24-03-2018, 09:38 AM
Hi Chas,
The slug belongs to Matt VK3PP and came with the meter he bought on an auction site.
You image is a great help and looks nothing like the insides of this slug. The loop is much different and sits a lot closer to the line.
Parts were changed out of exasperation rather than science or logic. The terminating resistor was marked and did read 68ohms. The previous owner (unknown) left a screw out of it so we knew it had been tampered with.
Replacing the terminating resistor with a 18K meant we could adjust it to read approx half scale with 20W in however we no longer had directivity. I guess we have a low power slug that has been mis-labeled.
Like you said, only four parts how hard could it be. Matt has gone home now but we'll keep looking at it when we catch up next.
The slug belongs to Matt VK3PP and came with the meter he bought on an auction site.
You image is a great help and looks nothing like the insides of this slug. The loop is much different and sits a lot closer to the line.
Parts were changed out of exasperation rather than science or logic. The terminating resistor was marked and did read 68ohms. The previous owner (unknown) left a screw out of it so we knew it had been tampered with.
Replacing the terminating resistor with a 18K meant we could adjust it to read approx half scale with 20W in however we no longer had directivity. I guess we have a low power slug that has been mis-labeled.
Like you said, only four parts how hard could it be. Matt has gone home now but we'll keep looking at it when we catch up next.