Article View: sci.electronics
Article #9070Re: Radio Electronics descrambler
From: bruggink
Date: Thu, 20 Dec 1990 17:03
Date: Thu, 20 Dec 1990 17:03
31 lines
1706 bytes
1706 bytes
I finished building this in the past couple of days.
On unscrambled channels: it's easy to get
a vertical lock, but i have problems getting the horizontal. I also
can't seem to get consistently good color (stable and saturated);
increasing the dc level improves the color immensely, but then
tearing begins and renders the picture useless.
On the scrambled channels the same applies, but when I get both a
vertical and horizontal lock, the picture is fine except there are
4 alternating vertical regions on-screen where the picture is too light
and too dark, i.e.:
-------------------
| | | | |
| | | | |
| | | | |
| | | | |
-------------------
^ ^ ^ ^
light dark light dark
The image is there, and is watchable, but these bands are also prominant.
I don't have a scope, but the VOM values matched what was in the article
and the subsequent corrections (I ordered the parts from the source; they
sent addenda/corrections). 2 of the voltage regulators get so hot
a touch would burn you (the negative and one of the positive supplies);
I run a cable signal into a vcr, line level to descrambler, line level to
TV.
-db
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!wuarchive!zazen!dogie.macc.wisc.edu!vms.macc.wisc.edu!bruggink From: bruggink@vms.macc.wisc.edu Newsgroups: sci.electronics Subject: Re: Radio Electronics descrambler Message-ID: <4998@dogie.macc.wisc.edu> Date: 20 Dec 90 17:03:50 GMT Sender: news@dogie.macc.wisc.edu Lines: 31