| Electronics > Projects, Designs, and Technical Stuff |
| Radio Direction Finding |
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| EA4FRD:
Dear PA3BNX, Thanks for your photos and information. In case I decided to use the loop antennas what electronic should I use too? Should I use your software too? Thanks again. Best regards. Carlos. |
| PA3BNX:
Hello Everybody, Q Codes that can be used with fox hunting I think. For 27MC you create a ring of 50cm with 10mm tube or outer shield of rg213 with two cuts opposite each other. One end you connect to the the coax to rx and the other cut you put a resistor of about 330 Ohm. If you use copper wire for the ring of 2.5mm2 then better use 470 ohm. There is one sharp minimum in the direction of the resistor. The other site gives one maximum. Use good shielded coax. Remember the antenna does not have much gain but is quite uni-directional I would make a 1:5 HF transformer that also is galvanic separated for the coax to match all. See US2247743 for patent info. See example R&S eb100 You can use my SoundDoppler software with the Aperiodic Cross loop + sens antenne circuit if you want to hunt sofisticated hi... Happy experimenting Agilent TDOA around London Demonstration. |
| oe6rke:
Dear PA3BNX, can you please lower the reference inital frequency border from 200 to 100 Hz? I rebuild the DO2SFD attiny board and noticed that the sine frequency is about 134 Hz. Would be a great help if you can apply this Change. thanks for the great Software,br Robert |
| PA3BNX:
Hello EveryBody I ran over this site very nice high tech Yagi thunts. I am working now on MyMapping 1.52 Witch will have a manual bearing input screen. Okay in the next version the lower frequency of the referency range wil be lowerd to 100 Hz.. This might also be a nice cheap easy TDOA for 27 MHz Hunters. http://www.fewo-line.de/dl4lbd/DUO1_W20.htm |
| PA3BNX:
Hello Every Body, There is a new version SoundDoppler149cAll.zip on the PI4WAG site now That has a new MyMapping 1.53 in it It has a Opacity pelorus and some very nice manual input futures... The Agrelo GPS input through Comport has lots of improvement's It should work quite okay now with PicoDopp and VE2EMM and VRZA 2011 dopplers We are working on a new doppler on a arduino board based platform What also spit out Agrelo Formats' Agrelo is the format to transfer Doppler data over RS232 / USB Like %xxx/q<cr>< lf> |
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