 | | From: | ewyatt at excite.com | | Subject: | Antenna TV Reception Problem | | Date: | 16 Jan 2005 15:07:06 -0800 |
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 | Here's a low-tech TV question! What causes a wide horizontal band to
slowly cycle vertically (continuously) on a TV using an outside
antenna? This is only on some channels above 24, or so. It's
definitely NOT a TV hardware problem, since other lower channel numbers
look great and some channels above 24 are OK as well. Maybe I need a
filter of some kind?? Any ideas on cause and fix? Thanks.
EW
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| | From: | Ray K | | Subject: | Re: Antenna TV Reception Problem | | Date: | Mon, 17 Jan 2005 09:03:40 -0500 |
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| ewyatt@excite.com wrote:
> Here's a low-tech TV question! What causes a wide horizontal band to
> slowly cycle vertically (continuously) on a TV using an outside
> antenna? This is only on some channels above 24, or so. It's
> definitely NOT a TV hardware problem, since other lower channel numbers
> look great and some channels above 24 are OK as well. Maybe I need a
> filter of some kind?? Any ideas on cause and fix? Thanks.
>
> EW
>
The cycling band means that your set is picking up a vertical sync
signal from some channel that has a slightly different vertical sync
frequency than that of the channel you are watching.
Perhaps your antenna is picking up stray leakage from a neighbor's cable
connection that isn't perfectly shielded or grounded. Also, are you
using shielded (and grounded)75-ohm cable right from your antenna to the
TV set? If you're using 300-ohm lead-in (the flat, not round, cable),
replace it with 75-ohm cable and at the antenna, install a 300-75 ohm
matching transformer.
Ray
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| | From: | ewyatt at excite.com | | Subject: | Re: Antenna TV Reception Problem | | Date: | 17 Jan 2005 15:05:31 -0800 |
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| Thanks for the info, Ray. The matching transformer may be my solution.
I hope so -- thanks again.
EW
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