Electronics > Projects, Designs, and Technical Stuff
Radio Direction Finding
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DDE is obsolete Dynamic Data Exchange stuff but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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