cdma aerials

Submitted: Saturday, Dec 18, 2004 at 23:25
ThreadID: 18687 Views:2946 Replies:3 FollowUps:8
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Q: Is it possible to have two cdma aerials, such as a 6db bull bar mount and say a 3db glass mount and be able to switch between the two depending on conditions with a switch inside the cabin to give the best of both worlds. Or is it not worth it and purchase an RfI cd-1795 6db seems to be very popular.

Woundering if anyone has purchased from Powertec telecommunications their truck spring 584-cdma 9db gain aerial, (1.1m) and is it any good?

Thanks for any help
Rob
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Reply By: Member - Captain (WA) - Saturday, Dec 18, 2004 at 23:50

Saturday, Dec 18, 2004 at 23:50
Hi Rob

Not sure what you are trying to have "the best of both worlds" of? The only advantage of the glass mounts are their small size. If you are going to mount a broomstick on your bullbar, I do not see any advantage in ever using the glassmount.

By the way, I have the RFI CD 1795 GSM/CDMA antenae and can vouch for its great perfomance.

Mobile one have recently bought out a 2.1m CDMA antenae, I haven't tried it but heard about it when I recently bought the 2.1m 7.5dba UHF antenae (which works a treat). Was thinking of getting the 2.1m CDMA to match the UHF but since I get such good range from the RFI 1795, cannot justify the $$$.

Cheers

Captain
AnswerID: 89422

Follow Up By: Member - Willie , Epping .Syd. - Sunday, Dec 19, 2004 at 12:49

Sunday, Dec 19, 2004 at 12:49
Hi Captain ,
What phone and what in car kit are you using ? Does it have an in car kit with a solid link to the aerial or does it have the proximity type connection.
I am just about to dice my Vodafone setup and go CDMA with Telstra .
Thanks a lot ,
Willie .
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FollowupID: 348321

Follow Up By: Member - Captain (WA) - Sunday, Dec 19, 2004 at 13:07

Sunday, Dec 19, 2004 at 13:07
Hi Willie,

I have the Nokia 6225 with Nokia car kit. It has the proximity connection, not a direct connection. I was a bit sus about this after having a Kyrocera with proper connection. However on a recent trip my Nokia significantly outperformed a mates older Nokia with "proper" connection. Previously we both thought his phone would have better range than mine, but I was in range up to 20 kms earlier than him - a big suprise.

The CDMA coverage is SO much better than GSM in the country, definetly advise anyone here to go for it. The only disadvantage is that there is not as much choice of phone types, but maybe this just reduces the confusion when choosing a phone!

Telstra has the only CDMA network in the West, not too sure about the rest of Oz (you have some mob called Orange somewhere?). So, it doesn't really matter which network you go with as you end up with Telstra in the end. Just shop around and get the best deal. My Kyrocera was with Optus, but always came up with the Telstra logo when you turned the phone on.

Cheers

Captain
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FollowupID: 348323

Follow Up By: Member - Willie , Epping .Syd. - Sunday, Dec 19, 2004 at 13:16

Sunday, Dec 19, 2004 at 13:16
Captain ,
That is great news a s I was looking at the Nokia 6225 on Friday , but thought I had better check on the forum to see how it performed before I made the plunge .
I need to get an antenae but I dont want one as long as 2.1 metres . If I can get one around one to one and a half metres it would be good .
Thanks ,
Willie .
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FollowupID: 348324

Follow Up By: Rob/D.Plain - Sunday, Dec 19, 2004 at 13:54

Sunday, Dec 19, 2004 at 13:54
Captain,
I live in the Vic high country and my basic understanding is that with a 3-4db gain it will give beter saturation for in the hills and say 6-9 db gain will give great distance in open country. At the end of the day I supose I need a good alrounder which the RFI cd 1795 might be best. I to have the nokia 6225 and am glad your impressed with the proformance of your kit.
What would you say the differance is in range roughly, now that you have the in car kit as to the phone alone?

