Re: [EE]:: RF Attenuation in Foliage

On Thu, Mar 12, 2026, 2:42 PM David VanHorn <[email protected]> wrote:

> The krakenRf is pretty interesting.  Not a pseudo doppler.
>

Home | KrakenRF https://share.google/TVrj33ovh3ZtyfY2g

That's interesting and scary.
It shows how advanced transmitter location techniques must be "in other
applications" .

Transmit once.
Briefly.
Move very fast

      Russell


> On Wed, Mar 11, 2026, 9:22 AM RussellMc <[email protected]> wrote:
>
>> My Stack Exchange answer re RF Attenuation in Foliage
>> Properly formatted answer here
>> <https://electronics.stackexchange.com/a/766820/3288>
>> (https://electronics.stackexchange.com/a/766820/3288)
>>
>> Also pasted below.
>> Main value is (probably) in the two ancient papes 1965 and 1978
>> Some other links also of possible interest.
>>
>> zzzzzzzzzzzzzzzzzz
>>
>> LORA websearch <https://tinyurl.com/LORARF>
>> LORA images with links to web pages here <https://tinyurl.com/LORARF2>
>>
>> Best frequencies for foliage penetration web search
>> <
>> https://www.google.com/search?q=what+rf+frequencies+best+penetrate+foliage%3F&rlz=1C1ONGR_enNZ1148NZ1149&oq=what+rf+frequencies+best+penetrate+foliage%3F&gs_lcrp=EgZjaHJvbWUyBggAEEUYOTIHCAEQIRigATIHCAIQIRigATIHCAMQIRigATIHCAQQIRiPAjIHCAUQIRiPAtIBCTExNzQyajBqNKgCALACAQ&sourceid=chrome&ie=UTF-8
>> >
>>
>>
>> US military report which is both helpful and confusing - see fig 1 and 2.
>> Main useful point is that the lower the frequency the better (probably)
>> the
>> results.
>> Here
>> <
>> https://web.archive.org/web/20090524205748/http://stinet.dtic.mil/cgi-bin/GetTRDoc?AD=ADA055391&Location=U2&doc=GetTRDoc.pdf
>> >
>> 1978!
>>
>> Older still Here <https://apps.dtic.mil/sti/tr/pdf/AD0648859.pdf> 1965
>> report - "The jungle as a communications network" (sounds good :-) ) MAY
>> be
>> useful. See fig 1 and 2 .
>> "mc/s" in key = MHz.
>> A key point is that at short distances 2 MHz is much better than eg 100
>> MHz
>> but as range increases difference decreases.
>>
>> _________________________________
>>
>> **hcheung provided these references in a comment**
>>
>> A Guide to Wildlife Tracking Technologies
>> <
>> https://wildlifeactinnovations.com/wp-content/uploads/2021/05/A-Guide-to-Wildlife-Tracking-Technologies.pdf
>> >
>>   -
>> 37 pages
>>
>> History of wildlife tracking technology - wikipedia
>> <https://wiki2.org/en/History_of_wildlife_tracking_technology>
>>
>> Direction finding <https://wiki2.org/en/Direction_finding>  wikipedia
>>
>> An introduction to directionj finding methodologies
>> <
>> https://cdn.rohde-schwarz.com/am/us/campaigns_2/a_d/Intro-to-direction-finding-methodologies.pdf
>> >
>> Rohde & Schwarz - 26 pages
>>
>> Charts from olde papers.
>>
>> https://i.sstatic.net/5Kauw6HO.png
>> https://i.sstatic.net/Ol8ZGZL1.png
>>
>>
>>
-- 
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
https://mailman.mit.edu/mailman/listinfo/piclist