[opendtv] Re: Specs for coupon program-compliant STBs
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 12 Mar 2007 17:59:10 -0400
Mark Aitken wrote:
> the -5dBm is for a single signal, not multiple. The concerns regarding
> front end overload do not change. It would have been nice to address
> that one (wonder if they supply a cheap pad...which does not solve
> everything but can be a good first step...Zenith used to supply them
> with earlier DTV devices...). Could be worse (NO requirement), but
> certainly a starting place of some known level of performance...
Look on the bright side. At least it's 3 dB better than A/74 recommends.
It's also 10 dB better than NORDIG recommends.
The 5th gen Zenith, coupled to whatever tuner it was tested with by the
CRC, goes between -2.3 dBm to -78.5 dBm, so the dynamic range is shifted
up compared with this NTIA spec. Not enough sensitivity, in the version
tested in 2003.
The Samsung Gemini as tested by the CRC goes from at least +1.5 dBm (the
limit of CRC's test equipment) to -84.7 dBm, which is beyond A/74 and
beyond the NTIA spec on both sides.
Also, the Gemini passes the field ensembles test, by their criterion (no
glitches in 30 of the 50 environments). No info on the Zenith 5th gen
wrt these ensembles.
Too bad the CRC didn't test the ATI Xilleon 240, which seems to be the
popular low-cost choice.
Although this dynamic range question really only applies to the tuner.
The Xceive 5000 and the Microtune 2131 can both handle the needed
dynamic range.
Bert
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