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" <mag...@rubidium.dyndns.org> To: "Discussion of precise time and frequency measurement" <time-nuts@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 > > _______________________________________________ > 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.
