GSM/WCDMA car antennas

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Simon Templar - 24 Aug 2005 15:54 GMT

OK, here's an interesting problem. I am hopefully getting the Nokia
CR-27 cradle for my Nokia 6680 phone soon. I have hunted all over eBay
and Google to look for suitable antennas for 3G and have found nothing!

It is obvious that a single 900/1800/2100 is not really possible. So
the obvious option is a duplexer, GSM antenna and a 3G antenna.

Well the GSM antenna isn't a problem they are a dime a dozen.

But what about a duplexer and a 3G on glass or NMO base antenna that can
be easily mounted on a vehicle? I have not seen either of these items
while searching the net.

Anyone got any suggestions?

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John Henderson - 24 Aug 2005 22:28 GMT

> OK, here's an interesting problem. I am hopefully getting the
> Nokia CR-27 cradle for my Nokia 6680 phone soon. I have
[quoted text clipped - 12 lines]
>
> Anyone got any suggestions?

http://tinyurl.com/b7xqu

John

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Simon Templar - 25 Aug 2005 02:03 GMT

>>OK, here's an interesting problem. I am hopefully getting the
>>Nokia CR-27 cradle for my Nokia 6680 phone soon. I have
[quoted text clipped - 16 lines]
>
> John

Great stuff, thanks John. I'd say that would have several antennas
hidden within it and will save hassles of two antennas and a duplexer.

I will see what cost is involved next.

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John Henderson - 25 Aug 2005 09:34 GMT

> I will see what cost is involved next.

Not 100% sure, but looks like it at $47 from
http://www.sunshinecomputers.com.au (under brand RFI).

I bought the CDMA and dual-band GSM version for about $30 a
couple of years ago from "Phonies" in Belconnen Mall, ACT.

John

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Simon Templar - 25 Aug 2005 09:51 GMT

>>I will see what cost is involved next.
>
[quoted text clipped - 5 lines]
>
> John

Thanks John, that sounds like a very reasonable price.

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Donald Newcomb - 25 Aug 2005 02:58 GMT

> It is obvious that a single 900/1800/2100 is not really possible.

Why not? I think they are called "discone" antennas. You can make one out of
a metal funnel and the top cut out of a soup can.

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Donald Newcomb
DRNewcomb (at) attglobal (dot) net

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Simon Templar - 25 Aug 2005 09:49 GMT

>>It is obvious that a single 900/1800/2100 is not really possible.
>
> Why not? I think they are called "discone" antennas. You can make one out of
> a metal funnel and the top cut out of a soup can.

Hehehe, yeh right Donald. I wonder how that would travel on the car
roof at 100 km/h? :)

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Donald Newcomb - 25 Aug 2005 11:06 GMT

> Hehehe, yeh right Donald. I wonder how that would travel on the car
> roof at 100 km/h? :)

That wasn't a stated requirement of the initial request. But since you
mention it, UHF discones would present very little wind resistance. It's
just an upward pointing metal cone with a flat metal disc mounted
horizontally on the point. They really are not very good antennas. Their
primary claim to fame is that they are very low Q and flat over a huge range
of frequencies. Very popular with the military.

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Donald Newcomb
DRNewcomb (at) attglobal (dot) net

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Simon Templar - 25 Aug 2005 11:15 GMT

>>Hehehe, yeh right Donald. I wonder how that would travel on the car
>>roof at 100 km/h? :)
[quoted text clipped - 5 lines]
> primary claim to fame is that they are very low Q and flat over a huge range
> of frequencies. Very popular with the military.

Thanks Donald, yep I have seen numerous pictures of Military comms using
discones.

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