Basketball Cake Ball Designs

radio and not only ... Replacement Antenna Radio Controlled Clock

For years now that my little alarm clock radio controlled, unknown brand, it makes me the bad sorprese.Non rarely get to work in the morning or one hour before and after, if all goes well, because the alarm during the night synchronizes erroneamente.Quanti damn! .. Of course after the first time I might have to replace the alarm clock, emblazoned with "Oregon Scientific, but I proceeded to another modo.Perchè not use my passion for DIY antennas on my evil alarm clock? ... And in fact!
The first thing to do is find a rod of iron more original length of the antenna to have a higher directivity and hence higher ford.
As the DCF77 signal is 77.5kHz, the ferrite material is sufficient material for power applications, such as power ferrite switching.La I found long as the antenna is roughly the original sampling clock .... I have decided to stick together more berries in order to have a rod lungo.Sotto much more you can see the antenna present within the original alarm.

Once assembled

ferrites I wrapped the coil on a small cylinder, a little larger than the diameter of the rod. Without this I measured the inductance of the coil, remembering to place the coil on one end of bacchetta.L 'is important now not to fix the hub, but lasica free to slide on the stick to make an accurate calibration.

With the classic formula:





are calculated values \u200b\u200bof capacitance and inductance of the LC race course ... and that's it. Under

carry some photos of the antenna built by me

Under the antenna with the coupon decoding welded near the condenser

Finally over the antenna, which I proceeded to Protect yourself with a simple tube plants giving a pleasant appearance .

After the antenna is now time to verify its proper operation, but not before you have connected the various wires inside the little man ... wake up photos of this step, because I think the lack of interest! There are only four wires.

Perfect, the antenna and the clock is synchronized works much velocemnte.Non I just have to fix the antenna in place and that's it.

I leave a link where you can find interesting material for the antenna design for timing signals.