Johnson's Techworld

QRP or low power operations are quite popular abroad, especially for portable operations like Parks on the Air. I was also a regular QRP operator when I started

Used my FT-710 radio to check the transmitted signal and spectral spread of my homebrew Easy BITX SSB signal. 18 dB attenuator was used in FT-710 to reduce

Straight calculation is 4V into 50Ω = 0.32 W, provided, the RF probe is showing the accurate RF voltage! I am on the lookout for a 6V bulb

I was hearing a lot of activity on 40m band with several nets and other ragchew going on. Suddenly the signals started dropping with the waterfall becoming almost

Compared the RF voltage at the inputs of IRF510 and that of the Darlington pair of 2N3904s before that, using N5ESE Classic RF probe homebrewed by me. RF

This is the LMR SDR 1.1 PCB which I bought from VU3ZOF. I have bought five ICs also along with it, which are difficult to source otherwise. Si5351

I have bought five integrated circuits along with the LMR SDR 1.1 PCB. Thought of having a look at them and learning their main functions. HD74LS145P It is

I heard VU3AVE on 40m with good quality audio when he was using a homebrew LMR SDR 1.1 with a homebrew 30W linear amplifier. That made me think

I am trying to avoid self oscillation in my homebrew Easy BITX by gradually reducing the bias voltage to IRF510 final transistor. It is quite a sensitive step

I have been busy with various HF radio homebrewing projects so that I have not been trying LEO satellite operations for some time now. As one of the