Author Topic: Radio Direction Finding  (Read 122528 times)

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Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #50 on: April 28, 2012, 07:15:56 pm »
Hello Every Body,

I did some sketch for a Super Simple Sound Doppler

with negative voltage for the diodes if you use ordinairy
1n4148 diodes as Pin Switches.

I am trying to build en draw a new PCB in DipTrace to right now.

I did some changes in the outputcircuit to try to softswitch it.


So take a look and give comments.
« Last Edit: May 25, 2012, 06:20:57 pm by PA3BNX »
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #51 on: May 02, 2012, 06:14:16 pm »
Hello Every Body,

Yesterday  I did a radio Veron club demonstration with the Doppler's.

Today I did rebuild the 4 x 1/2 wave Doppler antenna at home and it didn't work okay anymore.

It took me quite some time to find out what was wrong.

But the RVS BNC Chassis had no good contact for RF to the aluminium.
But still the DC contact was good enough to measure voltage drop over the
1n4148 diodes.

It was strange what  happend.

I did wire  the mass to the  solder lug so the RF contact is again okay.

It has to do with corrosion or bad contact
from RVS to aluminum.

Further I did reduce the  4x 100nF C's at the lowpass at the 4001 NOR outputs
to 1nF on the SuperSimpleSoundDoppler circuit.

The not  connected output looks much better on the scoop hi...
The bare 4001 nor outputs are not very happy with just 470 ohm and 100nF as load only.
The Doppler works equally good.


Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline steve_w

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Re: Radio Direction Finding
« Reply #52 on: May 15, 2012, 09:29:37 am »
keep up the good work, I read your posts with interest. 


regards

SW
So long and thanks for all the fish
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #53 on: May 22, 2012, 05:52:30 pm »
Hello Every Body,

Today I did work on my 4 magnetic feet for the car with 1/4 wave monopoles for 2 metres.

They have about 8 cm diameter feet with rubber beneath them.

About 100pf capacity between earth and coax mass.

So I decided to put aluminium foil underneath them and wrap that with a tire wrap around the base clamp.

No or less wrinkles and now I have more then 700pf

So that's a lot better for mobile using.

So try that to if you want to use 4 monopoles on the car.

Remember that good mass or RF earth is needed for good bearings with a Doppler.
« Last Edit: January 10, 2013, 06:53:54 pm by PA3BNX »
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #54 on: June 02, 2012, 05:23:09 pm »
Hello Everybody,

Today I did draw a even more simple  SuperSimpleSoundDoppler circuit
with a 4017


I have not build it yet but I think it can run as well...

It would be easy to make a 3 4 5 or even 8 antenna SuperSimpleSoundCard design now.

Just put the reset line further away and add some more antenna's hi..

Don't forget to change the oscillator frequency accordingly.

I did put to diodes to have a symmetrical block wave to the lowpass filter
for the reference signal with the 4 antenna circuit.

I added a resistor from base to mass at the referency frequency circuit of 100k

Today 6-6-2012
I changed the buffer reference transistor to a collector tapped one so the output is
constant if I Remove or Connect the antenna switcher unit control cable
I got it all working on matrix PCB now.

Time to draw a new PCB layer for boards hi.
« Last Edit: January 10, 2013, 06:54:50 pm by PA3BNX »
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #55 on: June 07, 2012, 04:23:12 pm »
Hello Everybody,

Two pictures of the 4017 SuperSimpleSoundDopplerwith 4017 chip.

It works okay.

I will soon release a new version of SoundDoppler121.exe with improved
to many zerocrossings routines and of cource the new circuit 4017 in it.
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #56 on: June 12, 2012, 05:17:30 pm »
Hello Everybody,


Take a look here:

Balint Seeber 

http://wiki.spench.net/wiki/SDRDF

I made a very simple tool to test very easy the 4 antenna array.

It's just a battery and 4 switches to switch the antennas on.


This makes it easy to test the cable and with a spectrum analyser to check the working
of the antenna Assembly.
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #57 on: June 19, 2012, 09:58:03 am »
Hello Everybody,


Here is a nice link to a modern way of RDF ing !

http://www.narda-sts.de/fileadmin/user_upload/cockpit_ida/literatur/IDA-Brochure_E0288A_02_2012.pdf


I have build the simple test circuit some messages before.

