Most of the LF receivers of this type need an active antenna. 10 mv injected is a huge signal compared to what you might receive perhaps 10 uv as a guess. I have a fluke and a singer for 60 khz wwvb in the US and use a loopstick and preamp using a mpf102 and follower transistor. Believe there are far better options today.
On Tue, Oct 20, 2009 at 5:27 PM, Marco A. Ferra <mafe...@gmx.com> wrote: > Hey time-nuts people, > > First of all, let me start by saying that I follow the time-nuts mailing > list for some time and it's a great source for trading experiences. Perhaps > you can help me on this one. > > We have in our laboratory, in Portugal (near Lisbon), an Adret 4101A > Frequency Receiver Standard, and we are trying to pickup the DCF77 signal > from Frankfurt, Germany. I wasn't sure if the unit was working properly (it > seems quite old), but by injecting directly a 10mV 77,5 kHz sinusoidal > signal in the BNC antenna input I got the "level" and the "locked" green > leds to lit (it seems good news). > > However, I believe that the DCF77 arrives very weakly in Portugal, and I > thought on constructing a passive or active, but very simple antenna to > connect to the Adret 4101A. > > Do you have any experience on this equipment (we don't have the manual, > just a brochure with a few pages [1]), the DCF77 signal itself or an ideia > for a antenna that could be very sensitive to this signal? > > Kind regards, and thank you in advance, > > [1] > http://www.adret-electronique.fr/appareils_adret_metrologie/4101a/4101a.pdf > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.