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Category Archives: Electronics

nanovna vs keysight fieldfox vna

Comparing NanoVNA with the Keysight Fieldfox N9952A

Vector network analysers (VNA) come in all sort of price ranges. Most of them are out of reach for a typical hobbyist. Very few VNAs are available to be bought by someone like you and me. For example, the $500 miniVNA and the sub-hundred dollar

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nanovna review

NanoVNA – A short review

Do you build RF circuits? Have you built any antennas? If the answer to any of the two questions is YES, then you know how valuable having a VNA (Vector Network Analyzer) is. Just an year ago the cheapest VNA on the market was the

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Using LimeSDR mini as a RF source

In one of the previous posts we saw how we could transmit DATV using LimeSDR mini. This time we are going to use our LimeSDR mini as a RF source in our home lab. The whole setup is based on GNU Radio and the QT

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MAX2870 PLL PCB with STM32F103 microcontroller designed by Salil Tembe

Manual VCO selection for a faster locking PLL

PLL chips such as the ADF43xx, MAX287x and so on come with an integrated VCO. The frequency range on these PLL chips can extend all the way from few tens of MegaHertz to several GigaHertz. Such a wide range of output frequency can be obtained

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A simple voice detector circuit

Voice detector can find it’s use in voice-activated circuits. For example, triggering a transmitter or enabling a speech processor and so on. At the end of this blog post, we will look at one such application. A voice detector is a circuit which will either

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RF Pulse generation with RF switch

Remember the previous post where we generated PWM? We are going to use the PWM output from the TivaC microcontroller and drive an RF switch. I will be using the Minicircuits HSWA2-63DR+ SP2T switch to generate pulsed RF output. Correspondingly, A simple SP1T switch would

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tiva pwm tutorial

Generating PWM on Tiva C connected launchpad (TM4C1294)

Texas Instrument’s Tiva C connected launchpad is a really powerful Cortex M4 microcontroller board. The possibilities with this chip are endless. In this post, we will be generating PWM output on one of the GPIO pins of TM4C1294 microcontroller. A simple PWM output can be

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Getting VHF station up and running

Days after clearing the ASOC examination, I finally got an official callsign – VU3XEN. The callsign would be useless if I have no means of communication. This post is going to be really short where I would be describing the process of getting a VHF

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Fabricated dual directional coupler.

Home brewing a simple antenna analyzer – Part 1

A primary tasks of an antenna analyzer is determining how good of a match an antenna has with the transmitter. One of the ways of determining that is by looking at the reflected power from the antenna port. In simple words, an unmatched impedance of the

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DRA818V pcb

DRA818V VHF band transceiver – Part 1

Necessity to stay connected with others is growing by the day. In cases when mobile network is out of reach and a message needs to be relayed or received, ham radio can prove to be quite helpful. Let us not get into the details as

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