Johnson's Techworld

It has been a long story trying to work VU2TUM on CW ever since he emailed me some time back that we should fix up a sked and

Onam is the most important regional festival of Kerala and is celebrated widely. School students get a 10 day holiday, typically after their quarterly exams. The whole mood

I have connected the 200 ohm impedance side of the DIY balun to the ladder line, presuming 50 ohms impedance of coax on other side. 50 ohms side

Got good SWR match with 4:1 balun on bench test with NanoVNA from 1 -11 MHz. So it should cover 160m, 80m and 7 MHz bands. The final

This is the 4:1 balun which I homebrewed just now for connecting between my recently homebrewed ladder line and a short piece of HLF 200 cable which goes

Ladder line is one of the three types of twin-lead parallel wire balanced transmission lines used for radiofrequency applications. It is a balanced transmission line unlike the popular

The NanoVNA has been connected to the antenna system using a small SMA to SO 239 jumper cable. PL 259 on the 183 cm long HLF 200 coaxial

Two important updates for my loop antenna with ladder line. One limb of the loop antenna was elevated to about 10 m from ground on fibre pipe which

Measured out a piece of HLF200 coaxial cable with just enough length to connect radio to the ladder line outside. It was 183 cm long. Stripped the outer

Ten meter long ladder line was made using 2.5 sq mm insulated copper wire, 2 inch long pieces of drip irrigation tubes with 6 mm diameter and 20