CDMA Carrier Frequencies

[Craig]

Can someone explain the concept of carrier frequencies in CDMA? I
understand that CDMA uses a fixed bandwidth of 1.25mhz and shares the
1.25mhz with all the users on that cell. In CDMA, all cells are on
the same frequency which allows soft handoff, easier deployment etc.
Are added carrier frequencies for one carrier just more capacity on a
per cell basis? My phone is usually on channel/CF 650, I am a Sprint
user. I noticed that when I force my phone to Verizon 800mhz CDMA,
it picks up carrier frequency 384 or 548 in some areas, however my
fiances phone which is right next to mine picks up channel 466 and
wont pick up anything else. Her phone seems to pick up 466
everywhere, she is a verizon subscriber.... Thanks.....

[Quarterwave Radio]

You pretty much got it.

Code Division Multiple Access

I am user # 1, you are #2, jo-bob is #3 all on the same freq, but
multiplexed by code, rather than time slices. (tdma-nextel, etc)

Your lady's phone probably "homes" on a channel because she is a subsciber
to their service and yours is using a roamer channel with lower priority
access.

"Craig" <cga...@aol.com> wrote in message
news:1f865ac1.02062...@posting.google.com...

[Frank Harris]

Craig wrote:
> Are added carrier frequencies for one carrier just more capacity on a
> per cell basis?

Yes. Cells add additional 1.25MHz carriers for additional capacity,
though for best results it needs to be done throughout an area, rather
than just on a few cells, because I don't know if a cell can hand off to
another cell which doesn't have the same carrier. Here in the SF Bay
Area, Sprint uses 3 carriers: 50, 75, and 100.

Lots more info at http://denbeste.nu/cdmafaq/

--
- Frank Harris in San Francisco with an SCH-3500

[Rich Gozynya]

I'm sorry. I hope you got the insurance (before the wire in the hinge
gets cut and the speaker fails)

For instant warranty claims, just place you phone in a microwave ,with
the battery removed, for exactly five seconds. This should destroy
every semiconductor in the handset but it should not smelled burnt.

Frank Harris <fran...@XcompuserveX.com> wrote in article
<3D1BE9A9...@XcompuserveX.com>:

[posted via phonescoop.com - free web access to the alt.cellular groups]

[Pobert Rayne]

Yea, that is what happened to my Samsung 3500. Great phone until that
happened (over a year, maybe 1.5 years)

Im now pimpin' the Sanyo 6200, so no complaints. Had a LG 4NE1 for a few
days, that phone was a no go..... Too basic, as the name implied.

"Rich Gozynya" <rICHARD...@HOTMAIL.COM> wrote in message
news:uho03jt...@corp.supernews.com...

[Adam West]

CDMA phones can do a hard handoff to change carrier frequency while in use.
Also they can hard handoff to drop from CDMA to analog while in use, but not
vice versa.

Adam

[Adam West]

Craig wrote:

> I noticed that when I force my phone to Verizon 800mhz CDMA,
> it picks up carrier frequency 384 or 548 in some areas, however my
> fiances phone which is right next to mine picks up channel 466 and
> wont pick up anything else. Her phone seems to pick up 466
> everywhere, she is a verizon subscriber.... Thanks.....

The acquisition table in her phone is set up differently than yours. My
Verizon StarTac 7868 also seems to prefer 466 in most areas (Wash DC, most
Montgomery county suburbs) but will switch to 425 north of Germantown MD
until Frederick MD, where it switches back to 466. My older StarTac 7760
always stays on 384 no matter where I go (likely due to it not having or
supporting a PRL list). My guess is that the newer phones are programmed
this way to allow older CDMA phones like my 7760 to have plenty of room.
The only time I ever say my 7868 change frequency in DC was on 9-11, when
it jumped to 507, due to extreme cell usage.

Adam

[Jerome Zelinske]

Maybe if you have a different carrier that has both cdma and
analog, but not with Sprint PCS.

[gkowal]

Adam West wrote:

How can you keep track of all this, without having something like a 50 lb
spectrum analyzer around you?

GK

[Adam West]

Correct, I was talking about my Verizon phone. System boundaries between different
carriers almost always drop calls, with a few exceptions.

Adam

[Adam West]

Test mode. I only wish my 7867 would allow test mode like my 7760 and 7868,
thanks a bunch Sprint for locking it out.

Adam

[Craig]

Certain phones allow you to view the information, if you have the
right code. I have a Sprint Audiovox/Toshiba 9100 which has a useful
diagnostic/debug/analyze screen.

gkowal <gkowal...@earthlink.net> wrote in message news:<3D1E07EC...@earthlink.net>...