unfortunately I do not know the ansver to your question, but I am
VERY interested on this kind of antennas for my 137 and 500KHz rx ..
please, how big are the "probes" ???
Is this antenna also usable for 8KHZ dream bands, or for SAQ Grimeton
reception ??
I tried the PA0RDT mini whip, but I am not satisfied .. noise, noise,
noise and (I think) intermodulation ....
Many thanks in advance..
73 de Mauro IK1WVQ
At 17.42 28/05/12, you wrote:
Hi,
After all those meta-discussions here's a more serious problem:
I'm playing around with a new e-field probe based on the INA111.
http://www.ti.com/product/ina111
Schematic: http://www.df3lp.de/misc/rx/INA111_preamp.png
It's working fine and the local interferences are lower compared to
my old non-balanced design running here on balcony. That was the goal.
Amplification is quite enough to drive a M-Audio audiophile 192 soundcard.
There's a second transformer (1:4) at the af-inputs. The coupling
capacitance of those transformers are below 10pF each.
I'm using the shields of a thin double coaxial line for bringing up
the supply voltage. The voltage splitter is located at the far end
inside the small amplifier box.
The problem is that I'm observing to a lot of interferences/microphonics
"from behind" when touching the battery located inside the house.
???
Peter, df3lp
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