TopBand: Again on beverage!

scaroni scaroni" <
Mon, 15 Mar 1999 14:48:19 +0100

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Hi to all,
here same news about receiving antennas and same questions.
So, like many of you know i like to check the ability to improve the S/N
of receiving antennas, finding wich is the performance of all the last 
project discussed here.
Now i have in my field, an EWE, the shielded phased loops, one beverage, 
a magnetic loop, plus the trasmitting slooping dipole, all on the North 
America, and soon i'll put a K9AY.
So, wich is the problem??
The problem is that year after year, the local noise is increasing, and 
exatly at 310=B0 there is a local noise that i receive on all my antenna
sistem, it is shure a local noise, and on the beverage is really strong,
a little bit less on the phased loops, and a little
bit less again on the EWE, that seems the best in S/N, with this local 
So now the questions.
Reading the "The beverage antenna handbook" by Misek, third edition, at 
page 5 him more or less wrote:

locally generated electical noise from appliance etc etc etc man made 
noise is propagated in vertical polarizazion, and  lessloss soil may 
help you to dont pick up this ground wave signal

So him suggest to put under the beverage a wire to stabilize the soil, 
and expecially for have a lessloss soil that help to dont pick up local
signal coming through ground wave!
So, someone have made same test in this direction?? this point  i 
believe is very important to reduce the near noise, but how many amateur 
have the wire under your beverage?
In wich condition the soil is poor, or lossless?

Another question is again on trasformer, becouse after many and many 
message here, i dont have understand if the best solution is connecting 
to ground the cable togheter with the beverage ground, or made a 
separate ground at about 40 meters from it, or leave left it.
I have made in this 3 last years many type of trasformer, starting with 
trifilar winding like ON4UN suggest in his book, after i have made it 
with two-hole core with a u of 10.000, with very good results in loss 
and ros, and the last i have used a pair of single hole core long abt 2
cm., and i have coupled it like the two hole core, the u was abt 2700, 
the loss was 0.15 db, and ros better of 25 / 30 db ranging from AM to 15
mhz.( all the test was made by a network analizer by HP)
So all my trasformer is winding like an ac trasformer, with two 
separated  winding, and it is connecting togheter in one end, and then 
put at ground level.
For my experience, this type seems more simple to made, and the ros 
performance seems more better than the other made on normal toroid.
So when a traformer have low loss and good ros, have many important is 
the sistem of winding it?
Well, i hope that someone may answer to my question, for the moment, 
best DX to all, and here in Europe we are waiting for same station from 
south America, for us spring summer season!!!
Many 73

Giulio IK2DED.

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