Re: Serial connection for Tungsten E and GPS receiver

Jack Erbes wrote: 
mikelee_314@xxxxxxxxx wrote:

The power consumption of a GPS receiver quite high, compared to
Tungesten-E. Even if the serial conection works, there might be the
problem of how the GPS receiver is being powered.


Isn't this pin there to draw power from the Palm to feed the electronics in the serial side of the cable, and not the connected GPS or PC? Maybe the signal conversion does require some power? I know you can draw power from a PC USB plug, but maybe not from a mini-USB? That would make sense ans this type of connector is used on non-PC devices like PDA's and cameras, where powering the other side makes little sense.

Regarding the GPS, I strongly suspect this would require a null modem between this cable and the GPS cable. I had to build one when I connected my serial cradle to my GPS cable (9-pin null modems are not as common as the 25-pin ones)


--
Luc Le Blanc


The specs for the Altina list power consumption at <80ma at 4.5-5.5V, that is quite a bit less then the Tungsten draws and is typical for those style of receivers.

I have never noticed but I don't think my Tungsten T3 will back feed power to the GPS when the DC-DC adapter does not have power. If I stop and shut the car off the T3 stays on but I think the GPS signal is lost. When I restart the car the GPS warm fixes in 10 seconds or so. If I leave the T3 on (with no external power) it will shut itself off to save battery after 5 minutes.

And I need to correct myself in my earlier post, I said the GPS receivers were 3.6V devices, they actually will run on 4.5-5.5V and can use the same DC power source as the PDAs.

Jack 
.

Relevant Pages

  • Re: Does this sound right? - NEMA question
    ... The GPS "Data Out" line goes directly ... the same screw that GPS power - connects to. ... It sounds like I can expect to hear the GPS talking to the radio in ... When I took over her electronics suite, ...
    (rec.boats.cruising)
  • Re: GPS Power
    ... Note that the rectifier circuit has no regulation - you'd get very high DC voltages at full throttle if you connected it direct to the sled's lighting coil. ... I'm assuming my sled has a regulator to keep voltages to the bulbs down, even though it has no battery - but I'll be taking a run with my meter hooked up so I know what I'm dealing with before taking any risks with my new GPS! ... you can use the original GPS power cord to reduce the voltage to the correct level. ... The GPS unit has flat brass buttons on the back for power in and audio out, and there's no way to make reliable electrical contact without clipping it into a cradle with spring loaded contacts - and the only way to get the right cradle is to buy another car adapter for $$$. ...
    (rec.sport.snowmobiles)
  • Re: iPAQ 210/iPAQ 211 after 1 week of use
    ... Connection via DUN and you will not need to use the "Bluetooth Phone ... It only has one port that can be used for a BT GPS and you can't use the ... If you hold the power button down it will turn itself back on as soon as ...
    (microsoft.public.pocketpc)
  • Re: iPAQ 210/iPAQ 211 after 1 week of use
    ... Connection via DUN and you will not need to use the "Bluetooth Phone ... It only has one port that can be used for a BT GPS and you can't use the ... If you hold the power button down it will turn itself back on as soon as ...
    (microsoft.public.pocketpc)
  • iPAQ 210/iPAQ 211 after 1 week of use
    ... Connection via DUN and you will not need to use the "Bluetooth Phone ... It only has one port that can be used for a BT GPS and you can't use the ... If you hold the power button down it will turn itself back on as soon as ...
    (microsoft.public.pocketpc)