Car external antenna/aerial question

Jonc · Occasional Visitor Joined: Sep 12, 2004 Posts: 34

I have a Dell Axim X30 with Tomtom 3, a Dell BT-309 Bluetooth gps internal reciever which I believe is made by Globalsat, due to the tall buildings in London I would like to try an external magnetic aerial/antenna, does anyone know who sells them in the UK.

Thanks in advance

John

linknet · Frequent Visitor Joined: May 05, 2005 Posts: 872

If you mean a re-radiating antenna try here:

http://www.gpsbitz.co.uk/gpsbitz_store/view_product.php?product=ANT3&PHPSESSID=fa87d822531180dba6e2c5c3645a50da

Roger

iancjc · Posted: Wed Jul 06, 2005 9:28 pm Post subject:

does the gps have an external antenna socket?

if it does it will take an mmcx or an mcx antenna - global positioning systems sell them or there are normally some on ebay or most other gps suppliers.

I have a globalsat cf gps - I keep it in the car as a spare and it has an mmcx when connected and put on the top of car it adds 3 or 4 extra sats - mag mount (and strong enough to survive car washes etc - if you forget).

Any make will do - haicom ones are pretty common. - cost no more than 15 - 20 quid.

Ian
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TyTn II (WM6.1) / tomtom one v2
TTN6.03 tomtom 7.xx (one)

Jonc · Occasional Visitor Joined: Sep 12, 2004 Posts: 34

iancjc · Posted: Wed Jul 06, 2005 11:36 pm Post subject:

size........ mmcx is the smaller - approx 2mm "hole".

it looks like you need an mmcx antenna - the haicom ones from globalpositioingsystems will work ok (provided the posting below is correct).

the specs for your gps are below (from a posting on aximsite)

3. System Specification
Electrical Characteristics (Receiver)
Frequency L1, 1575.42 MHz
C/A Code 1.023 MHz chip rate
Channels 12
Sensitivity -170 dBW
Accuracy
Position Horizontal 15m 2D RMS (SA off)
WAAS enabled 10m 2D RMS (SA off)
Time 1 micro-second synchronized to GPS time
Velocity 0.1m/sec 95% (SA off)
Datum
Datum WGS-84
Acquisition Rate
Hot start 8 sec., average (with ephemeris and almanac valid)
Warm start 38 sec., average (with almanac but not ephemeris)
Cold start 45 sec., average (neither almanac nor ephemeris)
Reacquisition 0.1 sec. average (interruption recovery time)
Protocol
GPS Output Data NMEA 0183 protocol, and supports command:
GGA, GSA, GSV, RMC, VTG, GLL (VTG and GLL
are optional)
GPS transfer rate 38400,N,8,1
Dynamic Condition
Acceleration Limit Less than 4g
Altitude Limit 18,000 meters (60,000 feet) max.
Velocity Limit 515 meters/sec. (1,000 knots) max.
Jerk Limit 20 m/sec**3
External antenna
Power 3.3V
Connector MMCX
Power
Voltage Built-in rechargeable battery(900 mAh) and 5V DC
input charging circuit
Operation Time 8 hr. After fully recharged, in continuous mode
>10 hr in trickle power mode
Physical Characteristics
Dimension 85mm x 47mm x 26mm
Weight 98g
Temperature
Operating -20°~ 70°C
Storage -30°~ 80°C
Humidity Up to 95% non-condensing
3.1 Bluetooth Specification
? Bluetooth V1.1 Compliant
? Supply Voltage : 2.8V ~ 3.3V
? Frequency Range : 2.402 ~ 2.480 GHz
? Receiver Sensitivity : -80 dBm
? Transmit Power : Class 2
? Transmitting Range : 3 ~10 m (Depends on environment)
? Power Consumption : 45 mA (Typical)
_________________
-----------------------------------------------------------
TyTn II (WM6.1) / tomtom one v2
TTN6.03 tomtom 7.xx (one)

Jonc · Occasional Visitor Joined: Sep 12, 2004 Posts: 34

Thanks for help ordering one tomorrow.

John

Jonc · Occasional Visitor Joined: Sep 12, 2004 Posts: 34

Had it delivered today it has made a big difference.

John

iancjc · Posted: Thu Jul 14, 2005 3:32 pm Post subject:

good news.

I have one on the roof of my car and my bt gps is hidden away in a storage area of the boot - connected to a power socket - I regukary get 11 sats locked on.

oine thing to watch - if you plug and unplug regularly the connectors don't last long ( I always carry a spare)

Ian
_________________
-----------------------------------------------------------
TyTn II (WM6.1) / tomtom one v2
TTN6.03 tomtom 7.xx (one)

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