[opendtv] Re: Transition report
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Tue, 16 Jun 2009 23:31:24 -0700
>I also question the bandpass response of the signal displayed on the
>spectrum analyzer. Could this be caused by their CH 6 analog antenna?
It is a very linear roll off, could certainly be the transmit antenna.
Are they using the same antenna as was used for analog? If so, did you ever
look at the analog spectrum? If it is the same antenna shouldn't this
problem also have been present?
Dale
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Cliff Benham
Sent: Tuesday, June 16, 2009 1:53 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Transition report
Manfredi, Albert E wrote:
> To me, the problem with VHF, high VHF at least, is not so much that
> stations decided to use it, but it's that some misguided recommendation
> says that 12 dB less ERP than analog is fine. And even worse than that,
> that stations up and down the East coast have adopted ERP levels between
> 14 and 18 dB less than their previous analog signal. That's silly.
>
> Even if by some theoretical turn of math you can show parity at 12 dB
> less than analog, how does that account for the digital cliff? A dark
> screen is what happens when one forgets about signal margin.
Today, I finally got some CH 6 reception by adding a pro-grade
20 dB gain RF amp to the VHF antenna 25 feet above ground.
Video still breaks up occasionally and the sound is gone 1/2 the time.
The 20 dB amp figure roughly correlates with your comments about ERP
levels, Bert.
I also question the bandpass response of the signal displayed on the
spectrum analyzer. Could this be caused by their CH 6 analog antenna?
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