And it's very usefull.

I found in one of my Doppler antenna assembly's a diode
that was not switching off well

I used old diodes from scrap hi .

While the diodes are in series so if one doesn't switch off you don't
notice it so fast.

But I connected my TV tuner spectum analyser to the output cable of the
antenna and sweeps just the local 88-108 MHz on the SA

And very easy I saw that this unit didn't switch off as good as the others do
and I found one diode not being a 1n4148 hi..

After placing it with an other one from scrap it works okay now.

 
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #58 on: June 24, 2012, 05:22:31 pm »
Hello Every Body,



Some body (Michael Schenk) in Germany is using my software for 27 MHz foxhunts




I am working on FT817 Cat control module in MyMapping135.exe at the moment.

Not ready yet but making progress
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #59 on: June 30, 2012, 05:24:27 pm »
Hello every Body,

Today I did some programming to make
an extra form in SoundDoppler122.exe

For test in the Demo2_mode.

A extra button  "Adjust" on inputXY screen

Now I can adjust with a 3 sliders the
amplitude, phase and noise.

Generated internal to test all the software routine's to see if they are all
correct working.

I should have made this earlier hi...

I also removed some bugs in the soundcard driver.

It's also very nice to see how the software is functioning without
having hardware connected.

So soon it will be available on the website of Pi4WAG as SoundDoppler122aAll.zip


 
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #60 on: July 07, 2012, 04:32:50 pm »
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.

 
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #61 on: July 14, 2012, 05:39:17 pm »
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


Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #62 on: August 03, 2012, 07:19:26 pm »
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)
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #63 on: August 20, 2012, 08:57:09 pm »
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

« Last Edit: August 21, 2012, 06:42:01 pm by PA3BNX »
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #64 on: August 28, 2012, 05:28:57 pm »
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

« Last Edit: August 28, 2012, 05:31:23 pm by PA3BNX »
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #65 on: October 12, 2012, 05:13:06 pm »
Hello Every Body,

I have done some building for the 4017 SuperSimpleSoundDoppler.

PA0CVW did some print art work
and I did also some PCB work.

We did this in Paint !

There is a jumper on the board that's used for
3 of 4 monopoles or dipoles Doppler antennas.

So it's also easy to have a 3 antenna direction finding system.

PA8W is working on a 8 antenna Doppler direction finder with soft switching
So we hope to get that working  soon.


So have fun,

There is also a new version SoundDoppler124cAll.zip on the PI4WAG site.

Soon there is version SoundDoppler124eAll.Zip

I added MyMapping137 with Waypoints
And I fixed a Bug in SoundDoppler124 SinCosDetector.
And added a Error message for the referency if something goes wrong
with the hardware connected.

I did build a 4017 SuperSimpleSoundDoppler in a blue PCB box
with speaker.
 

« Last Edit: October 17, 2012, 06:04:21 pm by PA3BNX »
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline Daniel_DB9

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Re: Radio Direction Finding
« Reply #66 on: November 09, 2012, 09:29:11 pm »
Hi Lodewijk!

Thanks for that amazing Software!

In the moment i use a Ramsey-2-Sounddoppler with 4 Dipols.
I builded up a 2x4017 PCB for 12 Antenna-Switcher an 12 Dipols with 2,66m in diameter.
If you wish, i can give some Photos or Layouts in KiCad.

I have a wish for the Sounddoppler-Software, can i start? By the way... of course not now, step by step, if you think it makes a sense.

- KML-Log saves in a day-folder and then in a hour-folder for a defined time period.

Edwin PA7FRN set a test account at his website for me and it works very well!

One Question i still have...

GPS for mobile-use. Can i use any USB-GPS Receiver that emulates a COM-Port?

best regard

Daniel



 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #67 on: November 25, 2012, 06:13:19 pm »
Hello Deniel and others.


I saw that you want to use the DL5DI URL protocol
and you cannot change the URL.

I do not use this myself but I will check the code
and make it possible to change the URL

So here I piece of the subroutine I use.

