The easiest antenna with a good match is a dipole, but that is a bit more challenging to deploy in the field, so I opted for an end-fed halfway (or EFHW) antenna with a 49:1 transformer. I 3D printed a winder that allowed a BNC connector and the transformer to be mounted on the...
things like the parts (such as transformer, diode, filtering capacitor and so on) with different material, incorrect assemble, missing parts and so on that cause noise level over the specification. To avoid these problems, checking output noise of each switching power supply is a must during qu...
Over the last 1-2 years several radio enthusiasts have mentioned theAmsat QO-100 Es’hail2 stationary satellitebut so far I had no clue where to begin receiving signals from it. There seems to be no shop selling a complete kit so one has to source and assemble the parts. Here’s a vi...
Step 10: Attach whatever connector is necessary to the other end of the coax cable. This may be a chinch type plug or a BNC or a PL-259 or whatever your monitor requires. The first one, in a video context, is a joke because it is never impedance matched to anything, which, because...