[opendtv] Re: CH 6 Gets FCC STA to increase power
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sat, 20 Jun 2009 16:57:39 -0700
> Here is a spectrum analyzer pic which indicates about a
> 10 dB higher level than previously available.
Two observations/comments:
1. The relatively linear WPVI signals roll-of, of about 5 to 6db, is
consistent with your earlier measurement. This is clearly troublesome if it
originates at the WPVI end (as Doug discussed).
It also appears to me, from the spectrum photo, that the lower sideband of
FM 89 signal extends into the WPVI space. This has always been an issue
between TV channel 6 and FM but was generally only a nuisance issue for
analog TV. Unfortunately this could be a major impediment to DTV service.
2. It would be interesting to learn what type of transmitting antenna is
utilized by WPVI. Certain antennas exhibit a frequency response problem,
known as Beam Steering, wherein the vertical beam tilt is not consistent
across the frequency band. Many UHF slotted waveguide and coaxial antennas
have this "feature" but I'm not aware that it exists in VHF antennas.
Perhaps it might in the "traveling wave" design but I don't believe they are
used for low band. Anyone have experience in this area?
Dale
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Cliff Benham
Sent: Saturday, June 20, 2009 11:42 AM
To: undisclosed-recipients:
Subject: [opendtv] CH 6 Gets FCC STA to increase power
CH 6 WPVI-DT announced on the 6AM news that the FCC granted them an STA
to increase power.
Here is a spectrum analyzer pic which indicates about a 10 dB higher
level than previously available.
Pictures have less breakup than at lower power, but audio continues to
sputter and spit sometimes
for more than one second, typically just before a picture cut. Still not
enough signal 39 miles from the tower.
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