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Joined: Thu, Mar 7th 2019, 17:54 Roles: N/A Moderates: N/A

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RF Filter Design May 15th 2020, 18:34 1 5,107 on 15/5/20

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Topic Author Posted On
RF Filter Design pamam on 15/5/20
I'm looking f a reference to a filter design: a 2 Stage Filter that is an old style starting with a shunt impedance (LC parallel resonant), followed b a series Capacitor followed by another Shunt impedance as the first one, for bandpass mode. It is preceded and followed by an equal size capacitor. This circuit needs to work bidirectionally since input is both from the left and right depending on TX or RX mode
Any reason to have a Serial Port on a new Computer? WA2FTV on 15/5/20
It is very unlikely to be able to get a laptop with a standard serial or parallel (printer) port these days. With USB, WIFI, internet and Bluetooth connectivity there's no reason for them. Only hams and DIY people that want to talk to serial or printer ports, such as myself, need them. The easiest way is to go with Arduino boards and usb connections to them. I'm in the process of trying to get a DDS board to work from my laptop: Arduino allows you to write code in their IDE or from a Web-Based IDE which programs the Arduino to run an IOT device such as a "DDSBoard" frequency synthesizer i.e.
Arduino's web editor is here

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