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Problem with Class E Modulator




 
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vk3alk
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« Reply #25 on: January 31, 2018, 06:53:58 PM »

I forgot to mention too that the cores are gapped with PCB appox .8mm  ... the copper filed off....

And Justin on the wire used on your T300-2 cannot see why using multistrand would make any difference over solid wire that I find hard to get now as well  Angry


Wayne


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steve_qix
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« Reply #26 on: January 31, 2018, 08:00:19 PM »

For solid wire, I use Romex cable of the correct gauge and take it apart.  Works great!
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« Reply #27 on: January 31, 2018, 08:06:09 PM »

I'm using IE33 Ferrite cores used in many Computer SMPS in the 350 watt - 500 watt range....
Its a 6 pole filter......the 1st inductor is 13uH .......2nd 51uH ..........3rd 37uH

The cutoff is appox 30Khz

Impedance of 6 Ohms

Voltage is around 42 volts @ 7 Amps


Wayne

I can't find any data on the cores you are using, so can't do any magnetic calculations.

But, I'm assuming you did some calculations or used software to plot the inductance over the current range of 0A to about 50A (the peak current at full modulation).  If the inductance varies more than 8% or thereabouts, the filter's effectiveness will be compromised at high levels of modulation.
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vk3alk
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« Reply #28 on: January 31, 2018, 09:39:22 PM »

No to be honest... just listening on a receiver..... Roll Eyes

Have asked for data info from one company and if they reply will start a new post subject...


Thanks


Wayne

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