[opendtv] Re: Analog v Digital TV
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 15 Jan 2007 14:05:18 -0500
Barry Brown wrote:
> John Shutt wrote:
>>
>> You could be attenuating an offending harmonic frequency of your
>> desired ATSC station. You could be attenuating an offending
>> strong signal that is interfering with the AGC of the front end
>> of your receiver. Lastly you could be attenuating a strong
>> reflection that is overwhelming the echo canceller of your
>> receiver, although I'd put that one as a 'probably not.'
>
> Which one of these possibilities would only affect some tuners. I
> have one that accepts this signal with no problem at full strength
> connected to the same antenna through a splitter. I've been
> thinking there might be some error in the signal itself that's
> causing the problem and different receivers have different
> sensitivities to the condition.
I think John Shutt gave you some good choices. I vote for #1 or #2.
The problem could be caused by a strong intermodulation product that one
receiver doesn't cancel, or more simply by a strong signal in an
adjacent channel, preferably NTSC, that causes the AGC in the receiver
to clamp down in the channel you want. If the tuner has less than ideal
selectivity, these conditions can easily occur. And they will vary from
one receiver to the next. And they can be cured with signal attenuation.
As John said, PSIP errors would not be cured with signal attenuation.
Bert
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