Thingiverse
Labelled caps for OSL calibration loads by vk3ohm
by Thingiverse
Last crawled date: 4 years, 7 months ago
Those who use Antenna Analysers, and similar devices, will like to periodically calibrate them with OSL (Open, Short & Load) terminators. These are easy to make out of OTS BNC or SMA connectors, but they look so much nicer when they have a labelled cap on them. This thing is 3 caps - 0 ohm, 50 ohm and Open Circuit for such terminators.
Construction is straightforward.
Cut off all center pins.
0 ohm simply has a wire soldered from center pin to body.
Open Circuit simply has center pin cut off.
50 ohm is tricky. I have seen 2 x 100 ohm SMD 1206 resistors soldered direct from center pin to body. I had great difficulty doing this, and they kept breaking. I just soldered 2 back-to-back, put flying leads on them, and they fit inside the body.
Construction is straightforward.
Cut off all center pins.
0 ohm simply has a wire soldered from center pin to body.
Open Circuit simply has center pin cut off.
50 ohm is tricky. I have seen 2 x 100 ohm SMD 1206 resistors soldered direct from center pin to body. I had great difficulty doing this, and they kept breaking. I just soldered 2 back-to-back, put flying leads on them, and they fit inside the body.