Bert wrote: > To me, the plan for the DTV transmitter to go back to > VHF, at power levels that are 13 to 18 dB below that of the analog > transmitter, is a *far* more likely way to lose coverage area, > compared with staying UHF and going up to 1 MW ERP. I do agree in principle. However, the cost of building a full power UHF DTV facility is prohibitive for many medium and small market analog VHF stations. The cost of the replacement UHF 1000Kw* capable transmitter together with the UHF antenna and transmission line package and a tower upgrade or replacement, are in the million(s) dollar range. Add to that the likely need for a new or upgrade transmitter building plus significantly upgraded electrical utilities and a new backup generator system together with the huge increase in operating costs (utilities and systems maintenance) and a loss of coverage is often the only viable business option. * = Equivalent to a 5000Kw capable analog transmitter > -----Original Message----- > From: opendtv-bounce@xxxxxxxxxxxxx > [mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Manfredi, Albert E > Sent: Friday, November 14, 2008 1:02 PM > To: opendtv@xxxxxxxxxxxxx > Subject: [opendtv] House Commerce Committee Probes DTV Transition > > > Would be nice for those DTV stations moving back to their VHF channels, > but at much lower power than their analog VHF is currently using, to do > a short term test. To me, the plan for the DTV transmitter to go back to > VHF, at power levels that are 13 to 18 dB below that of the analog > transmitter, is a *far* more likely way to lose coverage area, compared > with staying UHF and going up to 1 MW ERP. > > I also think that relying on the SFN idea is a losing proposition if > your goal is to increase coverage *area*. If you want to allow reception > in the entire market area, with ATSC or DVB-T, it's not practical to > space the transmitters of the SFN very far apart. That would create > zones where reception becomes difficult, probably only possible with > very directional receive antennas. Seems to me that whether you're > talking true SFN or low power gap fillers, the further you go to the > edges of coverage the less effective these multiple on-channel > transmitters become. *If* you are after coverage without gaps. > > ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.