uhf

[jamiejig]

dose a uhf system have grate penetration with it having a low mhz. ie like a 900mhz video link

[papa_lazerous]

More importantly does your computer have a spell check?

[stebbo1986]

Wow!! im sure it does have good penetration being below 900mhz

the higher you go the less penetrtion you get

[tdmodels]

More importantly does your computer have a spell check?

Papa, your posts are really 'great'ing on me  :P

Stebbo -  Yes, the lower the frequency, the better the penetration. Hence the reason submarines use extremely low frequencies (3 to 300Hz!!!)  Of course, other factors then come into play like transmission power and available transmission bit rates etc

[Coyote]

Yes Jamie it does, Dragonlink even worked inside an underground concrete car park

[glambert]

Hello,

Your are right, great penetration.

In the following video, I turn around an 10 century abbey and both the Thomas Scherrer and the 900 MHz video downlink crossed these buildings made with old thick walls...  But distance was maybe only 100 meters.

https://vimeo.com/channels/multicopterpilot/36856866

Cheers

Gregory

[electrotor]

Stebbo -  Yes, the lower the frequency, the better the penetration. Hence the reason submarines use extremely low frequencies (3 to 300Hz!!!)  Of course, other factors then come into play like transmission power and available transmission bit rates etc

Then there's antenna length.
Let's see, for 100Hz ... 300000/100 = 3000km wavelength.
Oh dear, that's a long trailing wire even if you use 1/4 wave.  :o