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Pocket GPS World :: View topic - External Antenna for Navman TMC Module?
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External Antenna for Navman TMC Module?
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Dustysworld
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PostPosted: Thu Apr 19, 2007 8:26 am    Post subject: Reply with quote

I have the garmin connection too . and the mag mount. Signal has not dropped once with this combination
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roked
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PostPosted: Wed Apr 25, 2007 12:27 am    Post subject: Reply with quote

I was just about to buy this when luckily I saw this post. Unfortunatly I tend to switch between a number of cars with work and wanted to use the traffic module with my N40i. Anyone know is there a decent more portable alternative to be had that would be as good as the magmount solution on here?

Edit :- Actually I think I might have misunderstood the solution on here, can I just quickly attach and detach the mag mount and presumably just run the cable out the seal in the car door?
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mikealder
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PostPosted: Wed Apr 25, 2007 7:08 am    Post subject: Reply with quote

You can simply run the mini-scan wire out through a door seal and it provides an effective quick release aerial that can move between vehicles. Its frequency band is not ideal as Classic FM transmit using a frequency around 101 MHz, this is right at the bottom of the mini-scans band, a normal car aerial would be better but they don't come with a mag mount. Worth a try to be honest as the quick release aspect is what you need. - Mike
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GPS_fan
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PostPosted: Wed Apr 25, 2007 8:45 am    Post subject: Reply with quote

Does this mag mount need a 12V supply?

Having looked at the Maplin part number suggested (QT30H), I don't think so, but could somebody please confirm.
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GPS_fan
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PostPosted: Wed Apr 25, 2007 9:16 am    Post subject: Reply with quote

mikealder wrote:
Its frequency band is not ideal as Classic FM transmit using a frequency around 101 MHz, this is right at the bottom of the mini-scans band, a normal car aerial would be better but they don't come with a mag mount.


If Classic FM reception is a problem with the miniscan, Maplin do another mag mount antenna (QT33L) for a few pounds more (19.99 instead of 14.99) and this has a fequency range of 25-2000MHz (rather than 100-1300MHz) - would/could this solve the problem?
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Tim Buxton
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PostPosted: Wed Apr 25, 2007 10:56 am    Post subject: Reply with quote

GPS_fan wrote:
Does this mag mount need a 12V supply?

Having looked at the Maplin part number suggested (QT30H), I don't think so, but could somebody please confirm.

No, no supply required.
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GPS_fan
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PostPosted: Wed Apr 25, 2007 11:16 am    Post subject: Reply with quote

There are a few mag mount aerials listed in Maplin -

QT30H 100-1300MHz 14.99

QT33L 25-2000MHz 19.99

A00GC 70-1000MHz 23.99


Any recommendations gratefully received
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Tim Buxton
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PostPosted: Wed Apr 25, 2007 11:32 am    Post subject: Reply with quote

GPS_fan wrote:
There are a few mag mount aerials listed in Maplin -

QT30H 100-1300MHz 14.99

QT33L 25-2000MHz 19.99

A00GC 70-1000MHz 23.99


Any recommendations gratefully received

I have the QT30H. Considering that Classic FM broadcasts between 99.9 and 101.9 MHz, I think this is enough. They actually show 100-102MHz on their website; has this changed, I wonder?

Mind you, my son would love it if I got the QT33L!
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GPS_fan
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PostPosted: Wed Apr 25, 2007 12:30 pm    Post subject: Reply with quote

Tim,

Thanks for your input.

I'll give it a try - I've previously tried a glass mount 'amplified' aerial, but reception with that was worse than the shoestring aerial.

I guess that I could possibly even get the best of both worlds by connecting the feed from a mag mount into the amplifier if the glass mount aerial and get an amplified feed from the mag mount
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philpugh
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PostPosted: Wed Apr 25, 2007 2:09 pm    Post subject: Reply with quote

GPS_fan wrote:
Tim,

Thanks for your input.

I'll give it a try - I've previously tried a glass mount 'amplified' aerial, but reception with that was worse than the shoestring aerial.

I guess that I could possibly even get the best of both worlds by connecting the feed from a mag mount into the amplifier if the glass mount aerial and get an amplified feed from the mag mount


Not really suprised there. Glassmount aerials are designed for much higher frequencies than FM (eg mobile phones, GPS re-radiating aerials and the like)
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GPS_fan
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PostPosted: Wed Apr 25, 2007 2:18 pm    Post subject: Reply with quote

Well, not really Phil, this is supposed to be for use with car radios and pick up the usual frequencies - not a glass mount mobile phone aerial
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philpugh
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PostPosted: Wed Apr 25, 2007 3:20 pm    Post subject: Reply with quote

But they (glass mount aerials) do work much more efficiently at higher frequencies. It's down to physical size - for lower frequencies they need to be bigger.

The best solution is to have a correctly designed FM aerial (about 1.5 metres in length) external to the car and connected to the TMC unit directly by wire.
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mikealder
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PostPosted: Wed Apr 25, 2007 5:03 pm    Post subject: Reply with quote

I will try the strange looking aerial out, as it should offer slightly better performance than the mini-scan which does work, its a question as to how much more performance the sky scan offers.
As for a decent aerial for TMC I use a Hirschmann unit, amplified internally and it provides GPS, Mobile phone and AM/ FM the downside is drilling holes in the car (not a problem for me) and the high cost. Why try the Sky Scan? - well I drive a lot of hire cars where the Hirschmann is of no use sat on the Ovlov in the car park at work.
Local Maplins have one in stock as well as a solar powered charger for GPS/ phones and PDA's that I want to try - watch this space for an update - Mike
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GPS_fan
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PostPosted: Wed Apr 25, 2007 7:32 pm    Post subject: Reply with quote

Thanks for the update Mike.

Your poor car must look like a pincushion by now with all those holes drilled in it.

Did you have to drill a big hole in the footwell to let the water out?? Laughing Out Loud

Maybe I'll hold fire on buying a mag mount aerial until you've had a little play and let us know how you get on.
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mikealder
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PostPosted: Wed Apr 25, 2007 7:52 pm    Post subject: Reply with quote

I just need the connector addaptors now to try it out, yes the car does have a number of holes in the roof, four GPS receivers, and a couple of FM aerials as well as the Hirschmann (23 holes in total to be exact), no water leaks though - I make sure I fit them correctly Wink - wait and see what happens once I plug it in, then we will know if the Sky Scan or Mini Scan performs best (signal strength meter might help here) - Mike
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