Old CDMA aerials vs nextG

Submitted: Friday, Oct 17, 2008 at 14:01
ThreadID: 62629 Views:2955 Replies:4 FollowUps:13
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Hello all,

I tried a search of the above, but it gave me all the answers except the one that I want.

I have a CDMA 6db antenna, and was curious as to whether it will be compatible with nextG, as my understanding is that nextG uses the same frequency as CDMA.

Thanks in advance
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Reply By: Member - John - Friday, Oct 17, 2008 at 14:04

Friday, Oct 17, 2008 at 14:04
MIke, the next G aerial I have is marked CDMA, so they must be the same. John
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Follow Up By: mike w (WA) - Friday, Oct 17, 2008 at 14:11

Friday, Oct 17, 2008 at 14:11
Excellent, thanks John,

looks like theres an aerial for sale in the trader ;)
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Reply By: David N. - Friday, Oct 17, 2008 at 16:43

Friday, Oct 17, 2008 at 16:43
Yes, definitely the same.
CDMA and NextG(Telstra) are the same. A CDMA antenna is the same as a NextG antenna.

3G (and GSM) is a different frequency.
Cheers
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Follow Up By: Hughd - Friday, Oct 17, 2008 at 17:06

Friday, Oct 17, 2008 at 17:06
At the risk of being a bit picky........ NextG is a 3G service that runs on a number of frequencies. It prefers the CDMA band, but also will operate over GSM bands. What they have done is to take the 3G application service, and run it over a radio mechanism that can select CDMA (for preference) or GSM. It is called UTMS, but Telstra brands it as NextG. By application, they mean connecting calls, transferring data, photos, movies, messages, etc, etc.
Hope that didn't just confuse the issue.....
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Follow Up By: Mike Harding - Friday, Oct 17, 2008 at 17:23

Friday, Oct 17, 2008 at 17:23
Hughd:

you raise a valid point although, I suspect, it will confuse the issue :)

NextG certainly will roam to GSM but given that GSM has a design limitation of 33km an external antenna is of little value in most situations.

I doubt the internal antenna of a NextG phone does anything special when operating GSM, probably just switches in a bit of L or C to maintain a power match.

In short: a CDMA antenna is fine for a NextG phone.

Mike Harding
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Follow Up By: mike w (WA) - Friday, Oct 17, 2008 at 17:27

Friday, Oct 17, 2008 at 17:27
Thanks guys for confusing the issue some more....;)
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Follow Up By: Sand Man (SA) - Friday, Oct 17, 2008 at 21:05

Friday, Oct 17, 2008 at 21:05
Hughd,

At the risk of also being picky, you are not quite correct.

NextG operates on a different frequency to 3G. It has been classed as 3.5G. They are separate networks, operating on different frequencies.

If Telstra's 3.5G network is unavailable, NextG phones will then search for the Terstra GSM network and use that if it is available.

Bill.

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Follow Up By: Member - JohnR (Vic) - Friday, Oct 17, 2008 at 22:58

Friday, Oct 17, 2008 at 22:58
Mike Harding and Sandman Bill are right

The old CDMA was 900 mhz and the new Next G is 850 mhz which is close enough in frequency to use the same antenna.

Many phones are multiband. Some are tri-band some are quad-band. They will look for a system they can use if they can't find Next G. The tri band has three systems and the quad band four. Necessary when touring internationally.

Hugh, I am not sure what you are meaning as the CDMA band IS different to the newer Telstra one.

Interestingly Telecom NZud has made a decision to share the same frequency - 850 mhz according to the paper the other day. They have equivocated on the decision for some years.
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Follow Up By: Boobook2 - Saturday, Oct 18, 2008 at 08:35

Saturday, Oct 18, 2008 at 08:35
CDMA was 850Mhz and had to be shut down to clear the way for Next G which is generally 850Mhz in the country and 2100Mhz in the city. Next G is nothing other than a brand name for Telstra's 3g technology. ( 3 stole the show with their brand and Telstra and Optus had to steer well clear of anything with a 3 in it.)

GSM is 800, 900 and 1800 Mhz depending on the tower and carrier.

A 850Mhz antenna doesn't know or care if it is Next G or CDMA and wont help at all in the city where 2100Mhz is generally used. It won't be very useful for 900 Mhz.
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Reply By: Sand Man (SA) - Friday, Oct 17, 2008 at 18:25

Friday, Oct 17, 2008 at 18:25
CDMA and Next-G operate on the same frequency so your aerial will certainly be suitable.

GSM, although not the same frequency, is close enough that the same aerial will be OK for a GSM phone as well. Much less loss than a through the glass "connection".

Bill.



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Follow Up By: Member - Graham H (QLD) - Friday, Oct 17, 2008 at 18:36

Friday, Oct 17, 2008 at 18:36
Just to confuse the issue a bit more

What about an Optus Next G (eqiv) which operates on 900mhz.

What aerial would you use for that as the Telstra phones dont operate on that frequency.
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Follow Up By: David N. - Friday, Oct 17, 2008 at 20:04

Friday, Oct 17, 2008 at 20:04
Optus would require a GSM antenna, but don't expect any great range.
In fact, off the beaten track Optus are useless.
(I have Telstra NextG AND Optus.)
Cheers
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Reply By: Richard W (NSW) - Friday, Oct 17, 2008 at 19:58

Friday, Oct 17, 2008 at 19:58
Mike,

I'm using my old Mobile One CDMA aerial for the Next G phone and it works fine.
AnswerID: 330402

Follow Up By: Member - Willie , Sydney. - Friday, Oct 17, 2008 at 21:41

Friday, Oct 17, 2008 at 21:41
Mike ,
Me too.
Willie
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Follow Up By: mike w (WA) - Friday, Oct 17, 2008 at 22:02

Friday, Oct 17, 2008 at 22:02
Thanks guys,

not that I myself need it, have given telstra the arse in all respects.

Looking to on sell it, so before I advertised, wanted to make sure that all was correct.

Mike
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Follow Up By: Member - JohnR (Vic) - Friday, Oct 17, 2008 at 23:00

Friday, Oct 17, 2008 at 23:00
Mike, it is ok to do that, give them the arse that is. Just don't expect your phone to operate too far away from populated areas, well not in the near future.
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Follow Up By: Member - Willie , Sydney. - Saturday, Oct 18, 2008 at 07:21

Saturday, Oct 18, 2008 at 07:21
I was going to make the same comment . Willie .
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