Re: Receive FM Radio Station #bitx40
Mike aka KC2WVB <rb5363@...>
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What ever the outcome you did great! Most people did not build from scratch and source their own parts.
Too bad my lack of knowing your language may make it difficult to be of much help. However, let me ask this simple question. What are you using for an antenna? If it is not something like a dipole cut to 40 meters or 20 meters or 80 meters...then you may hear nothing but noise and interference on the receiver.
My version of the radio came to life when I connected a 40 meter dipole to the rig. The 40 meter dipole is two wires each 32.5 feet long connected at one end to either the center conductor or shield of 50 ohm coax cable. The other end of the coax runs to the rig. The feed point of this antenna, I.e. where the wires connect to the coax, is ideally elevated to 1/4 wave length in height or roughly 33 feet.
I could not elevate my 40 meter dipole so I built a compromise dipole. The issue that occurs when the dipole is not elevated to 1/4 wavelength is that the feedpoint impedance becomes terribly low to the point it is far short of 50 ohms and nearly nothing can then be heard. So, I made my dipole as a folded dipole that uses two wires on each leg. This raises the feedpoint impedance of the antenna to such an extent that it is actually spot on 50 ohms when it is barely off the ground. This of course changes the radiation pattern but not enough that I don't still pick up Dave, on or about 7.145 MHz, out of England whenever he keys up.
AgIn good luck, hope you get the bugs worked out.
On Tue, May 29, 2018, 4:12 AM <qonita.salimah@...> wrote: