Hacker News Reader

Whilst the impedance of the line under yesterday's test conditions wasn't measured, it was replicated again this morning, and from memory it was around the 900 ohm mark. I'll be testing again tomorrow (trying to run bonded data across two of them) so I'll try and get a recorded measurement of the line's impedance at some point rather than just something from memory.

View on HN

Great! That will be very interesting. It was just guesstimation on my part but the diameter and separation of the strings looked similar to high impedance lines used in SW amateur equipment typically in the 400-600 ohm range. A couple sites I've read state that ASDL actually experiences about 100 ohms impedance as opposed to voice (600 ohms) due to the large frequency difference. If all that is true then bringing the strings closer together will lower impedance which should improve the match.

Reply on news.ycombinator.com