adaptor for next g antenna

Submitted: Saturday, Jan 02, 2010 at 09:17
ThreadID: 74808 Views:2081 Replies:3 FollowUps:2
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G'day. I have a next g aerial installed on my bullbar for my mobile phone. I've just bought a cb radio and would like to know if I can buy some sort of adaptor so I can run my cb and phone off the antenna at the same time. I also have a patch lead screwed on the end for my mobile. Thanks for your help.
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Reply By: GUJim - Saturday, Jan 02, 2010 at 09:26

Saturday, Jan 02, 2010 at 09:26
Hi Jimmy88.
Your NextG aerial is not suitable for use with either type of CB (27Mhz or UHF) as their operating frequencies are very different to NextG frequencies.

NextG operates at 850Mhz, UHF at 477Mhz and the old type CB's at 27Mhz. Trying to use any of these on an incorrectly matched aerial may damage the output stages of the device.

Sorry, but it looks like you will have to join the rest of us who have an aerial 'farm' on our bull-bars.

AnswerID: 397287

Reply By: Member - joc45 (WA) - Saturday, Jan 02, 2010 at 14:15

Saturday, Jan 02, 2010 at 14:15
Technically, it should be possible to design a dual-band antenna for those bands (one can get mobile phone antennas which operate on the 850-900, 1800 and 2100 bands), especially as there is an approximate 2:1 ratio between the frequencies, but I don't know of a commercially-available antenna for your application. Such an antenna would need to have a decent 'trap' to prevent even small amounts of power from one Tx getting into the other equipment.
Do a google on multi-band antennas with such companies as RFI. Good hunting!
AnswerID: 397310

Follow Up By: Member - Graham H (QLD) - Saturday, Jan 02, 2010 at 17:35

Saturday, Jan 02, 2010 at 17:35
I have the RFI you describe and it is phone only.

Havent seen any CB/GSM as you describe on their site.

477 Doubled is 954 and Optus GSM is 900 so is a bit away from that.

FollowupID: 666174

Follow Up By: Member - joc45 (WA) - Saturday, Jan 02, 2010 at 19:35

Saturday, Jan 02, 2010 at 19:35
Hi Graham,
Agreed, not quite 2:1, but if broadbanded, would prob design up fairly easily. The mobile phone antennas don't exactly have a harmonic relationship with their frequency bands.
I'm sure if there was a good market for one of these, it would have been designed. My radiocom skills were not in antenna design, but I've worked with people who could have designed such a device if the market volume was there.

FollowupID: 666193

Reply By: Boobook2 - Saturday, Jan 02, 2010 at 17:29

Saturday, Jan 02, 2010 at 17:29
Even if you could find an antenna to do all these frequencies, you would need a splitter which would reduce the signal by 3db, almost negating the effect of the antenna i the first place.

You will need 2 good antennas.
AnswerID: 397322

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