Dcf77 problem

PWM signal causing RF interference. Metal structures or interference caused by other electronic devices can cause reception problems within this range. At shorter distances the DCFsignal strength is much higher. Hi to everybody,I have a problem to synchronize ES with another computer in the workgroup.

Short explanation of the DCS, it is PCSV8.

DCFProblem Showing 1-of messages. Read 9times) previous topic - next topic. A good example is Rome, where customers told us that the DCFsignal can be receive but in the inner city there are a lot of interference making it nearly impossible to receive a sufficient signal.

DCF-signalen de senaste dagarna själv har jag problem med 2st klockor. The callsign DCFstands for D=Deutschland (Germany), C=long wave signal, F=Frankfurt and the is the frequency which is transmitted. Three times per hour this call sign is sent as morsecode during the minutes 1 and 59. I innitially had many receiving problems.

The reference signal is another RPI with a DCFtransmitter program from Andreas Spiess, that is working OK, setting the correct time on several DCFclocks.

Dcfproblem FTDC slew Warthog Hotas. To create F review we checked F18. Find helpful customer reviews and review ratings for ASUS ROG MAXIMUS VII. Hz on a GPIO pin – close enough to the 77. Hz carrier that DCFuses.

The blue line is what is measured direct from the DCFmodule (no signal at 5V and a pulse at 0V) and the yellow line what it should be (0V signal with a pulse of 5V). You can also see this clock on myweb site here DCFAnalyzer Clock page. However, the nail in the coffin is a strange signal from evening onward which is about 78. KHz and the amplitude is very stable. Because of AGC, the DCFsignal is reduced to like noise in the background.

I thought my circuit is going into oscillation because of its high Q. The battery in your watch may be too low. Ask a jeweller to check and replace the battery for you. If your watch is set to the wrong time zone (AM instead of PM) this problem may occur. It turned out later that I hardly needed the DCFreference, because this oscillator running free is accurate enough for my purposes.

So I decided to build my own DCFantenna. The problem is that the HOPF clock expects an active antenna special made from HOPF - since I had no documentation at all I just had a look with an oscilloscope at the BNC jack in the front plate of the clock.

DCFreception test ( under adverse conditions ! ) The output from the PIC-based frequency divider was used as the trigger signal of a digital scope on channel while channel was connected to the active DCF antenna. The scope was set into average mode which effectively cancels unwanted noise (a kind of correlation). The next trick is how to connect this to the DCFlibrary.

The DCFlibrary has its own idea on how it wants to read its input. Since I want to have a visible indicator of the signal anyway I solve this as follows. I change the pinMode of the DCFinput pin to output.

The problem is probably the correct initialization of the chip under the black blob (a so called chip-on-boar by the way). Maybe, I also damaged a part of the receiver while cutting out the boar or when resoldering the two joints on the 77. When the nodes are in relative proximity to one another, the propagation delays can be assumed to be similar.

On a pic controlled clock the display is always updated and correct on receipt of a good min signal. Ett genomgående problem var dock radiomottagaren ofta levererade för svag signal för att kunna avkodas korrekt. Under goda mottagningsförhållanden fungerande dock den beskrivna kretsen tillfredsställande. Abstract The task was to receive and decode a radio signal for time information, DCF77.

Right now the biggest problem appears to be the lack of active KiwiSDRs around the world. The more active KiwiSDRs there are, the better the direction finding can be. At the moment Northern Europe and the USA are fairly well represente but the rest of the world is not. Asia, Africa, Russia and South America are especially lacking.

Signál vysílače DCFslouží k přesné synchronizaci času a jeho nosný kmitočet je též možné použít jako zdroj přesného kmitočtu.