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

[EWKehren at aol.com]

Alan,
 I used a copper pipe because it is the easiest way to make a round  loop. 
I have also used PVC but it always ended up rectangular. If you have a  
better idea please let me know, because I am considering to fire up my old  
Tracor 599 receiver that I modified to work up to 80 KHz. Used it a long time on 
 60 KHz.  
Bert Kehren    WB5MZJ
 
 
In a message dated 10/21/2009 5:19:28 A.M. Eastern Daylight Time,  
alan.melia at btinternet.com writes:

Hi  Magnus I was not sure whether the 4101A would go up that far. I had  not
noticed the news about HBG.  That is a disappointment,  particularly with 
the
number of "radio clocks" around in "domestic" use,  and from the "Land of
Clocks" too.

Someone mentioned a screened loop  in copper pipe. Screening loops at this
frequency gives little advantage  and the extra stray capacitance can 
degrade
the performance. An open loop  works just as well (and is much easier to
build for a trial) the problem  usually comes from common mode pick-up on 
the
feeder to the receiver. This  is often best combatted by careful balancing,
or transformer  isolation.

Alan G3NYK

----- Original Message -----
From:  "Magnus Danielson" <magnus at rubidium.dyndns.org>
To: "Discussion of  precise time and frequency measurement"
<time-nuts at febo.com>
Sent:  Wednesday, October 21, 2009 1:30 AM
Subject: Re: [time-nuts] Adret 4101A,  the DCF77 and a good antenna


> Alan Melia wrote:
> >  Marco, have you considered that HBG on 75.0kHz might be stronger  with
you
> > from Switzerland??. In a lab or other complex quite  often with off-air
> > standards the problem is local noise. I have a  friend in Porto who used
to
> > be able to lock to MSF when it was  at Rugby a few years ago.......I
havent
> > asked since it moved  north to Anthorn but I suspect he uses GPS now. If
the
> > noise  is not a problem these receiver will often work well on a
resonable
>  > wire antenna which is fairly easy to rig. Or see the PA0RDT  MiniWhip
design
> > for a very simple active low frequency  antenna. This is used all round
the
> > world for receiving weak  amateur signals on 136kHz ....it is broadband
up to
> > about  500kHz, and down to 40kHz Japanese frequency  standard
transmissions.
> > It is so small you can experiment to  find the best quiet position. At 
LF
the
> > secret is the higher  the better.
>
> The TDF 162 kHz is a 2 MW transmitter which is  even closer...
>
> A bit tricker to retriev the timing signal  thought, but this is assuming
> the signal can be freely  selected.
>
> The HBG transmitter is going off-air (for good) in a  not to distant
future.
>
> Cheers,
>  Magnus
>
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