[QuadList] Shinybow SG-3680 RGB-to-CVBS, Y/C Converter Funny

[John M]

As Ted said, I actually meant through, with a through button don the
machine. The W1 is only stereo and composite video, with the W3 having
Svideo as well I think. The conversions I have done have been perfect, even
down to the right vertical group pulses etc as seen on a WFM. 
I remember Sydney ABC had a Ferseh optical SC in '74 with one luma tube and
another "chroma" tube, displaying a pattern of dots moving with the chroma
content in the pic. Fascinating to watch! By 78'79 we had the mutistandard
Quantel digital unit. One thing with the Ferseh, you could send any dirty
video through it, including IVC, Umatic and VHS/Beta recordings without the
use of a TBC !
 
Cheers
John

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From: QuadList [mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of
James Paterson
Sent: Wednesday, 25 June 2014 13:52
To: Quad List
Subject: Re: [QuadList] Shinybow SG-3680 RGB-to-CVBS, Y/C Converter Funny


what is "EE" conversion?
 
The thing is there appears to be a number of methods used in conversion to
discard/combine frames or upscale/downscale the 100 lines difference etc
 
In australia, all the NTSC programs were once standards converted very
poorly with blurry image, green or yellow faces and a shimmer like
interpolation on movement.  In time its been greatly improved
to the point you often cant see any conversion artifacts.
 
My dvd recorder will convert an NTSC dvd to PAL but will create jerky
movement, ...obviously dont want to spend on a unit that does exactly the
same type of thing.
 
John..does that model VHS machine act as a "through" converter in itself, or
only of tapes it plays back?
 
What sort of method does it use to convert...how does it affect the image on
movement?
!
Always harder to find these type of things in australia.. as compared to
overseas!
 
James
 
www.austvarchive.com

----- Original Message ----- 
From: John M <mailto:john at jmit.com.au>  
To: 'Quad List' <mailto:quadlist at quadvideotapegroup.com>  
Sent: Wednesday, June 25, 2014 11:32 AM
Subject: Re: [QuadList] Shinybow SG-3680 RGB-to-CVBS, Y/C Converter Funny





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Hi James,
I have a Panasonic W1 VHS machine that will play any standard - did a stack
of Ken Copeland tapes for our local Church. It will also do an "EE"
conversion. Of course, most of our stuff here in Oz is NTSC to Pal.It is
what I would call as lo-Pro machine, with no inbuilt tuner but fitted with
IEC power socket etc etc. That said, it does a great job of conversion with
clean burst blanking etc on a WFM. They come up occasionally on Ebay. This
one is from an Ad agency. It has selector buttons on the front panel for the
direct mode, with slide switches behind a panel for recording mode etc,
Cheers
John

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From: QuadList [mailto:quadlist-bounces at quadvideotapegroup.com] On Behalf Of
James Paterson
Sent: Wednesday, 25 June 2014 10:42
To: Quad List
Subject: Re: [QuadList] Shinybow SG-3680 RGB-to-CVBS, Y/C Converter Funny


Interesting you should make a post about Shinybow products...
 
I was considering their NTSC> PAL standards converter for some basic
conversion from an NTSC s-video camera signal to a PAL system.
 
However, seeing that its in the somewhat lower end of the market i wondered
how well it performed this conversion as if it introduced dropped frames as
its method of conversion resulting in jerky video
then it would not be suitable for the job, emailing them to see if they had
a demo video or could explain what method it uses to convert, they couldnt
answer
 
Perhaps someone could reccomend a decent but lowest priced converter that
does the job without noticable dropped frames or jerky motion
 
James

----- Original Message ----- 
From: Steve Burgess <mailto:saburgess at btinternet.com>  
To: quadlist at quadvideotapegroup.com 
Sent: Wednesday, June 25, 2014 9:30 AM
Subject: [QuadList] Shinybow SG-3680 RGB-to-CVBS, Y/C Converter Funny





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Hi folks
 
Attached are pics of both sides of the (rather nice) PCB for this
eBay.co.uk-sourced SB-3680 RGB-to-CVBS, Y/C converter (serial: 20048001106).
 
It uses a KA2198BD encoder chip wired for PAL operation (pin 7 grounded) and
a 4.43MHz crystal oscillator employing a Schmitt-trigger inverter.
 
Inspection reveals that R1 and C5 are not fitted, which means the 4.43MHz
subcarrier is not reaching pin 6 of the KA2198BD b so no wonder I am having
problems with the chroma output.
 
Also, the KA2198BD datasheet says that for PAL the components connected to
pin 17 should be 82uH and 15pF whereas 100uH and an unmarked capacitor are
actually fitted; if the capacitor is 20pF, these values are what the
datasheet says should be fitted for NTSC operation.
 
Weird.
 
eBay seller swears blind it was working ok but decided not to return as paid
next-to-nothing for it and was curious to get to the root of the problem.
Ibve e-mailed Shinybow in Taiwan.
 
Steve Burgess
retired, ex-BBC/Channel 4 UK



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