View Single Post
Old 4th Jul 2006, 11:28 am   #16
oldeurope
Heptode
 
oldeurope's Avatar
 
Join Date: Dec 2003
Location: Solingen, Germany
Posts: 727
Default Re: New Aurora converter - help wanted with review

Quote:
Originally Posted by ppppenguin
I did not measure the audio modulator in detail. If it can only reach 90% modulation I would not regard this as a problem. This is equivalent to 1dB down from the maximum possible. A 1dB difference is just audible by direct comparison
Yes, I agree. And maybe you'll get a 99%.

The emitter follower with 0.2V sync tip and 200 Ohms pull down causes problems with some for example vintage DIN AV inputs on VCRs. They have a cap in front of the 75 Ohms load and this will cut the sync signal. I've seen some modulator schematics using cap loaded emitter inputs too. So this vision output can cause trouble.

Kind regards,
Darius
__________________
RADIO & TV SERVICE

oldeurope's blogs
oldeurope is offline