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

[John M]

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  <mailto:saburgess at btinternet.com> Burgess 
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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