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Vintage Television and Video Vintage television and video equipment, programmes, VCRs etc. |
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2nd Jun 2020, 1:16 am | #1 |
Hexode
Join Date: Oct 2017
Location: Manchester, UK.
Posts: 363
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Supervertor.
Dug this out of the attic the other day, I remember we had this in the 70's to convert the local cable TV to a UHF signal, don't suppose I could find a use for it today?
Graham. |
2nd Jun 2020, 9:59 am | #2 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,928
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Re: Supervertor.
We used to supply a village on a cable system and used Labgear Televertas which are similar. However, I can't think of a use for it. Now if it worked the other way round...
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2nd Jun 2020, 10:13 am | #3 |
Octode
Join Date: Jan 2007
Location: Dorridge, West Midlands, UK.
Posts: 1,486
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Re: Supervertor.
Looks like a simple up converter lifting the VHF channels on the Cable system into the UHF band for a standard TV. the only thought I had is it might work to lift the fixed 62Mhz modulator used in the cheap Chinese HDMI tv converters into something useful!
This is an example https://www.ebay.co.uk/itm/NEW-HDMI-...l/274325482875 There would need to be some tests to see if it had the range.
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Chris Wood BVWS Member |
2nd Jun 2020, 12:58 pm | #4 |
Pentode
Join Date: Sep 2009
Location: Dundee, UK.
Posts: 158
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Re: Supervertor.
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2nd Jun 2020, 2:13 pm | #5 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,130
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Re: Supervertor.
Surely, this was also be needed for a dual-standard set other than the very few in he UK that could receive 625 lines on VHF. Mostly, the system switch was between 405-line VHF and 625-line UHF only.
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Mending is better than Ending (cf Brave New World by Aldous Huxley) |
2nd Jun 2020, 2:32 pm | #6 | |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,643
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Re: Supervertor.
Found this on the net. Apologies for the piled up formatting, and the odd missing letter.
Quote:
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2nd Jun 2020, 4:21 pm | #7 |
Hexode
Join Date: Jan 2007
Location: Faro, Portugal
Posts: 270
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Re: Supervertor.
I remember Portatel Conversions mentioned
in the Australian article. Located in Sunbury on Thames possibly? Think the owner was a Mr Venell or similar name. |
2nd Jun 2020, 4:26 pm | #8 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,725
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Re: Supervertor.
Here is a Tele-Verta of mine, as mentioned by Glyn above.
In general, these were used in blocks of flats with aerial distribution systems that would have been too lossy at UHF frequencies. Initially a single VHF channel that did not clash with the existing 405 line VHF BBC/ITA services was assigned for BBC2, in Salford where I worked, this channel roughly corresponded to the System A Channel 8. I disagree that dual standard sets that could work at VHF 405 and 625 were rare. Thorn, 850 900, 1400 come to mind as well as a Philips and RBM chassis whose push-button tuners could be preset for the combination of line standard and band. BBC1 and ITV were duplicated on UHF at the end of 1969, and production of sets switched to single standard like the Thorn 1500 Now there was a need for two additional VHF channels, to be found in the VHF band for BBC1 & ITV 625 and these set-back boxes to convert the signals back to UHF. I am sure it was all swept away long before Channel 4 came on the scene. For any Premier League Rolex collectors watching, I've even found the "Box & Papers"
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-- Graham. G3ZVT Last edited by Graham G3ZVT; 2nd Jun 2020 at 4:52 pm. |
2nd Jun 2020, 5:20 pm | #9 |
Dekatron
Join Date: Jun 2005
Location: Warnham, West Sussex. 10 miles south of DORKING.
Posts: 9,147
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Re: Supervertor.
I used to modify dual standard receivers to work on 'wired distribution' as it was called in London. It was only a matter of keeping the VHF oscillator running when switched to BBC2/625.
