Blue system antenna
#10
(2016-06-05, 22:37)starlord Wrote: because my place is in the middle of all the others, the next 3 antennas are 40-80km away....

Perfect!  If this was a perfect network, stations would be at that density!  The more, the better!

and you want the lowest signal to noise ratio you can get... so antenna sizes vrs gain and threshold levels is a compromise.
 
The way a lot of us Americas folks built our ferrite antennas, the materials cost difference between a 200mm  and a 300mm  with 7.5mm ferrite core slugs
is less than $2 U.S.  ... a 300 mm materials about  $6 US, depending on how you got your shrink tubing and wire!
We have an American Surplus Parts source where we get 50mm X 7.5mm rods (33 material) for about $0.70 each US depending on quantity + shipping.
You'll see them at many stations in Region 3.  But shipping will be very expensive out of U.S.
The expense isn't really in the materials in this case... but in the time it can take to build.

And wire or coaxial loops probably are even cheaper. 

Now, if you're not building your own antennas... the cost for the Friese ferrite antennas from Blitzortung is quite fair. Very fair.
And the Friese antennas are standardized, so the server knows what delays to expect from a station using those.
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Messages In This Thread
Blue system antenna - by sn74 - 2016-05-10, 10:33
RE: Blue system antenna - by RichoAnd - 2016-05-10, 10:47
RE: Blue system antenna - by sn74 - 2016-05-10, 11:16
RE: Blue system antenna - by DelandeC - 2016-05-10, 15:49
RE: Blue system antenna - by sn74 - 2016-05-12, 10:08
Blue system antenna - by DelandeC - 2016-06-01, 10:32
RE: Blue system antenna - by starlord - 2016-06-03, 19:54
RE: Blue system antenna - by Jorgeminator - 2016-06-03, 21:06
RE: Blue system antenna - by starlord - 2016-06-05, 22:37
RE: Blue system antenna - by cutty - 2016-06-05, 23:57
RE: Blue system antenna - by Tobi - 2016-06-07, 20:46

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