Hi Stefan, VLF,

I too built a similar preamp using the LT1028 but instead of a multiturn
loop, I used a fat monoturn loop and a toroid transformer.
The loop has a diameter of about 1 meter and is made of a piece of rigid
11 mm coaxial cable. It is very sensitive on 8970 Hz and definetely requires
a quiet location.
The toroid comes from a salvaged PSU. The loop is the primary winding while
the secondary was about 60 turns.
Using the same preamp/transformer and a 20 centimeter loop, I was able to
receive SAQ and RSDN20.

73,

Michel - f5wk


Le mardi 17 avril 2012 à 23:20:44, Stefan écrivait :

> VLF,

> I just built the preamp of Renato Romero's design for a VLF loop preamp, 
> http://www.vlf.it/easyloop/_easyloop.htm
> The circuit is very easy and compact and looks very promising, 
> http://dl.dropbox.com/u/19882028/VLF/Easyloop.jpg. I took the LT1028 
> instead of the OP27 though.
> I'm looking forward to do a new /p VLF test with my hoola hop loop in 
> the forest soon.
> Is there someone on air during the next days?

> 73, Stefan/DK7FC




--