Johnson's Techworld

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

Today I found out that the coax connection to the PCB had a break in the central conductor. Repeated tilting of the board to see reverse side for

•Still no output detected at the dummy load with LED indicators or when connected to external power meter and antenna! •LCD display showed increase in ‘S Meter’ readings

LB7UG suggested adding two LEDs antiparallel with (in opposite directions) and a 4.7 K resistor in series to my QRP dummy load to get a visual indication of

Set out to check the voltages at IRF510. These were the voltages which I got: Gate 1.78 V (after turning the 10K multi-turn preset about 8 turns clockwise

VFO output of the Raduino board in Easy BITX is from the 34th pin of the long 40 pin connector soldered to the PCB. That goes to the

My homebrew N5ESE Classic RF probe had shown very low voltages when I measured 5W output from my FT-710 radio to a homebrew 5W dummy load. Possible reason