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| To: | <[email protected]> |
|---|---|
| Subject: | LF: Re: Re: PAs |
| From: | "Murray ZL1BPU" <[email protected]> |
| Date: | Fri, 16 Jun 2006 21:55:28 +1200 |
| Delivered-to: | [email protected] |
| References: | <44894231.30866.D42969@localhost><00b601c68baa$e8cf78d0$26180d54@traceydlqceh0p> <[email protected]><[email protected]> <[email protected]> <002101c6910f$d5868e20$0300a8c0@LAPTOP> |
| Reply-to: | [email protected] |
| Sender: | [email protected] |
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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