<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"
data-hsystem="true"></head><body><style>p{margin: 0;padding:
0;}</style><p>James,</p><p><br></p><p>Most of the low cost converters do nothing
to the video, but make </p><p>it viewable by converting the chroma from 3.58
<> 4.43. In the </p><p>case of the VHS machines, the result was called
something like</p><p>NTSC 4.43 (frame rate still 60 hz, H still 15734). You
were told</p><p>to "adjust the vertical hold control for lock" to make your
PAL</p><p>TV accept the NTSC 60 Hz frame rate luminance while the
</p><p>converted simple PAL chroma was usually accepted directly </p><p>by the
TV.<br></p><p><br>
mike<br>
___________________________________<br><br></p><p><br><br><br>On Wed, 25 Jun
2014 10:41:46 +1000, James Paterson <james@oldtvgear.com>
wrote:<br></p><blockquote dir="ltr" style="border-left: 2px solid rgb(0, 0, 0);
padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;"
_mce_style="border-left: 2px solid #000000; padding-right: 0px; padding-left:
5px; margin-left: 5px; margin-right: 0px;"><br><br><hr><br><div
id="html-message"><meta content="text/html; charset=iso-8859-1"
http-equiv="Content-Type"><meta name="GENERATOR" content="MSHTML
8.00.7600.16385"><style></style><style _mce_bogus="1"></style><div><font
face="Arial">Interesting you should make a post about Shinybow
products...</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">I was considering their NTSC> PAL standards converter
for some basic conversion from an NTSC s-video camera signal to a PAL
system.</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">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</font></div>
<div><font face="Arial">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</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">Perhaps someone could reccomend a decent but lowest
priced
converter that does the job without noticable dropped frames or jerky
motion</font></div>
<div><font face="Arial"></font> </div>
<div><font face="Arial">James</font></div>
<blockquote style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px;
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"
_mce_style="border-left: #000000 2px solid; padding-left: 5px; padding-right:
0px; margin-left: 5px; margin-right: 0px;">
<div style="FONT: 10pt arial" _mce_style="font: 10pt arial;">----- Original
Message ----- </div>
<div style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"
_mce_style="font: 10pt arial; background: #e4e4e4; font-color:
black;"><b>From:</b>
<a title="saburgess@btinternet.com" href="mailto:saburgess@btinternet.com"
target="">Steve
Burgess</a> </div>
<div style="FONT: 10pt arial" _mce_style="font: 10pt arial;"><b>To:</b> <a
title="quadlist@quadvideotapegroup.com"
href="mailto:quadlist@quadvideotapegroup.com"
target="">quadlist@quadvideotapegroup.com</a>
</div>
<div style="FONT: 10pt arial" _mce_style="font: 10pt arial;"><b>Sent:</b>
Wednesday, June 25, 2014 9:30
AM</div>
<div style="FONT: 10pt arial" _mce_style="font: 10pt arial;"><b>Subject:</b>
[QuadList] Shinybow SG-3680
RGB-to-CVBS, Y/C Converter Funny</div>
<div><br></div><br><p><br></p><hr><p><br></p>
<div dir="ltr">
<div style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt"
_mce_style="font-family: 'Calibri'; color: #000000; font-size: 12pt;">
<div>Hi folks</div>
<div> </div>
<div>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).</div>
<div> </div>
<div>It uses a KA2198BD encoder chip wired for PAL operation (pin 7 grounded)
and a 4.43MHz crystal oscillator employing a Schmitt-trigger inverter.</div>
<div> </div>
<div>Inspection reveals that R1 and C5 are not fitted, which means the 4.43MHz
subcarrier is not reaching pin 6 of the KA2198BD – so no wonder I am
having
problems with the chroma output.</div>
<div> </div>
<div>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.</div>
<div> </div>
<div>Weird.</div>
<div> </div>
<div>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. I’ve e-mailed Shinybow in Taiwan.</div>
<div> </div>
<div>Steve Burgess</div>
<div>retired, ex-BBC/Channel 4 UK</div></div></div>
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