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Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions.

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Old 17th Jun 2019, 8:59 am   #181
FRANK.C
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Default Re: Hedghog standards converter

Hi Taz
Thanks for the better picture.
it is something that I can keep in mind if I am updating the firmware again. I will need to look into it further.

Frank
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Old 18th Jun 2019, 3:56 pm   #182
Tazman1966
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Default Re: Hedghog standards converter

Thanks Frank
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Old 19th Jun 2019, 8:38 pm   #183
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Default Re: Hedghog standards converter

Ah, I recognise that photo!

Below is a picture, taken at the time, of the 'scope trace of that actual ITS line (line 13 / 215) from the actual generator that was used to feed the actual television in that actual picture, in case it helps at all.
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Old Today, 6:37 pm   #184
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I have an interesting problem with my Hedghog and wondered if anybody on the Forum
might have some ideas?

Can't seem to get a clean Picture at all.
Looks like the Video is extremely noisy and the TV's I've tried look like they
are struggling to Sync properly, some can't display anything sensible at all.

Stephen (Freya) has very kindly retested the HH and found no faults at all!

All my VHF TV's are mid 70's Portables and all are Uk Models and none of them
will display a clean Picture and most won't display anything viewable!

TV's tested from my collection are:
JVC 3050Uk Only Noise but clearly a signal of sorts is present
JVC CX-500GB Very Poor, just able to make out Test Card.
JVC CX-60GB Displays the best Picture, but very noisy.
JVC P100-UK Only Noise but clearly a signal of sorts is present
Crown 5TV-65R Just able to make out Test Card
Crown 5TV-525R Only Noise but clearly a signal of sorts is present

Stephen asked if the TV's were 625 Line?

I wasn't aware any VHF transmissions in the Uk were 625 Line, can anybody tell
me if the Uk used VHF 625 Line and if they did, when did this happen?

I know using VHF 625 Line was considered before the UHF 625 Line system was
established, but can't see any mention that is was ever used, having opted instead
for duplicate BBC1 and ITV on VHF and UHF.

Ian
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Old Today, 6:51 pm   #185
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Default Re: Hedghog standards converter

Mistake on previous message.
Ignore the Crown TV's they are UHF only and were from a different Test.

The other TV tested on the HH was a portable Panasonic, but I haven't got
the Model No in front of me at the moment.
It couldn't display anything either, but clearly a Signal was there.

Ian
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Old Today, 8:03 pm   #186
FRANK.C
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Default Re: Hedghog standards converter

Hi Ian
I am not familiar with the JVC TV's you have listed but from googling them they look to be probably too modern to be 405 lines. I think one is a colour TV.
Maybe others can confirm.


Does it say on them that they are dual standard?
Here in Ireland we had VHF 625 lines.


Frank
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Old Today, 9:01 pm   #187
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Hi Frank,

Yes, they are all fairly Modern Mid 70's TV's.
Two of them are colour, the CX-500 and the CX-60.
The Cx-60GB actually does display the best out of all of them,
the Picture is stable, viewable but very noisy! No sound though!

I guess it boils down to whether the Uk used 625 Line VHF,
or JVC sold incompatible 625 Line VHF Equipment in the Uk?
This is what I was hoping somebody on the Forum might be able
to shed some light on.

I had never heard of 625 Line VHF before Stephen mentioned it.
I had assumed all VHF (at least in the Uk) was 405 Line.

The User Manuals I have make no mention of any compatibility issues,
so I assume they met Uk standards of the time.

Ian
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