Group Project: Building the Hedghog 405 standards converter  

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FRANK.C
(@frank-c)
Estimable Member Registered

Hi Frank
The BBC research and development site is a great resource. We are so lucky to have it.
It has many papers on standards conversion.
A couple more example are:

Choice of interpolation apertures for line-store standards converters
Digital line store standards conversion: Determination of the optimum interpolation aperture function

Frank

Hedghog web page http://www.electronics.frankcuffe.ovh/hedghog

ReplyQuote
Posted : 09/12/2018 11:17 pm
Nuvistor
(@nuvistor)
Famed Member Registered

Yes I saw those papers, I must admit a lot of it is over my head but I take in what I can.

The list on the Data part of this forum gives an easy to find link to the papers. Yesterday I spent reading about the site survey for what would become the Holme Moss Ch 2 BBC transmitter site and how they decided on that location. Then to Les Platons in the Channel Islands and how a 1Kw TX on Ch 4 would cover both islands.

A document on 3 cheap FM converters to be used with a MW radio to evaluate how well they worked, not very well was the outcome.

The BBC did a lot of R&D, presume it’s now very little if any.

 

 

Frank

ReplyQuote
Posted : 10/12/2018 9:29 am
FRANK.C
(@frank-c)
Estimable Member Registered

 I have added legends to the Hedghog website suitable for the smaller Multicomp case case suggested by Golborne Vintage Radio Forum member Neutron.

Frank

hedghog small back a
hedghog small front a

Hedghog web page http://www.electronics.frankcuffe.ovh/hedghog

ReplyQuote
Posted : 26/12/2018 1:37 pm
FRANK.C
(@frank-c)
Estimable Member Registered

If anyone wants one I have a number of Hedghog  PCB's for sale. The cost is 7 euro which includes UK postage.

Frank

Hedghog web page http://www.electronics.frankcuffe.ovh/hedghog

ReplyQuote
Posted : 28/12/2018 2:10 pm
FRANK.C
(@frank-c)
Estimable Member Registered

I have been ask a few times if I would supply complete Hedghogs but as I have said right through this project I am not in a position to do that. Forum member Freya(Stephen) has stepped into the breach as he has told me that he is willing to supply complete Hedghogs. So anyone looking for a complete one, can get in contact with him.

Frank

Hedghog web page http://www.electronics.frankcuffe.ovh/hedghog

ReplyQuote
Posted : 16/01/2019 6:47 pm
FRANK.C
(@frank-c)
Estimable Member Registered

I have updated the program so the converter can convert from 16:9 to both 4:3 and 5:4 as well as converting from 4:3 to 4:3 and 5:4. To facilitate this the top two positions of the tone switch are now used to switch between 4:3 and 16:9 input. The selection of 400 Hz or 1KHz tone is now done on the DIP switch SW8-D. The new program file and legends to suit can be downloaded from the Hedghog web page.

aspect ratios

.

Hedghog web page http://www.electronics.frankcuffe.ovh/hedghog

ReplyQuote
Posted : 03/02/2019 5:58 pm
Doz
 Doz
(@doz)
Noble Member Registered

I'm about to order some PCBs from PCBway (for other projects) Does anyone want any hedghog PCBs while I'm at it?

ReplyQuote
Posted : 06/02/2019 3:39 pm
Doz
 Doz
(@doz)
Noble Member Registered
Posted by: FRANK.C

I have updated the program so the converter can convert from 16:9 to both 4:3 and 5:4 as well as converting from 4:3 to 4:3 and 5:4. To facilitate this the top two positions of the tone switch are now used to switch between 4:3 and 16:9 input. The selection of 400 Hz or 1KHz tone is now done on the DIP switch SW8-D. The new program file and legends to suit can be downloaded from the Hedghog web page.

aspect ratios

.

Crikey! Missed that! Thanks Frank!!

 

ReplyQuote
Posted : 06/02/2019 3:40 pm
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