[opendtv] Re: The Rome swicthoff experience
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Wed, 02 Dec 2009 16:54:27 -0500
It sure seems to me the world should find something useful to do with
(low) VHF that does not require home indoor antennas. Though maybe it's
suited for the wide open prairies or something.
How about if it was used to send from VHF big sticks to low power UHF
repeaters with tall outdoor receiving antennas? Would that work?
- Tom
Manfredi, Albert E wrote:
> http://raidigitale.wordpress.com/2009/11/19/switch-off-di-roma-come-e-andata-per-rai-uno-due-e-tre/
>
> The Rome (pop. 4M) call center reportedly got 46,000 calls by the evening of
> switchoff day (16 November).
>
> The experience in the Rome province (county) seems very similar to what
> happened here. They got lots of complaints. Various articles have explained
> that the majority of cases were just "rescan your decoder." Because there
> were two big changes. The VHF band allocations changed overnight to Euro
> standard, and all the multiplexes were reassigned after analog shutoff.
>
> Another problem was that the main RAI TV channels, RAI 1, 2, and 3, migrated
> to the RAI Mux 1, which is VHF almost everywhere. Well, surprise surprise,
> even after umpteen rescannings, lots of households were unable to receive the
> VHF multiplexes. Even though they are transmitted from three sites in the
> Rome province (Monte Mario, Monte Cavo, and Trastevere, channels 9, 11, and 5
> respectively). So, the usual suggestions to make sure you have a good VHF
> antenna, pointing to any of these locations, etc.
>
> The URL above shows that 25 percent of respondents were unable to pick up the
> RAI Mux 1 in VHF, and only succeeded with the temporary UHF location for Mux
> 1, on Ch 25. And that 50 percent failed to receive Mux 1 altogether. (Of
> course, respondents would also be likely to be folks with reception problems.)
>
> I'm afraid that they underpowered the VHF transmitters even there.
>
> The UHF muxes are all in SFN, from the two sites I had mentioned before,
> Monte Mario and Monte Cavo, 14 miles apart as the crow flies. However, since
> these are always Euro-green low power, the recommendations to antennisti read
> just as they would for any other big stick. Which is to say, point the yagi
> either to Monte Mario or to Monte Cavo, make sure the downlead is good, and
> so on.
>
> Of the three reception sites I'm familiar with, one worked out fine, the
> other gets Mux 1 via the temporary Ch 25 only, and the third is a work in
> progress. But they can always call on their trusted antennista.
>
> Oh, on a "grass is greener" note, one article explained how the US had
> already done all of this, and how much easier it was there. They did mention
> one of the reasons being, people have multiple choices of delivery media for
> TV, other than terrestrial.
>
> Bert
>
>
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