08-08-2017, 10:10 AM
(06-06-2017, 10:24 PM)vk2ziw Wrote: Has anybody investigated the HF noise problems from the generic chinese 1-2Kw generators?
I have a GMC 850W and a Dingo 900W 2-Stroke. Both have the same alternator.
Looking at the waveform (after a 240 to 24V transformer) it's horrible with obvious
PWM of the field excitation an maybe 1000Hz.
Ignition noise (spikes at a regular 25 or 50Hz) most noise blankers are designed for.
Anybody looked?
Alan VK2ZIW
I have a cheaper (i.e. not Honda) inverter generator which produces some HF noise, most of which is radiated from the extension lead. I use one of Jaycar's EMI filters in a diecast box which has a short lead with a plug in the input site and an outlet socket mounted on the box. The input lead has 6 ferrite sleeves on it.
https://www.jaycar.com.au/240v-ac-emi-filter/p/MS4001
https://www.jaycar.com.au/large-ferrite-...6/p/LF1260
This combination pretty much eliminated the interference. Using an earth stake makes no significant difference.
73
Iain