08-06-2017, 08:19 AM
I was given a GMC 850 (or 900 watt?) genny earlier this year and fired it up into 300W of light bulb loads but haven't looked at the waveform. Maybe a LPF inserted in the 240VAC mains output is a reasonable solution. A multisection LPF (Fc < 150Hz) rated at more than 300V would also round out spikes as well as make the AC waveform a little more sinusoidal.
My FD setup is to use only the 12V output to charge the 300AH battery bank, the 240V AC output is simply ignored in the field, the battery is thus effectively a very large capacitor so any spikes could be ignored. If it is a sunny day, 2 x 80W solar panels plus regulator are used and they produce much the same charge current as the genny - though not very effective at night
I don't get much impulse noise off my little genny even on HF with the NB off and I suspect that is the case because the spark plug lead is resistive and quite short.
I will put a CRO on to have a look at the waveform when I pre-test the genny in the next week or two in prep for the Winter Field Day.
73 Doug VK4ADC
My FD setup is to use only the 12V output to charge the 300AH battery bank, the 240V AC output is simply ignored in the field, the battery is thus effectively a very large capacitor so any spikes could be ignored. If it is a sunny day, 2 x 80W solar panels plus regulator are used and they produce much the same charge current as the genny - though not very effective at night
I don't get much impulse noise off my little genny even on HF with the NB off and I suspect that is the case because the spark plug lead is resistive and quite short.
I will put a CRO on to have a look at the waveform when I pre-test the genny in the next week or two in prep for the Winter Field Day.
73 Doug VK4ADC
Doug VK4ADC @ QG62LG51
http://www.vk4adc.com
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http://www.vk4adc.com
This Forum is only going to be as interesting as the posts it contains.
If you have a comment or question, post it as it may trigger or answer the query in someone else's mind.