Electronics > Projects, Designs, and Technical Stuff

Radio Direction Finding

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PA3BNX:
Hello All,

I worked hard in coding to get the option
of modifying the $GPRMC string working in

my GPS.exe program.

I am still not ready with the DDE link stuff.

DDE is obsolete Dynamic Data Exchange stuff but
because my SoundDoppler en GPS are written in it I have to get it working.

Of cource I also will write this option in my New SoundDopplerNet.exe

But thats not finished / working yet.

I show you here a screen dump af a very intresting and good working

VHF soft-antenna-switcher for the doppler.

That is the datong doppler circuit on two boards.

All signals is done is through 1 coax cable witch does
do the RF, DC-powersupply and Reference for switching the antennas.
Every antenna has a wide band RF amplifier and then the output is fed throug a PIN diode
to the summer.

The advantage is that now you cannot hear in a nearby reciever the commutating
antenna whips acting as reflectors and because ist softswitching
instead of hard switching you can hear less loud stations.

HLA-27b:
Cool job

May I ask what are the pcb sizes and hole locations are you using?
I am currently working on pcb assemblies, holes, fixing arrangements etc, hence my curiosity.

PA3BNX:
Hello All,

Here I post a picture off the Input XYscoop found in SoundDoppler.exe

The upper line is not quite a sinus but a little distorted with
the SuperSimpleSoundDoppler design.

I want some hints how to improve the sinus with minimal extra parts.

and enough output to drive the soundcard line input.

I know my software only detects the zerocrosses to get the frequency and antenna 1 position.
But it looks not nice.
 

PA3BNX:
Hello All,


The PCB sizes of the datong antenna switch are about 10 bij 10 cm

They are put above each other and connected through wit some wires.

I have not made the PCB myself I did have bought some years ago
Just the Prints.


HLA-27b:

--- Quote from: PA3BNX on January 14, 2012, 06:23:10 pm ---The PCB sizes of the datong antenna switch are about 10 bij 10 cm

They are put above each other and connected through wit some wires.

I have not made the PCB myself I did have bought some years ago
Just the Prints.

--- End quote ---


Thank you, 10cm X 10cm seems to be very popular naturally.

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