Re: LF: VLF/LF-Preamp

[pws <pws@legal-medicine.de>]

Hi Mauro,

Sorry about the delay. Some workload.

You wrote:
> ...
> 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 ??
> ...
The two "probes" are only 30 cm of length, using 4 mm of insulated wires.

For 137 kHz it should work, but at 500 kHz the common mode ratio will be
less sufficient - according to the datasheet of the INA111.

These input filters are nearly optimal from 10 up to >100 kHz.
For 8 kHz I would suggest increasing the series capacitors from
22 pF up to ~50 pF.

I made screen shots. Will upload them next.

Peter, df3lp