Building a Standards Converter

[ppppenguin]

Excellent idea - with a link from this thread to the new one for continuity.

No sooner said than done

https://golbornevintageradio.co.uk/forum...p?tid=7466

[Jac Janssen]

With the help of Frank and VHDL-help by Jeffrey, I have some preliminary results with my Hegdhog on 567 lines.
I can now switch it between 405 or 567 output and between several series of modulator frequencies.
The 567 line sets tend to drift a bit during warm-up, and the FM sound thus gets easily distorted. For this I programmed several RF frequencies with approx 30 kHz steps between them, so I can fine tune the Hedghog RF output to the momentary requirements during warm-up.

A lot of work still needs to be done regarding the precise timing of picture contents, porches and sync signals and for getting the interpolation even better than now.
The provisional set-up to enable me to test and improve everything further:

       

Results are quite watchable now already.
Please forgive me for the bad photo quality.

   

I'll try to make a photo of the direct view console set @ 567 as well.

Jac
p.s. was this called "The Daily Fable" in the UK (the series on the screen, not my post )?

[`FRANK.C]

Hi Jac
Well done that is really looking good.
I really like that console set.

Frank

[Jac Janssen]

Thanks Frank,

That large console is a projection set. Screen size is 40 x 30 cm, in compliance with the 4:3 aspect ratio of the 567 standard.
Somewhat later, but also in 1948, Philips decided to make a direct view console model, using the projection set chassis as much as possible.
The CRT is 9".
Here you see the 9" console in front of the projection console:

   

The 9" console is about the height of a Pye D16T receiver, but a bit wider to house all those large chassis.

I'm very happy to have these extremely rare sets, and of course that I can now operate them at their original 567 line standard!

Jac

[`FRANK.C]

Hi Jac
That is another lovely set. You should be proud of it.

Frank

[ppppenguin]

Jac, you've got some lovely sets there. Working as their designers intended thanks to Frank's Hedghog.

[peter scott]

Superb!
Peter