[opendtv] Re: New Microtune tuner
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 3 Mar 2006 18:16:07 -0500
Richard Hollandsworth wrote:
> Still not much insight into how well double conversion
> tuner helps when the RF AGC completely desensitizes the
> front end all the time....
>
> They might be suitable for cable when all signals are
> roughly equal...and provides good selectivity...but how
> well will it pull in a much lower level signal in the
> presence of other strong signals????
>
> The key test condition is trying to receive a relatively
> weak signal in the presence of several strong signals.
> Note that -83 dBm A/74 sensitivity number would be
> meaningless, presuming his 34 dB dynamic range
> adjustment range.
There is only one open question that I can see, with respect to this
tuner: is that front end AGC stage tuned or is it broadband? Other than
that:
The noise figure for OTA, at 6 dB, is just fine.
The total AGC adjustment range, at 94 dB, is excellent.
The fact that the RF amp's AGC range is 55 dB is excellent. (The rest
being provided by the IF AGC.)
The sensitivity, roughly between -85 and -86 dBm, is excellent.
The rejection of adjacent channels and beyond is excellent.
Seems like a contender.
Bert
----------------------------------------------------------------------
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.
Other related posts: