[time-nuts] Adret 4101A, the DCF77 and a good antenna

[paul swed]

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 <maferra at 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
>
>
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