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| Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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29th Sep 2020, 10:53 am
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#1 |
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Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,959
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TV RFI filter - anyone recognise this one?
I found this filter in a drawer of old Lektrokit projects I was looking through. I think I was given it in the days when I was a Saturday boy at the RayLec TV and radio shop in Banstead in the early 1960s. It consists of pcb inductors and tubular ceramic capacitors and must have been intended for mounting on the card back of a TV set. There is no isolation from the chassis, so it was intended to be connected into a VHF set's aerial isolator. The pcb was made by TCC; presumably pcbs were one one their side-lines.
RayLec was a Bush dealer, so was this a Bush component, or maybe something that the Post Office interference investigators made available to people with complaints of patterning on screen? Ron |
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29th Sep 2020, 11:43 am
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#2 |
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Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,611
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Re: TV RFI filter - anyone recognise this one?
Well, the PCB was made by The Telegraph Condenser Company.
I may have a data sheet for such things in my TCC catalogues. I'll check.... |
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29th Sep 2020, 12:35 pm
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#3 |
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Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: TV RFI filter - anyone recognise this one?
The label does look typically Bush.
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29th Sep 2020, 1:00 pm
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#4 |
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Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,959
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Re: TV RFI filter - anyone recognise this one?
I thought the nylon feed-throughs forming the input and output connections were also a construction method favoured by Bush.
Ron |
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29th Sep 2020, 4:09 pm
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#5 |
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Dekatron
Join Date: Sep 2003
Location: Near Swindon, North Wiltshire, UK.
Posts: 3,611
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Re: TV RFI filter - anyone recognise this one?
This should help....
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29th Sep 2020, 10:34 pm
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#6 |
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Octode
Join Date: Jan 2003
Location: Guildford, Surrey, UK.
Posts: 1,959
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Re: TV RFI filter - anyone recognise this one?
Dazzlevision
Thanks for finding the TCC catalogue extract; the filter response curve was really helpful. I'm really amazed at the amount of technical data Forum members have to hand. I've unsoldered the circuit board from the metal plate to access the component side and confirm that the capacitor values are the same as the datasheet, so I've corrected my circuit diagram sketch. Presumably, Bush or some other manufacturer fitted the TCC filter module to the backing plate to make the finished product. Ron |
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