shield the E-field ?

[Rothuize]

Hi to you all

 I wonder is it possible to shield the E-field
 
Because I see it  receive many noise   really   many  !!!!!!!!!!!!!!
 
I have test it  
 
Test 60min
Test 1  only the shield ferrite 18:45 – 19:45   =    signals = 3052   M=48.2%  L=20.9%
 
Test 2  ferrite shield  + 90cm loop =  signals = 5670   M=20.7%  L=33.5%
 
Test 3 E-field ( 20cm ) signals = 32854   M=11.1%  L=9.1%   very high !!!!!!
 
Here below the graphic
You see the green line  this is ok   but the rest is to noisy
So is it possible to shield the E-field  ??
 
Greetings   Gert

[Knickohr]

Shield the e-field ? From what ???

If your e-field produces so much signals, then lower the gain and/or increase the threshold. Play with the threshold, if one channel is producing a lot of triggers, disable it (setting threshold to 0).

Thomas

[cutty]

E field is designed to detect the electric component of the signal.  Shielding is designed to eliminate the electric component, on magnetic (H field) loops.  The E-field is a 'probe' antenna, and it's effectiveness depends upon "air", and the probe's physical dimensions ... it should be mounted outdoors, say a minimum of 2 meters above ground.  Mine is 7 meters.  And it should be mounted as far away from buildings, noise sources as is practical.  Because of the construction, you're not limited in recommended Cable runs, as recommended for H field... so theoretically you could easily locate the assembly a hundred meters away from the Amp and Controller... the signal delay / power loss / noise isn't the same with Coax as it might be with CAT cable....
The other thing about E field... the system is very sensitive... for example, attempting to run with similar gains to settings for H field will result in 'too much' gain.. the pre-amp gain for RED E field is actually held low by design.  During development, it was noted that 'even a metal beer bottle cap' for a probe will work!

I might suggest this thread, from WxForum net, which basically discusses and explores adding RED E field to an Existing RED H field system.  Might give you some more insight.  http://www.wxforum.net/index.php?topic=22710.0   There is other 'good reading' in other threads from the Region 3 (Americas) operators as the network grew and we struggled with the construction and learning phases.
Cheers!
Mike

[Steph]

It is also important to understand that in the e-field system the grounding is part of the antenna.
A noise free ground is just as much important as a noise free probe.

[cutty]

It is also important to understand that in the e-field system the grounding is part of the antenna.
A noise free ground is just as much important as a noise free probe.

Steph,
I'm assuming you're referring to the single ground on the controller, not a ground on the E preamp????   The coax itself if part of the filtering, and the probe capacitance uses the air as dielectric between probe and the physical earth, right?  So don't 'ground' the preamp.  Just for clarification???

Mike 

[Steph]

It doesn't matter where the ground is. Since the e-field antenna has no counterweight and isn't decoupled (wouldn't make sense without counterweight), the ground wire acts as radiator (also the coax shield if the ground is at the controller).


Could be prevented if it was this way:
   

[cutty]

It doesn't matter where the ground is. Since the e-field antenna has no counterweight and isn't decoupled (wouldn't make sense without counterweight), the ground wire acts as radiator (also the coax shield if the ground is at the controller).


Could be prevented if it was this way:

Since "it doesn't matter where the ground is", my strong suggestion, for RED, especially dual RED with H and E field reception, is to stick with the cookbook, and ground at the controller only.

[Rothuize]

Shield the e-field ?  From what ???

If your e-field produces so much signals, then lower the gain and/or increase the threshold. Play with the threshold, if one channel is producing a lot of triggers, disable it (setting threshold to 0).

Thomas

               from this big  380V noise  maker  Thomas

[Rothuize]

and thanks to you all for the reply's
I have now disable Channel A from the e-field  and run on Manuel
hope this will work ?

and yes I have ground the board  already 
If I disable it 
It will have many  more noise

[Knickohr]

Ahhhh,

I remember this picture

Test it a few hours. Maybe "auto adapt to noise" and "auto amplitude filter" ON give some more efficiency.

Thomas