[Lf] [Fwd: LF: Strange signals on 25 Hz (!) - any info ?]

[Andre Kesteloot]

Chas Gannon wrote:

> Where might I learn more about the receiver"a circuit of IK1ODO with
> OP07 op amplifier " ?

Hello Chas,
go to 

http://web.tiscali.it/vlfradio/looptheo7/looptheo7.htm

73
André N4ICK