[opendtv] Re: CBA and Microprose team up on NTIA DTV Boxes
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 22 May 2008 19:27:04 -0400
Richard Hollandsworth wrote:
> If you use an RF Splitter to feed a Converter Box and
> your old TV there is a 3.5-4.0+ dB loss of sensitivity.
True, although the CECB manufacturer can still meet his -83 dBm
sensitivity requirement, at 15.x dB of C/N, without having to worry
about that loss incurred by SOME of the customers, and at no extra
expense (loss of profit) to himself.
My assumption is that in these very low profit margin designs, the
manufacturers want to avoid any extra expense. So that's pehaps why they
disabled the NTSC demod. To more easily meet their NTIA specs.
> If you use a A/B Switch, it's under about 0.5 dB.
> [BTW: Radio Shack 15-1968 is a R/C A/B Switch.]
A DPST switch would completely bypass the box, with minimal losses.
Factory installed in the box, it should be a no brainer. But again, a
small added cost.
Bert
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