Category: NE612-NE602-SA602-SA612

Constructing a high performance transceiver for voice communication on 14MHz

  Abstract A general and good practice in engineering is a steady process of improvement. This  article describes the construction of a high performance transmitter/receiver for SSB (voice) communication covering the 14MHz (20 meters) high frequency amateur radio band. Various modules that have proven high performance, liability and ruggedness in recent constructions will be combined…

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Shrinking a QRP transceiver to (nearly) the size of a pack of cigarettes

Hint: This article is only a preview to this miniature sideband transceiver. The full description can be found here: https://dk7ih.de/2019/04/22/revision-of-the-cigarette-pack-transceiver/ The challenge started some weeks ago, when John, ZL2TCA, commented to this blog you next challange is to build a rig into a cigerette packet size case. My problem: I don’t smoke, have never smoked…

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A very compact SSB transceiver for 40 Meters with 50 watts of output power (Product detector, AF, AGC)

The demodulator section of the transceiver’s receiver starts with the product detector, which is made of another SA602. To get more audio volume a preamplifier has been added before the LM386 follows. The AGC section hast got 2 crucial components: One resistor (this case 100k) and an electrolytic capacitor (in this case 100uF): They determine the time…

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