30 watts from an audio amp is stepped up with a 1:4 ferrite xfmr.
One end of the secondary is grounded, the other goes to 2 pie
coils wound with 3 strands of 0.08mm wire, L~450 mH R(DC)=437
The 100m wire is about 12 m average height and the aerial current
is about 20mA, with a large uncertainty. 5 km is the best DX,
with about 10dB S/N at 3.3km.
I recall Markus or you posted the maths for erp vs natural noise
on 8 kHz. A reminder would be most helpful!
The 10k race was most gratifying even if I couldn't catch my
pretty little physiotherapist!
73 & TNX
On Fri, 15 May 2015, DK7FC wrote:
R Joe, thanks.
Now, what is your setup on VLF? Are you using a 100m wire which you are using
for LF/MF as well?
What is the effective height and what is the antenna current? How do you
couple the TX to the wire and what is the output power?
Am 15.05.2015 00:29, schrieb [email protected]:
Your VLF probe design works well -- but sadly the 36km photons