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Cellular Phone Forum / General / General Topics / May 2004

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CDMA: Which frequency sounds better?

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That guy - 16 May 2004 05:16 GMT
All things being equal, does 800 mhz CDMA sound better than 1900 mhz CDMA?  I
recently moved from Vancouver where Telus used to only use 800 mhz, to Winnipeg
where it defaults on to 1900 mhz.  The sound quality on 1900 mhz is raspy and
more disjointed.  On the other hand the other CDMA company here (MTS) uses CDMA
800 mhz here mostly and the sound quality is better, sounding like Vancouver's
Telus (800 mhz).  I haven't yet been able to test an older phone here (one that
only has 800 mhz and no 1900 mhz) to see if it makes a difference.  Has anybody
else noticed this?  I'm using a Samsung T-300 flip and an Audiovox 8100.  I
haven't found a way of having them only use the 800 mhz frequency.  They will
always default to 1900 mhz so web features and text messages can be utilized I
guess.  I don't need those features.
N9WOS - 16 May 2004 06:45 GMT
On CDMA, sound quality has nothing to do with the frequency.
The only difference the frequency will make is how solid
of coverage you will get.
(ie) Where the phone will work and where it will not.
But when it works, the frequency will make no difference.

What will make a difference is crowding, and vocorder tech
that is implemented on the two carriers.

The enhanced variable rate codec will make thinks sound a bit worse.
And band crowding will cause bandwidth to be restricted.

IF the PCS provider has a crowded band, and/or implements
the variable rate codec, and the 800Mhz provider does not,
then the 800Mhz provider will sound better.
John S. - 16 May 2004 16:52 GMT
>All things being equal, does 800 mhz CDMA sound better than 1900 mhz CDMA?  

Sound quality is a function of the vocoder and not the frequency. With all
things being equal, they would sound exactly the same and the end user wouldn't
know the difference.

--
John S.
e-mail responses to - john at kiana dot net
Joseph - 28 May 2004 16:35 GMT
>All things being equal, does 800 mhz CDMA sound better than 1900 mhz CDMA?  I
>recently moved from Vancouver where Telus used to only use 800 mhz, to Winnipeg
>where it defaults on to 1900 mhz.  The sound quality on 1900 mhz is raspy and
>more disjointed.  On the other hand the other CDMA company here (MTS) uses CDMA
>800 mhz here mostly and the sound quality is better, sounding like Vancouver's
>Telus (800 mhz).

More likely the difference is a different vocoder being used in the
different systems.

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