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Thanks for making this public. What's the ballpark BOM cost? Could a directional antenna help with locating RF sources? There's some older work ("WokFi") on

Thanks for making this public. What's the ballpark BOM cost? Could a directional antenna help with locating RF sources? There's some older work ("WokFi") on parabolic antennas for WiFi, https://web.archive.org/web/20140802123553/http://www.usbwifi.orconhosting.net.nz/ https://web.archive.org/web/20140802123553/http://www.usbwif... Here's another circuit design for AD8317, https://g8rwg.uk/articles/noise-meter-ad8317/ https://g8rwg.uk/articles/noise-meter-ad8317/ > The AD8317 module I’m using has the logarithmic slope set to 22mV/dB. I used the output of a Viavi JD785 at different frequencies to check the slope and dynamic range of the device. Linearity and dynamic range at 1GHz and 3.5GHz is good and as expected drops off at 144MHz and 6GHz.

pragmatick 2y ago
> What's the ballpark BOM cost? https://github.com/RamboRogers/rfhunter/blob/master/rfhunter.cpp https://github.com/RamboRogers/rfhunter/blob/master/rfhunter... contains amazon links. About $100 although many of the required components come as packs.
bobmcnamara 2y ago
Generally, directionality is tricky to do handheld over a wide bandwidth. Another approach is a phased rx array, could even be as few as 2 antennas, and from that you get a bearing too.
- amatecha 2y ago
  May I introduce you to: the Log-periodic dipole array antenna[0], allowing quite a broad response range with decent directionality in a single antenna. There's probably a practical limit to just how broadband you can make one, but just from a quick search I found one commercially-available antenna[1] that covers 120mhz-2.5ghz, for example. [0] https://en.wikipedia.org/wiki/Log-periodic_antenna https://en.wikipedia.org/wiki/Log-periodic_antenna [1] https://ara-inc.com/product/lpd-tactical/ https://ara-inc.com/product/lpd-tactical/
  - bobmcnamara 2y ago
    Didn't read it, but it's going to be poor directivity for that meager bandwidth. If you're going to go with that wide of a beam why not use a single element and wave it around? I should also mention the third trade off, size, plays into this tool.

pragmatick 2y ago

> What's the ballpark BOM cost? https://github.com/RamboRogers/rfhunter/blob/master/rfhunter.cpp https://github.com/RamboRogers/rfhunter/blob/master/rfhunter... contains amazon links. About $100 although many of the required components come as packs.

bobmcnamara 2y ago

Generally, directionality is tricky to do handheld over a wide bandwidth. Another approach is a phased rx array, could even be as few as 2 antennas, and from that you get a bearing too.

amatecha 2y ago
May I introduce you to: the Log-periodic dipole array antenna[0], allowing quite a broad response range with decent directionality in a single antenna. There's probably a practical limit to just how broadband you can make one, but just from a quick search I found one commercially-available antenna[1] that covers 120mhz-2.5ghz, for example. [0] https://en.wikipedia.org/wiki/Log-periodic_antenna https://en.wikipedia.org/wiki/Log-periodic_antenna [1] https://ara-inc.com/product/lpd-tactical/ https://ara-inc.com/product/lpd-tactical/
- bobmcnamara 2y ago
  Didn't read it, but it's going to be poor directivity for that meager bandwidth. If you're going to go with that wide of a beam why not use a single element and wave it around? I should also mention the third trade off, size, plays into this tool.