Receivers did not require a UHF tuner but needed to be fully dual standard of course. To be honest I absolutely hated it! It was usually found linked in to older 405 line VHF communal aerial systems in local authority flats and was either grainy, covered in patterning, mushy sound, horrible or just completely unwatchable, probably due to lack of maintenance. I think the translator/amplifier cabinets were valve units manufactured by TELANG' [?] The channel used for BBC2 was band 1 channel 5 in London and the South East. Luckily at that time and for a number of years there was little of interest on BBC2 so the terrible pictures were largely not viewed by Mr Average. John. |
2nd Jun 2020, 5:51 pm | #10 |
Hexode
Join Date: Nov 2010
Location: Market Drayton, Shropshire, UK.
Posts: 486
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Re: Supervertor.
Reminds me of my servicing tv; s in mid Wales town of Newtown. No tv without one of these
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2nd Jun 2020, 6:29 pm | #11 |
Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,623
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Re: Supervertor.
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2nd Jun 2020, 7:39 pm | #12 |
Pentode
Join Date: Sep 2009
Location: Dundee, UK.
Posts: 158
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Re: Supervertor.
High quality equipment for wired tv systems, amplifiers, tapper units and even signal strength meters.
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2nd Jun 2020, 8:39 pm | #13 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,928
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Re: Supervertor.
The system we owned/inherited was pretty good, and provided four channels with teletext and Nicam well into the Nineties, all upconverted at the subscriber's end. The furthest subscriber was over a mile from the aerial!
It was the adoption of Sky that did for it in the end. |
3rd Jun 2020, 12:11 am | #14 |
Hexode
Join Date: Oct 2017
Location: Manchester, UK.
Posts: 363
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Re: Supervertor.
I dont remember the set we had at the time only it would be about 1975,pretty sure it was 625 line not dual standard and we used the convertor to be able to use the wired distribution system .
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5th Jun 2020, 11:12 am | #15 |
Dekatron
Join Date: Apr 2005
Location: North Wales, UK.
Posts: 6,928
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Re: Supervertor.
Yes - there was no need for a dual standard TV as the converter changed 625 line VHF to UHF. If you had a continental TV such as the Korting then you could just use an appropriate channel which some of our subscribers did, though these sets were pretty old by then.
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5th Jun 2020, 12:51 pm | #16 |
Nonode
Join Date: Jun 2013
Location: Surbiton, SW London, UK.
Posts: 2,801
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Re: Supervertor.
I remember we had a CM6022 in stock, a customer brought back a video game from the
US (c. 1980, NTSC) on ch. A3. Despite the loss of colour and sound the TV synched up OK when tuned to the relevant uhf channel. |
5th Jun 2020, 8:13 pm | #17 |
Dekatron
Join Date: Jan 2004
Location: Newcastle upon Tyne, Tyne & Wear, UK.
Posts: 8,195
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Re: Supervertor.
In our early married life we lived in a new block of flats in Stirling. This had all channels distributed on VHF. We had been given a Bush TV125 but without the UHF tuner.
It worked perfectly well on BBC2 by flipping the system switch Ed |
6th Jun 2020, 9:54 am | #18 |
Heptode
Join Date: May 2015
Location: Chatham, Kent, UK.
Posts: 965
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Re: Supervertor.
Hi here in Chatham a lot of the equiptment is still in place, old street cabinets
wiring along the houses etc, the system was Radio Rentals orignaly used for audio later for tv, In the latter early days of Sky they had a filter in the input to the Televerter to remove the scrambling frequency Radio Rentals put on the signal so they had a second Premium service. this included Sky, Eurosport, and Mtv, The filter could be made using a coax stub cut to the corect length. |
13th Jun 2020, 12:40 am | #19 | |
Octode
Join Date: Jan 2006
Location: Borough of Gateshead, UK.
Posts: 1,420
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Re: Supervertor.
Quote:
The upconverters were necessary for 625-line UHF only receivers, as the majority of UK colour sets were. They were also useful for DXTV too of course. |
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