Good idea... do you think to use batteries or along the differential line run a power line? Power... only a few mA would be enough.
On Wed, Jun 27, 2012 at 6:20 PM, Chris Albertson <[email protected]>wrote: > One trick that works, place the entire receiver. on a pole (black ABS pipe) > fixed to the back yard fence. This places it as far from any house or > power line. I don't think the pole needs to be tall. 8 feet get should be > enough. Of course now you need a long wire and a pair of RS422 driver > chips and so on. > > My next experiment with this will be to use a loop antenna. > > > > On Wed, Jun 27, 2012 at 8:59 AM, Kasper Pedersen <[email protected] > >wrote: > > > On 06/27/2012 04:04 PM, Tony Finch wrote: > > > > > Are there any basic steps I should take to improve the reception > quality > > > of a radio clock? I have a cheap and cheerful DCF77 receiver for > > > connecting to some GPIO pins, but its PPS output is basically noise > with > > > maybe a one-second period. Perhaps it's just cheap and nasty. > > > > > > > > > Be careful what you connect the ground of the receiver to. > > > > When I did my DCF77 receiver, my first source of interference was the > > common noise on the output of the supply I was powering it off of. > > I went to a linear power supply, and things were good for a few years. > > > > Then they installed remote-reading power meters in the neighbourhood, > > and DCF77 was completely jammed. The meters talk back on 75kHz with > > ~6kHz bandwidth. Halfway by accident I found out that if I earth the > > receiver well enough, thereby shunting off some of the 75kHz common mode > > signal, I get mostly reliable reception all day. > > > > I would suggest, at least for development, a battery and an optocoupler > > to isolate the receiver section from conducted interference. > > > > Hmm, I do have a Pi. > > And when you have trouble decoding the signal at around 04 in the > > morning, you too will have rediscovered sferics, and the need for a > > filter that handles that. > > > > /Kasper Pedersen > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
