Hello Murray,
I assume that this message was not for me
But on the other hand, I am highly intersted in Building a LF- TX You
metioned in the letter.
At present time I struggling in programming a Attiny 2313 as a replacement
for AT90S2313.
73
Uwe, DK1KQ
----- Original Message -----
From: "Murray ZL1BPU" <[email protected]>
To: <[email protected]>
Sent: Friday, June 16, 2006 11:55 AM
Subject: LF: Re: Re: PAs
> Uwe,
>
> It certainly looks like 2nd harmonic problems to me too, probably
linearity
> (gain) imbalance. Another thing you will have discovered is that with the
> harmonic information Peter mentioned, the SWR meter or bridge (if you use
> one) won't give good nulls, because the harmonic content won't be matched
at
> the antenna tuner.
>
> Either you need a rather better low pass filter, or to sort out the
> non-linearity. My LF TX operates in Class D (can't get more nonlinear than
> that) but the waveform is nicely sinusoidal at the antenna. Mind you,
third
> harmonic is my problem, not second.
>
> 73,
> Murray ZL1BPU
>
>
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