Re: How many Turns to take off a Toroid?
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Steve
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Here are plots of LPF from 2 QMX+ and 1 QMX
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Hope they help
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73
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Ian G4GIR
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----- Original Message -----
Sent: 06/12/2024 15:23:27
Subject: Re: [QRPLabs] How many Turns to take off a Toroid? #QMXplus
What I'd like to see is a typical healthy plot of the 40m LPF.? The only plot I've seen is on page 88 of the Operating Manual for the QMX.
I rewound the 40m LPF toroids and it moved the plot to the left slightly.? Now the attenuation appears to be -20 db for 20 meters instead of -10 db when I removed all the turns from L510 and L513.
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As far as debugging information goes, the only thing I can say is that the plots for 160m and 80m look great and I am getting 6 Watts out on those bands, and on all the other bands the LPF plots are similar to the 40 meter one with the uneven variation of the plateau of -3 to -6 db, and the output on those bands is more like 2 Watts.
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I've resoldered all the connections.
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Regards,
Steve
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