[opendtv] Re: 5th generation Test
- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 16 Mar 2005 10:07:02 -0800
Doug wrote:
> It's now time to try the el-cheapo 5th generation box with
> a really good single-channel filter (Blonder-Tongue?)
> in front of it for the difficult channels. If it really is the
> front end, that should make it work.
Bob, this is very good advice from Doug.
Hammett & Edison's use of a prefilter turned the early poor
performing RCA TC100(?) receiver into a moderately good
performer in their San Francisco tests. Also, Sinclair used a
similar technique on the "failed" COFDM monitor/receiver
used in the MSTV tests, turning it into a stellar performer.
Unfortunately, MSTV/NAB didn't want their results confused
by fact and summarily rejected Sinclair's findings. As I recall,
that filter was about 40 MHz wide (about six channels).
Without the proper use of selectivity, a DTV receiver doesn't stand
much of a chance in congested RF environs.
----- Original Message -----
From: "Doug McDonald" <mcdonald@xxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, March 15, 2005 9:29 AM
Subject: [opendtv] Re: 5th generation Test
> Manfredi, Albert E wrote:
>
>> Dale Kelly wrote:
>>
>>
>>>As I previously suggested might be the case, it appears
>>>that Zenith utilized a specially designed RF front end
>>>in the receiver used for the 5th Gen demonstrations -
>>>possibly never to be seen again in a consumer product.
>
>
> It's now time to try the el-cheapo 5th generation box with
> a really really good single-channel filter (Blonder-Tongue?)
> in front of it for the difficult channels. If it really is the
> front end, that should make it work. It could also
> be something else, like the chip allows different amounts of
> external memory, or uses aid from the main box CPU, and
> these were lacking in teh cheapo box.
>
> Doug McDonald
>
>
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