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Hello all,
I want to use a 600 ohms : 50 ohms balun to match a 10 feet random wire to my HF receiver. From the book said, the wire should be 30 feet long for 600 ohms.
(Q1) If I reduce the length of the antenna, the impedance would be increased? If yes, how much is the impedance of that...
Thanks for giving me many ideas. Due to too small of the metallic case, I cannot add screws on the both side of the pcb.
Finally, I made the changing,
(1) isolated the connection between the BNCs and the housing (replaced the BNCs with an isolating type BNCs).
(2) connect the PCB GND through two...
Hello,
Because the housing is very small, and the connection between the BNCs and the PCB is lesser than 1 cm, I cannot use coaxial.
I will try to use a segment of coaxial shielding as the GND connection on both end, reduce the inductance of the GND connection. please wait for my result.
Thanks...
Hello all,
I designed a 30MHz LPF for SWL, the result is quite good, cut-off point at 33MHz, max attenuation more than 50dB, the curve rising up at 200MHz. I soldered all the component on a tiny single layer pcb (20mmx26mm). Total 4 smd capacitors and 3 smd coils.
But I pull it into a small...
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