Code: [Select]
Public Const strcURLdl5di As String = "http://db0myk.prgm.org/peiler.php?"


Public Sub DL5DI2HTTP(ByVal MyDegrees As String, ByVal MyAgrelo As String, Optional bMu As Boolean = False)
 ''ToDo
 ''@26-04-2011
 ''@18-08-2011
 ''@26-08-2011
 
 ''Static string
 Static OldDegrees As String
 ''Const string
 Const RDigits As Integer = 5
 Const p As String = "p1="
 Const d As String = ","
 ''String
 Dim a As String
 Dim MyUrl As String
 
 ''Nothing ToDo
 
 
''Example http://db0myk.prgm.org/peiler.php?p1=52.21667000,5.16666700,25.0,45
 
 
 ''Also check for Callsign
 Select Case strArrayPacket(1)
       Case strNoCall, ""
       bDL5DI = False
       Form1!mnuDL5DI.Checked = bDL5DI
       OldDegrees = ""
       Exit Sub
 End Select
 
 
 ''@14-09-2011
 ''To Many ZeroCrossings or nothing in averaged
 If bMultiDetecting Then ''Never draw if MultipathDetect + Agrelo
  If arrMulti(3) > 1 Or Val(MyDegrees) = cNoDegrees Then
   Exit Sub
  End If
 End If
 
 If bMu Then Exit Sub
 If OldDegrees = MyDegrees Then Exit Sub ''If degrees the same as last time do not send data.
 If Val(MyAgrelo) = 0 Then Exit Sub
 If MyDegrees = strcEmpty Or MyDegrees = "" Then
  OldDegrees = MyDegrees
  Exit Sub
   Else
  OldDegrees = MyDegrees
 End If
 
 MyAgrelo = LTrim$(MyAgrelo)
 
 ''Factor a is the deviation according 2 lines beside the bearing in degrees
 
 Select Case MyAgrelo
  Case "1", "2", "3"
   a = "90"
  Case "4", "5"
   a = "45"
  Case "6", "7"
   a = "22.5"
  Case "8", "9"
   a = "10"
  Case Else
   ''Nothing ToDo
   Exit Sub
 End Select
 
 If bGps Then
  If GPSVal = "A" And Val(GPSKnots) >= Val(strArrayPacket(5)) Then
   MyUrl = strURLdl5di & p & Round(strConv2Decimal(GPSLat), RDigits) & d & Round(strConv2Decimal(GPSLong), RDigits) & d & Val(AddCompassValue(MyDegrees)) & ".0" & d & a
    Else
   Exit Sub
  End If
 End If
   
 If bGps = False Then
  MyUrl = strURLdl5di & p & Round(strConv2Decimal(strArrayPacket(3)), RDigits) & d & Round(strConv2Decimal(strArrayPacket(2)), RDigits) & d & Val(Conv3(MyDegrees)) & ".0" & d & a
 End If
 
 
''Debug.Print MyUrl
Call GotoUrl(MyUrl)
 
End Sub

So here I piece of the subroutine I use.

I will check and try to test these routines and make changing the URL possible where the error is of the URL changing.

Yes I can add also the Quality just tell me how the URL string has to look.

I will do tomorrow some testing and I let you know when the new version
is there.

Currently I was working in MyMapping1.38
To get all the remote and local control functions right for the FT817 through a cat62 cable.

I am also planning to make a station data base in MyMapping139.exe
So know stations with there name location pwr frequency etc.

We are also working on a new PCB design.

Two SuperSimpleSoundDopplers on one eurocard.
« Last Edit: January 10, 2013, 06:48:39 pm by PA3BNX »
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #68 on: November 26, 2012, 06:16:55 pm »
Hello Everybody,


Today I did fixed the DL5DI error

Now you can change the URL

And I changed the URL Line

I added the Quality factor to.

So If you see SoundDoppler126.zip on our sites that's fixed.

I also discoverd a zero crossdetector error in sounddoppler 125

Because some time agar i did improved the SinCos Detector
and i made a mistake with a global variable.
The version 124 en 125 Will only work with zerocrossdetector from 0 to 180 degrees hi.

