Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!linus!vaxine!wjh12!genrad!decvax!mcnc!unc-c!dya
From: dya@unc-c.UUCP
Newsgroups: net.micro.cbm,net.micro.cbm
Subject: Re: American C-64 in England
Message-ID: <1323@unc-c.UUCP>
Date: Thu, 19-Apr-84 11:24:58 EST
Article-I.D.: unc-c.1323
Posted: Thu Apr 19 11:24:58 1984
Date-Received: Fri, 20-Apr-84 01:25:59 EST
Lines: 27

References: ihuxu.291


      Well, not exactly.... 50 hz, and 15625 hz ( 310 lines )... but all
625 are displayed anyway....

      The killer is going to be 1) colour burst frequency and 2) audio
subcarrier frequency. In PAL-B, I think the colour burst is 4.432 mc and
the audio is 5.1 mc.

     Actually, the monitor ( if it one of those godawful tv-sets-with-a
-video-input jack * ANOTHER FLAME * ) will care very greatly what the power
line frequency if it uses an SCR time-duration switching regulator. Aside
from the 10hz crawl in the image, the time constants in all this circuitry
will definitely dislike the 50hz line frequency. Most TV sets nowadays use
a mighty strange arrangement for working. For example, RCA uses the charge
of a capacitor through a saturable reactor to just tickle the horizontal
oscillator into operation..this then starts up the entire receiver. Mine says
60 hz only on the back.

     Even if your TV set has a real POWER TRANSFORMER,  you will still have
to put up with possible 10 hz ripple/bars in the image. I've done the opposite
here ( 625/50 in a 60 hz country ) and even on a $ 6000 Conrac there is some
of this effect ( presumably due to modulation of the HV supply ).

David "Hi-Fi video that you've been reading about is a FARCE" Anthony
( decvax,akgua,philabs ! mcnc !urp!dya )