Nyquist slope over 28.05 MHz than 819, so more switching required. Common SIF would put 405 VIF at 35.7 MHz, so you’d need a 405 Nyquist filter switched in there, possibly combined with 34.2 MHz adjacent channel trap + high-pass. That looks easier – less switching than the common VIF approach. 3.5 MHz notch switched into the video channel after the detector for both cases. Both positive modulation, so no inversion and switching issues there. Both could use the same black level AGC system which was surely fitted (yeah, right…) Cheers, |
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10th Aug 2020, 9:22 am | #24 | ||
Pentode
Join Date: Jun 2016
Location: Stourbridge, West Midlands, UK.
Posts: 115
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Re: French Multistandard TV’s
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Patrick |
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10th Aug 2020, 11:47 am | #25 | |
Hexode
Join Date: Jan 2011
Location: Düsseldorf, Germany.
Posts: 368
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Re: French Multistandard TV’s
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on the original German models. From outside they don´t have a different look, there are a few more controls, Grundig used a motorized automatic function in 1958 models. Present in my collection of German TV sets made for de belgian market are: - Bauknecht (Barco, Bauknecht never build TV sets, well known because of their kitchen stuff) - Blaupunkt - Grundig - Körting (Neckermann) - Loewe Opta - Lorenz (Schaub but not Schaub-Lorenz!) - Nordmende - Siemens (Belgian model only) - Telefunken (German and Belgian models, in that special case the Telefunken is a Nordmende!) not presented but based on the German model: - Graetz - Nora - Tonfunk - SABA Regards, German Dalek
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10th Aug 2020, 11:59 am | #26 |
Hexode
Join Date: Jan 2011
Location: Düsseldorf, Germany.
Posts: 368
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Re: French Multi-standard TV’s
I own a rare, must be a Radiobell, TV monitor from about 1954/1955, no idea.
I got this free from the Belgian television (SVT) in Brussels to save it in my collection. The set in question looks like a standard 17"-70° table TV set in a wooden cabinet. It has no channel selector/tuner but is marked as 405 lines monitor! It seems to be that it was a part of the 405 lines/625 lines converter. There was no one who could tell me more about it. Regards, German Dalek
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And now something completly different: MARC BOLAN, he was/is the real king of Pop Music! |
10th Aug 2020, 9:06 pm | #27 |
Dekatron
Join Date: Dec 2007
Location: Haarlem, Netherlands
Posts: 4,203
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Re: French Multistandard TV’s
What do you mean by Belgian model only? In the colour era, German Siemens models were usually made by Blaupunkt. Who made them in the b/w era? Nora, then Siemens took over Nora but at some point ceased manufacturing?
I'm pretty sure I have a Barco-made Siemens colour TV set in storage but I can't reach it at this moment. For the B/W era, the "Muiderkring" schematic folders are a good way to determine which sets share the same design and I remember having seen several foreign brands sharing their schematics with Barco models. Last edited by Maarten; 10th Aug 2020 at 9:12 pm. |
11th Aug 2020, 11:32 am | #28 | |
Hexode
Join Date: Jan 2011
Location: Düsseldorf, Germany.
Posts: 368
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Re: French Multistandard TV’s
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sets under their own name which were made by Blaupunkt. I have two 1958 WSW (Wiener Schwachstrom Werke) Siemens-Klangfilm-Austria projection TV sets for the cinema. Inside are the Philips projection chassis. I know the Muiderkring schematics, have some in my collection, but these sets in question you discribe has to be 70s sets. I have an early Barco and a Cobar TV sets, their chassis and parts are different to the german TV sets. If you open a 50s Telefunken, Graetz, SABA, Körting, Loewe Opta you will realize the difference. Only the Cobar is a 4 standard TV receiver. Regards, German Dalek
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And now something completly different: MARC BOLAN, he was/is the real king of Pop Music! |
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11th Aug 2020, 12:40 pm | #29 | |
Octode
Join Date: Mar 2006
Location: Co. Durham, UK.
Posts: 1,117
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Re: French Multistandard TV’s
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It might show just how little needs to be done to resolve a watchable picture. |
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