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8662Re: Audio

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  • pdejonck
    Dec 24, 2013
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      OR, it could just be a manufacturing defect or poor quality speaker.

      Paul
      WB6GHK

      --- In BCD396XT@yahoogroups.com, MCH <mch@...> wrote:
      >
      > And "slightly" exceeding the spec is all it takes to blow a speaker if
      > you are close to the limit to star with. Of course, "Slightly" in this
      > case is double the voltage which is what will happen if you monitor a FM
      > transmission in NFM or AUTO mode. It may not sound like much to your
      > ear, but it is greatly different to your speaker. And if the speaker is
      > rated at 5V (just picking numbers for this example), and the normal
      > maximum audio fed to it is 3V you will be fine, but doubling that means
      > you would be feeding 6V which can easily damage the speaker.
      >
      > Nothing you said invalidates this technical example. I don't see what
      > programming knowledge or being a RR admin have to do with this. In fact,
      > there are lots of incorrect entries on RR for modulation, so I guess if
      > it comes down to an incorrect setting, and it was DLed from RR, that
      > could be a contributing factor. ;-)
      >
      > But, it is a fact that choosing the wrong modulation COULD result in
      > higher-then-spec levels to the speaker, and it is a fact that
      > higher-then-spec levels could blow a speaker. Just ask anyone who
      > connected a 100W stereo up to a 50W speaker (or even a 60W stereo). It's
      > the exact same theory.
      >
      > Bottom line is to program the correct modulation for the channel and you
      > should be able to avoid prolonged excessive levels. This is good
      > engineering practice, and I would hope you would agree.
      >
      > Joe M.
      >
      > Ronski45 wrote:
      > >
      > >
      > > Changing modulation will only change the volumes slightly, if your using
      > > the wrong modulation the audio is only going to change slightly but not
      > > completely cut out as was mentioned. This not a modulation issue.
      > > See upman
      > > http://forums.radioreference.com/uniden-scanners/144068-396t-vs-396xt-speaker.html#post1066999
      > > "The audio level (volume) will be unbalanced. If the xmit is FM and you
      > > pick NFM, it will be too loud as compared to properly demodulated
      > > signals. If it is NFM and you pick FM, it won't be loud enough."
      > >
      > > Wrong modulation wont make the speaker stop is all Im saying.
      > > Ive programmed about 300 radios and am a database admin at radioreference.
      > >
      > > Other thing is when the other faulty radios came to me they all said the
      > > same about static, missing audio at times before hand then nothing as
      > > was also mentioned originally .
      > >
      > > MCH <mch@...> wrote:
      > >
      > >
      > >
      > > As I mentioned before - just make sure you are using the correct mode
      > > for the channel. It's quite possible that most of these cases come down
      > > to the incorrect channel settings - specifically, using AUTO or NFM on
      > > channels that are still using FM modulation. This results in raising
      > > the
      > > audio level, and while some people endorse that since it results in
      > > louder audio, it might result in higher-than-spec levels going to the
      > > speaker and causing damage.
      > >
      > > If in doubt, use FM and not AUTO or NFM.
      > >
      > > Joe M.
      > >
      > > Jm Adams wrote:
      > > >
      > > >
      > > > Just hope Uniden got the issue figured out and current production
      > > has
      > > > better speakers. I really like my scanner I purchased it back in
      > > July so
      > > > now I'm on pins and needles hoping the speaker in my unit doesn't
      > > take
      > > > a dump on me
      > > >
      > > > Sent from my iPhone
      > > >
      > > > On Dec 24, 2013, at 7:35, Ronski45 <ronski45@...
      > > > <mailto:ronski45@...>> wrote:
      > > >
      > > >> This is clearly the weak point on that radio model and the 396T.
      > > Ive
      > > >> personally seen four, three of em being less than a week old
      > > that the
      > > >> speaker is shot. Uniden didnt do their homework on this part and/or
      > > >> their supplier.
      > > >> Take a look at
      > > >>
      > > http://wiki.radioreference.com/index.php/Replace_a_Blown_Speaker_in_the_396
      > > >> One thing I keep wondering on that is what holds in the speaker?
      > > >>
      > > >> And see all the others having the same problem -
      > > >>
      > > http://www.radioreference.com/apps/Search/?cx=014732645207632841850%3Afkjydvmuoq4&q=396+speaker+replacement+&sa.x=0&sa.y=0&cof=FORID%3A9&name=Search
      > >
      > > >>
      > > <http://www.radioreference.com/apps/Search/?cx=014732645207632841850%3Afkjydvmuoq4&q=396+speaker+replacement+&sa.x=0&sa.y=0&cof=FORID%3A9&name=Search>
      > > >>
      > > >> OB <ob1309@... <mailto:ob1309@...>> wrote:
      > > >>
      > > >>
      > > >>
      > > >> Had that happen twice on the speaker on the original unit and then
      > > >> the replacement one too. Third one is holding up nicely. All
      > > >> repaired under warranty by Uniden Australia (Sydney).
      > > >>
      > > >> OB
      > > >>
      > > >> On 24 Dec 2013, at 05:13, <K4ADD@... <mailto:K4ADD@...>>
      > > >> wrote:
      > > >>
      > > >>>
      > > >>>
      > > >>> I have no audio on my internal speaker on the 396XT.
      > > >>> External speaker is extremely low at full volume. For 2 or
      > > >>> 3 days before it quit, the audio sounded a bit distorted.
      > > >>> Anyone have similar problems? Sending it to Uniden after
      > > >>> Xmas, under warranty. Thanks gang. Ed
      > > >>>
      > > >>>
      > > >>
      > > >> --
      > > >> Sent from my Android phone with K-9 Mail. Please excuse my brevity.
      > > >
      > > >
      > > >
      > > >
      > > >
      > > > ----------------------------------------------------------
      > > >
      > > >
      > > > No virus found in this incoming message.
      > > > Checked by AVG - www.avg.com
      > > > Version: 9.0.932 / Virus Database: 3658.1.1/6446 - Release Date:
      > > 12/24/13 02:41:00
      > > >
      > >
      > >
      > > --
      > > Sent from my Android phone with K-9 Mail. Please excuse my brevity.
      > >
      > >
      > >
      > >
      > > ------------------------------------------------------------------------
      > >
      > >
      > > No virus found in this incoming message.
      > > Checked by AVG - www.avg.com
      > > Version: 9.0.932 / Virus Database: 3658.1.1/6446 - Release Date: 12/24/13 02:41:00
      > >
      >
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