Thanks for the feedback James. You' re right about the antenna shot; This video was intended simply as a visual impression of real life performance of the system. As addition to the information on my website. I totally agree that from a youtube perspective the video is really poor in explaining what kind of system is running, but as stated the website was paramount. B.t.w. the used pseudo doppler array is described here: www.paluidsprekers.nl/pa8w/MobileUHFArray.html
+Jonathan G. Westerling Hi Jonathan Westerling (real Dutch name!), Are you allready using doppler RDF's? What types and what do you use them for? Multipath is something you can't really solve, all you can do is make sure the array is very well omnidirectional (depends on commutation methods), otherwise multipath effects would increase. Secondly this RDF40 design uses methods to ignore measurements that are obviously mutilated by multipath. I am still testing and tweaking these algorithms.
sigmounte No, not yet sure if I'll be publishing the plans. This particular model is in development and will be tested for the next 6 months or so. Still refining the detection and suppression of corrupt measurements now.
Hi... i am working on a RDF that should operate in 433 MHz. I am thinking about using pseudo doppler for it, and used your site as a source of information... After reviewing your RDF circuit, I noticed you are working with audio... this audio should come from an FM demodulator... What kind of demodulator you use in yout project? What module? Most modules deal in FSK, but i found just one that deal in FM. Is there a cheap analog FM module that works in UHF?
Hi Luiz, I use a standard narrow band FM communications receiver. So you need an analog output for a doppler rdf. I am not sure if there is a simple module which is suitable.
The used antenna array can be found here: radiodirectionfinding.nl/MobileUHFArray.html
Very impressive. Would have been nice to see a shot of the antennas on your car roof, too.
Thanks for the feedback James. You' re right about the antenna shot; This video was intended simply as a visual impression of real life performance of the system. As addition to the information on my website.
I totally agree that from a youtube perspective the video is really poor in explaining what kind of system is running, but as stated the website was paramount.
B.t.w. the used pseudo doppler array is described here: www.paluidsprekers.nl/pa8w/MobileUHFArray.html
Yes interested in helping test. Lots of multipath here in bay area, and we need a better solution. Thanks!
+Jonathan G. Westerling
Hi Jonathan Westerling (real Dutch name!),
Are you allready using doppler RDF's? What types and what do you use them for?
Multipath is something you can't really solve, all you can do is make sure the array is very well omnidirectional (depends on commutation methods), otherwise multipath effects would increase.
Secondly this RDF40 design uses methods to ignore measurements that are obviously mutilated by multipath.
I am still testing and tweaking these algorithms.
does the final info on how to make it are online ? it look a wonderfull !
sigmounte No, not yet sure if I'll be publishing the plans.
This particular model is in development and will be tested for the next 6 months or so.
Still refining the detection and suppression of corrupt measurements now.
Great
Thanks for sharing
Hi... i am working on a RDF that should operate in 433 MHz. I am thinking about using pseudo doppler for it, and used your site as a source of information...
After reviewing your RDF circuit, I noticed you are working with audio... this audio should come from an FM demodulator...
What kind of demodulator you use in yout project? What module? Most modules deal in FSK, but i found just one that deal in FM. Is there a cheap analog FM module that works in UHF?
Hi Luiz,
I use a standard narrow band FM communications receiver.
So you need an analog output for a doppler rdf. I am not sure if there is a simple module which is suitable.