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All posts by nuclearrambo

Building an automatic gain control (AGC) circuit

Most amplifiers we use have a fixed gain. In case of excess input power, the amplifier saturates. As a result, the blocks down the receive chain also get affected by this. To avoid this, the preferred technique is to reduce the gain of the amplifier

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Cable impedance profile with NanoVNA and TDR script

We have gone over NanoVNA so many times in the past. I did a complete review of the inexpensive NanoVNA last month. Furthermore, I compared it with the super-expensive Keysight N9952A Vector Network Analyzer. Finally, I wrote a small script to compute the TDR response

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Transmitting SSB audio with LimeSDR Mini

There are so many new RF devices coming out these days which has pushed the envelope the technology where a common person can access it. In one of the previous posts, I demonstrated how LimeSDR mini can be used like a RF source. This time,

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Accurately measuring cable length with NanoVNA

Update: Now you can plot the impedance vs. distance/time plot. Click here to learn the concept. Original Post: Having a VNA opens up so many possibilities. Just last week, I reviewed the nanoVNA and found to be an interesting device to have. Having handled expensive

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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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Transmitting DATV over the air with LimeSDR-Mini

Transmitting voice is something every ham operator must be doing regularly. There is a breed of hams which only stick to digital modes, while some prefer morse. Some ham operators go above and beyond to transmit real-time video stream over the air. Back in the

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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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