[opendtv] Re: Transition report
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 17 Jun 2009 16:47:20 -0700
Often called a "free space: measurement IIRC. As you say, it's the only way
to do such a measurement and is difficult to do. The receiver system must be
isolated from any other structures.
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Doug McDonald
Sent: Wednesday, June 17, 2009 12:38 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Transition report
John Shutt wrote:
> Indeed, the ATSC exciter does have an adaptive equalization routine, but
> the sample point is taken at the output of the mask filter, not from a
> probe at the top of the tower sampling the output of the antenna.
>
Thus at low VHF, that could be a big big problem if the antenna were
not certified by the manufacturer for DTV. If I were a low DTV
station, I would test the signal with a non-resonant receive
antenna high in the air well away from the antenna (i.e. in the main lobe)
on a spectrum analyzer.
Doug
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