My Converter - UK Vintage Radio Repair and Restoration Discussion Forum

System A · 11th May 2008, 11:48 am

Hi everone the standards converter i use everday is my good friend David Boyne"s first attempt back in 1984 . It has no interpolation so sometimes had trouble with horizontal lines making them look stepped .
Regards . gary .

FERNSEH · 13th May 2008, 3:51 pm

Gary has used this converter since 1990 and indeed it was my first attempt at the consruction of such a piece of equipment. If it had not been for Gary the poor thing would have been scrapped and used for spares for other projects. Gary paid me a visit sometime in 1990 and noticed on the workbench a pile of PCBs and and components assembled on Veroboard. He enquired what the parts were used for and I told him that it was my first standards converter.
Anyway, to keep the story short I reassembled the converter and gave it to Gary.
This simple converter did have a simple system of line interpolation, but we couldn't get it to work properly after reassembly with the interpolator so now it exists to this day as a simple line dropping converter. Even though 220 lines of the input standard are dropped the converted 405 picture does not look all that bad.

A modulator for the converter was constructed on a 100 X 120mm PCB. The circuit is the channel 1 modulator designed by David Looser in 1984.
The article for the construction of this modulator appeared in the August 1984Television magazine.

DFWB.

ppppenguin · 13th May 2008, 4:22 pm

David Boynes is to be congratulated as the first person outside the BBC/ITV/Pye who successfully designed and/or built a 625 to 405 converter. Was it really as far back as 1984? I thought it was around 1988/89. I didn't meet David until 1986/87 and ISTR he was still struggling to get results at the time.

David Looser's excellent modulator was widely used by enthusiasts and predates my own design which used Rediffusion modules.

11th May 2008, 11:48 am	#1
System A Pentode Join Date: Feb 2006 Location: County Durham, UK. Posts: 234	My Converter Hi everone the standards converter i use everday is my good friend David Boyne"s first attempt back in 1984 . It has no interpolation so sometimes had trouble with horizontal lines making them look stepped . Regards . gary . Last edited by System A; 11th May 2008 at 12:10 pm. Reason: other thread was in the wrong place

13th May 2008, 3:51 pm	#2
FERNSEH Dekatron Join Date: Mar 2005 Location: Gateshead, Tyne and Wear, UK. Posts: 7,355	Re: My Converter Gary has used this converter since 1990 and indeed it was my first attempt at the consruction of such a piece of equipment. If it had not been for Gary the poor thing would have been scrapped and used for spares for other projects. Gary paid me a visit sometime in 1990 and noticed on the workbench a pile of PCBs and and components assembled on Veroboard. He enquired what the parts were used for and I told him that it was my first standards converter. Anyway, to keep the story short I reassembled the converter and gave it to Gary. This simple converter did have a simple system of line interpolation, but we couldn't get it to work properly after reassembly with the interpolator so now it exists to this day as a simple line dropping converter. Even though 220 lines of the input standard are dropped the converted 405 picture does not look all that bad. A modulator for the converter was constructed on a 100 X 120mm PCB. The circuit is the channel 1 modulator designed by David Looser in 1984. The article for the construction of this modulator appeared in the August 1984Television magazine. DFWB.

13th May 2008, 4:22 pm	#3
ppppenguin Retired Dormant Member Join Date: Dec 2003 Location: North London, UK. Posts: 6,168	Re: My Converter David Boynes is to be congratulated as the first person outside the BBC/ITV/Pye who successfully designed and/or built a 625 to 405 converter. Was it really as far back as 1984? I thought it was around 1988/89. I didn't meet David until 1986/87 and ISTR he was still struggling to get results at the time. David Looser's excellent modulator was widely used by enthusiasts and predates my own design which used Rediffusion modules.