Thanks for your reply
Rob
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FollowupID: 348329

Follow Up By: Member - Captain (WA) - Sunday, Dec 19, 2004 at 19:44

Sunday, Dec 19, 2004 at 19:44
Hi Rob,

All things being equal, a 3db antena has a more "ball" shaped range wheras a 6db has a "squashed ball" hence further penetration around the perimeter but less if the antenae is not horizontal.

If you were comparing a 3db broomstick with a 6db broomstick, both the same length and mounted the same way then yes, the 3db "should" perform better in hills. However, comparing a glass mount to a broomstick, the broomstick will win every time regardless of db rating. Now if you put the glass mount on a 1m pole, then you "may" have an advantage in the hills, but kinda defeats the purpose. The CD 1795 6db broomstick is a great all rounder, not worth swapping and changing IMHO (would be a good choice for you Willie, its only 860mm tall including spring and its the same height as my roofline when mounted on the bullbar - a great test for low branches)

As for the difference the car kit makes, its chalk and cheese!!! The best example is when in my garage (double brick, concrete slab roof and roller door down) my Nokia mobile has only 1 bar signal strength (my Kyrocera had none but still in range). When I put the phone in the car kit, it goes to maximum strength.

I was recently ~90 kms on the south western side of Coolgardie in the middle of the bush (very flat terrain) when I came into CDMA range. Not sure where the tower actually was, but I was happy to be in CDMA range that far out.

I would "estimate" the car kit at minimum doubles or triples the range of a CDMA phone compared to on its own. Even more if comparing while driving (ie not standing on the bullbar trying to maximise reception of the handheld).

Note that the above is my real world experience, technical specs "may" not necessarily agree, but its what I have found.

Cheers

Captain
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FollowupID: 348359

Follow Up By: Member - Willie , Epping .Syd. - Monday, Dec 20, 2004 at 11:55

Monday, Dec 20, 2004 at 11:55
Hi Captain - me again !
Re : the CD1795 6db antenae .
What is the brand of this model and what sort of shops sell these . I will get one for sure with my Nokia and the kit . I just have to figure out which package to go on with Telstra or if I should buy the phone etc outright and go for prepaid . I use the phone only a very smalll amount , but I am toying with the idea of downloading stock exchange website updates when I am off barra fishing in April .
Thanks a lot ,
Willie
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FollowupID: 348413

Follow Up By: Member - Captain (WA) - Monday, Dec 20, 2004 at 15:10

Monday, Dec 20, 2004 at 15:10
Hi Willie

The CD 1795 is made by RFI. I tried doing a quick net search but came up blank (didn't spend too much time though!). Mine came with my car kit as supplied, didn't really have a choice but was what the phone guy recommended and must admit it was a good choice.

Cheers

Captain
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FollowupID: 348429

Follow Up By: Member - Willie , Epping .Syd. - Monday, Dec 20, 2004 at 16:14

Monday, Dec 20, 2004 at 16:14
Captain,
Thanks . Found phone no for RFI on earlier post and will ring them now .
Cheers ,
Willie.
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FollowupID: 348434

Reply By: Rob/D.Plain - Sunday, Dec 19, 2004 at 19:57

Sunday, Dec 19, 2004 at 19:57
Captain,
Thanks for your reply, will look into getting the rfi.
Cheers Rob
AnswerID: 89479

Reply By: Flash - Monday, Dec 20, 2004 at 07:33

Monday, Dec 20, 2004 at 07:33
I've had outstanding results with high gain (7Db) antenna in hilly country recently.
If way off vertical and I want to use the phone, I have on a couple of occasions pulled the antenna vertical with a bit of blind cord (ie: bent the spring).
Works for me- I've had coverage with my phone (Kyocera) WAY WAY beyond Telstra's advertised coverage areas.
Cheers
AnswerID: 89525

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