Electronics and Technical resources from vu3dxr
Recently i got a ubitx V6.1 transceiver at lamakan 2024 event and kept the same idle due to mqth commitments. Later i decided to fire the rig during the week end. Unfortunately, the experince was not good. Audio is too chirpy and unpleasant to hear. But Tx audio is good as per other hams reports. …
Microphone Audio Compressor in SSB Radio Single-sideband (SSB) radio, a dominant mode in amateur (ham) radio and other communication applications, transmits voice signals with improved spectral efficiency compared to older AM (amplitude modulation) methods. However, SSB has limitations in terms of audio quality and intelligibility, particularly in challenging propagation conditions. This is where …
MXR Dyna Comp can be used as an audio compressor in SSB Amateur transceivers. The MXR Dyna Comp is a guitar effects pedal designed specifically for electric guitar. While it is a compressor, it wouldn’t be ideal for use in SSB transceivers for a few reasons: Impedance: Guitar pedals have a much higher input impedance …
Microphone compressor using LM1458 The LM1458 is a dual operational amplifier (op-amp) that finds applications in audio amplification and other circuits. Let’s explore how you can create a simple microphone preamplifier with compression using the LM1458. To get greater transmitting performance from your ham radio transceiver, we need to keep the modulation level constant, regardless of …
Condenser Mic audio amplifier The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0.5 watts at 4.5 volts. It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form the mic preamplifier. Resistor R1 provides the necessary bias for the condenser mic …
Dual microphone noise cancellation using LF351 Op Amp Dual microphone noise cancellation (also known as Dual Mic ANC) is a technique used to improve the quality of audio captured by microphones in noisy environments. This circuit dual microphone noise cancelling using LF351 Op Amp uses two mics back to back, each amplified, one inverted, and …
Series Modulated AM Transmitter A series modulated AM Transmitter is a type of radio transmitter that uses amplitude modulation (AM) to transmit audio signals over a carrier wave. It’s known for being low-power and simple to construct, making it a good option for beginners or those interested in QRP (low-power) applications. In a series-modulated AM …
Class E – AM Transmitter A Class C AM transmitter is a type of high-efficiency, solid-state transmitter that is popular among amateur radio enthusiasts. It is known for its simplicity, affordability, and efficiency compared to other types of transmitters. Unlike Class E’s switching operation, Class C amplifiers operate in a more “on or off” manner. …
