DXE sell a nominal 300Ω ladder line, DX Engineering 300-ohm Ladder Line DXE-LL300-1C, and to their credit they give measured matched line loss (MLL) figures.
Loss of ladder line: copper vs CCS (DXE-LL300-1C) – revised for 25/07/2018 datasheet was a revision of an earlier article based on an updated datasheet from DXE. I noted that the specification data had artifacts that one would not expect of such a line, and I questioned whether the datasheet was credible.
John, KN5L, recently purchased, measured and published measurements of a 10.06m (33′) section of new DXE-LL300-1C which provide an independent dataset that might cast some light on the matter.
The chart above plots:
- DXE’s datasheet MLL figures (converted to dB/m);
- MLL calculated from KN5L’s S11 open and shorted measurements; and
- theoretical MLL for round copper conductors of the same gauge as specified for the LL300 (dielectric loss is assumed insignificant).
Continue reading Loss of ladder line: copper vs CCS (DXE-LL300-1C) – KN5L’s measurement 11/2020