But Now it's fixed

The new option FM avg average FM audio signal is very good for the
software squelch.

The squelch wont open on short loud bursts in the FM audio noise anymore.

Also has the MyMapping139.exe good working FT817 Cat control with 10 memory channels to.

Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #69 on: December 07, 2012, 08:12:41 pm »
Hello Everybody.


Here I did find something that is of intrest for us

A WirstWatchDF finder

http://wirelessinnov.com/documents/WRISTBANDDFSYSTEMAPRIL122011.pdf

Very Nice

Further the SoundDoppler127aAll.zip software is there

It has better software squelch and in MyMapping it has advanced Waypoints
called Transmitsites.


« Last Edit: December 07, 2012, 08:17:09 pm by PA3BNX »
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #70 on: December 09, 2012, 06:54:54 pm »
Hello every Body,


I thought of a simple way to switch from a VHF to a UHF direction finding
antenna array on the SuperSimpleSoundDoppler connected to a VHF UHF scanner
or receiver with one input antenna connector.


So something like this should do the trick.

Even with cheap print relays.




Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #71 on: December 26, 2012, 09:17:06 pm »
Hello EveryBody,

We have a new SuperSimpleSoundDoppler de Luxe


It does softswitching the antennas

So it has less reciprocal mixing of in band adjacent strong signals.

Easy to build I think

See also

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

If you use 3 diodes like 1n4148 in the dipoles circuit you can raise the 7805 with a si-diode.
or put in a 7806 regulator.



And I am currently working on SoundDoppler129.exe software
to make it running with APRSIS32


APRSIS32 is a very nice APRS software witch is updated regularly.


See some links:

Lynn Deffenbaugh KJ4ERJ
APRSISCE32 You Tube




http://df8ls.de/documents/APRSIS32-Manual.pdf


Passcode requests need to be sent to aprsisce-owner@yahoogroups.com with your name and callsign
« Last Edit: January 13, 2013, 07:55:05 pm by PA3BNX »
Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #72 on: January 01, 2013, 08:09:02 pm »
Happy NewYear2013,


I am stil programming to get SoundDoppler.exe running
together with APRSIS32.exe.

Okay it's going slow but steady.

New version SoundDoppler130All.zip on the PI4WAG site

http://www.pi4wag.nl/index.php/pseudo-doppler-radio-direction-finder


Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #73 on: January 08, 2013, 07:40:21 pm »
Hello EveryBody,

Today I found these two links

Very intresting for every Radio Direction Finder Freak.

The Future of Radio Direction Finding ?

http://www.ni.com/usrp/

On the site of PA8W the new 8 dipole doppler circuits are available

Feed with just one coax to the switcher unit.

Version 3 Doppler
http://members.chello.nl/~w.hofman/pa8w/V3.htm
http://members.chello.nl/~w.hofman/pa8w/DopplerRdfMainDiagram3.htm

I am currently still programming to get sounddoppler.exe running
with APRSIS32.exe

I also have included in the upcoming version a possibility to send
the file packet.txt through the comport to other applications.
And it's full APRS compatible of course.


Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 

Offline PA3BNXTopic starter

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Re: Radio Direction Finding
« Reply #74 on: January 13, 2013, 08:05:48 pm »
Hello EveryBody,

I bought a cheap

USB SoundCard
U-Control UCA202 Behringer.com

It works okay with SoundDoppler on Windows XP

Just one thing it cannot adjust in software the stereo input levels they are fixed.

It needs about 1 volt max So I had to build a small stereo
preamplifier with just 2 bc549 on matrix board.
(uses about 2 MA at 12 volt)

Now it works okay.
And I have two Doppler's running simultaneously running on one PC.

Had to do some tweaking in MyMapping software.

Now I have a cyan arrowpoint if it's doppler1
a yellow arrowpoint if it's doppler2
and magenta arrowpoint if it's  another station.

Further I deciced that the arrow-length must be according the APRS101.PDF protocol spec's
So the next software update Will have these futures.

Happy building, testing and experimenting.

Greetings,

Lodewijk

Credo:

Home brew projects:
Build/Design  with minimum hardware
and maximal software.
 


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