SSB noise from solar panels

[TreblePlink]

Originally Posted by Cadence

Is the IEEE still around? Whoever said sinewaves don't have harmonics should do some more reading.

Sorry, but the very definition of a sinewave means no harmonics. Fourier analysis will prove that. Now if something downstream modifies the sinewave, even slightly, then harmonics develop. A triangle wave is rich in 2nd harmonics. A square wave is rich in 3rd harmonics. A pure sinewave has no harmonics. As the sinewave deviates from perfect, harmonics develop. Many practical "sinewaves" are imperfect.

[transmitterdan]

Um...a triangle wave has only odd harmonics. No second, fourth, sixth, etc.

A sawtooth has all types of harmonics.

[Cadence]

Originally Posted by TreblePlink

Sorry, but the very definition of a sinewave means no harmonics. Fourier analysis will prove that. Now if something downstream modifies the sinewave, even slightly, then harmonics develop. A triangle wave is rich in 2nd harmonics. A square wave is rich in 3rd harmonics. A pure sinewave has no harmonics. As the sinewave deviates from perfect, harmonics develop. Many practical "sinewaves" are imperfect.

I guess you are correct if you can find a perfect sinewave other than in theory.

[Jim Cate]

Haven't looked recently, but many public libraries used to carry QST, the ARRL publication. But I suppose that in this internet environment, going to a library is unlikely to appeal!

(The above info relates to myself as a very young ham who couldn't afford to join! Simple arithmetic will show that it was a rather long time ago!)

Jim

[TreblePlink]

Originally Posted by transmitterdan

Um...a triangle wave has only odd harmonics. No second, fourth, sixth, etc.

Thank you for that correction,

[mcerdos]

I have the same issue and am wondering if a solution was found other than turning off the MPPT unit?

[hasse_A]

I had the same problem with my MPPT-regulators.
They went overboard and I replaced them with Sunkeeper PWM which are very quiet. The RFI problem is gone.

[Nicholson58]

Originally Posted by jhe

Hi, I have 400W of solar installed at the stern of my boat which is connected with a Victron MPPT 150/30 controller. I get a lot of noise from this when using my SSB. Is there a way to eliminate this or do people just turn off the solar when using the SSB?

I installed my solar and MPPT controllers with 2-pole circuit breakers. Panels and controllers can be easily shut off any time. This is also convenient for any maintenance necessary. Warning, panels off before controller off. Controller on before panels on.

MPPT controllers work using high speed switching that can cause radio interference. The same is true for PWM lighting. If the switching is in the frequency concerned you will hear it. Most manufacturers realized this some years ago for VHS radios and changed the switching frequency.