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Radio Direction Finding

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PA3BNX:
Hello Every Body,

Subject: 12 Volt power supply in car for Doppler Fox Hunting
-----------------------------------------------------------

I made a 12 volt connection box for all 12 volt connections
if you are going to fox (balloon) car hunting.

Most cars have just 1 cigarette connector.

(You can buy adapters from 1 to 2 or 3 cigarette jacks.
They are not fused separate and also have the problem of
bad contacts while driving)

Many cigarette plugs have the property to
fall out (Bad contact !) if you start driving.

That can be funest if you have more devices connected
to cigarette jacks and the devices are in between connected
with other cables.

That's why I suggest to feed all devices from 1 cigarette jack.

All the min connections are centered around the
device with draws the most current (The LapTop)


You have to connect to the car 12 Volt supply:

1: Laptop
2: Portophone/Scanner
3: Gps Rx (track Garmin)
4: SuperSimpleSoundDoppler

(All my powersupply cords have 4mm  plugs
also easy for use in the shack)

I did put a switch 4x red and 4x black 4mm  jacks and
4 leds on a Small plastic box with a power cord with
a cigarette connector.

The on/off switch makes it easy to plug in the
4mm plugs and check if all okay and then switch on.

The leds are very handy to see if all fuses are okay inside the box.

It's easy to make a mistake that's why there are inside
fuses on plus and minus lines.

There is also a reverse protection diode that blows the main fuses.

The Laptop uses the most current so that's fused at 4 Amps

and the other devices are connected after this connection.

Maybe it looks an overkill to fuse all bana's separate
but I know that it is necessary.

Faults are made easy in the field hi..

Put also some text on the box where to connect the devices
because they are fused differently.

The Laptop will draw the most power.
Connect that to the 4mm jacks direct after the switch and fuses
Also this tries to avoid groundloops as much as possible with 1 powersupply source.
because all the other divices are connected from this powersupply point.

Hint: Put some spare fuses inside the box.

There is a new SoundDoppler123All.zip on the site of PI4WAG with
improved zerocross detector.

 

PA3BNX:
Hello Every Body,


PA8W has some new PCB layouts etc from his Autonome Doppler

Very nice.


http://members.chello.nl/~w.hofman/pa8w/BuildingTheRDF.htm


PA3BNX:
Hello Every Body,


I am building the PA8W 32 led Doppler now from the
PA8W site..

No microcontroller just cheap Cmos IC's..



PCB's look good.

I also did some programming stuff in the SoundDoppler Software.


So take a look at our club site PI4WAG and the site from PA8W.

(There are new drawings etc to there and you can order the PCB's)

PA3BNX:
Hello Every Body,

I will soon update a new version op SoundDoppler
and my new advances in Radio Direction Finding.

I have really made nice futures in the newer software.

Nice demonstration of DopplerSystems

Dough Havenhill of Doppler Systems

PA3BNX:
Hello EveryBody,

Here I show photos of my new build
autonomedoppler design pa8w.

 http://members.chello.nl/~w.hofman/pa8w/dopplerRDF.htm

Upper side the pelorus and pot meterpanel
can opened by 4 hinges
en just 3 m3 screws.

The bottom is also hinged and closed with one m3

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