Radio Direction Finding, good challenge, great fun!
Radio Direction Finding  Building the PA8W Direction Finders > The RDF40 development platform
Who's PA8W > How to locate radio transmitters? > The RDF41 microcontroller based RDF
My Country > Builds by other amateurs > The RDF42 microcontroller based RDF
Frequently Asked Questions > Soft vs hard antenna commutation > The RDF43 microcontroller based RDF
News & changes: > What Radio is suitable? > The RDF43color RDF
RIT student project uses RDF41
> What's a doppler Radio Direction Finder? --------------------------------

> What's an Amplitude Radio Direction Finder? > Some thoughts on Doppler Antenna Arrays
New! MapApp! > Accuracy of a Radio Direction Finder > How to build a mobile VHF doppler array
A radio hunt in short > Elevation measurement > How to build a mobile UHF doppler array
FAQ added > Archives > How to build a fixed site VHF doppler array
RDF43: featuring Gated- Sampling > How to build the old V2,3 doppler > How to build a fixed site VHF / UHF doppler array

> How to build a mobile UHF Amplitude array
> How to build a fixed site UHF Amplitude array
> How to build a 23cm Amplitude array
> MapApp: mapping software for Android
> RDF-Mapper: mapping and networking software
My friend PD0G has put up a shadow website with a lot of content about this subject.
You can find it here:

Note that being a shadow website the content may be a little behind, since changes and additions are first uploaded here..

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