Originally Posted by Thunderchild

well i was living in italy at the time and to my knowledge there were no local broadcaster minus the probably illegal transmissions from "radio maria" in the church about 4 miles away. I'm pretty sure they were transmitting as when I walked behind the church with my portable radio (in later years I lived closer to it) I could only pick up that station no matter what i tuned to.

However like i said what i got sounded foreign to me (foreign that is to both english and italian) so it was not local. I've lost the schematic of the preamp but it was just a normal RIAA preamp. the instructions were clear that it had to be a PCB, not having access to the equipment I did it on matrix board (not the strip kind) and ran transformer wire in the positions that the PCB layout showed, still i was unable to make it work, I just got this weird radio tansmission. it was also coupled to a small power amp with perhaps more cable than recomended so its no wonder starnge things took place.

Originally Posted by Space Varmint

It could have been a powerful Shortwave broadcast. Hey, that was a good explanation from MrAl on skin effect. I liked that

It may have been a good design but the board could have caused stray capacitance or something of the sort to create a tank circuit. I wanted to see the schematic because you said it was a small circuit and sometimes accidents lie that could turn out to be something useful. My ears perk up when I hear anything about radio. I rarely get a chance to do anything with it anymore unless I do it myself.

Originally Posted by MrAl

Hello there,

Glad you liked it :-)
I was thinking about throwing in some formulas too just in case
anyone wants to calculate a few examples or even something to
do with something they happen to be working on.