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 DDE is obsolete Dynamic Data Exchange stuff but because my SoundDoppler en GPS are written in it I have to get it working.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