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On Monday, January 14, 2019 12:48:04 PM you wrote:
> Hi Claudio,
>
> >...some people can't live without the SWR meter on the
> >transmission line: the harmonics not irradiated return toward
> >the Tx and the SWR meter show an high value: terrible!!!
> >
> >but if you have a LPF the SWR is also high BEFORE the filter
>
> If you have the usual configuration TX->LPF->SWR_Meter->Antenna
> the indicated SWR will NOT be spoiled by returning harmonics because
> they are attenuated by the LPF and reflected into the TX.
> So only extremely weak harmonics make it to the antenna.
> Their refeflection by the antenna does'nt change SWR measurably.
Yes Clemens, I agree.
I mean that without the LPF the SWR meter measure all the harmonics reflected by the antenna, so the SWR measured can be a lot higher and can be cause of MOSFETS failure.
I come from vacuum tube Tx and I can survive with high SWR if also the transmitter can ;-)
73
Claudio, IK2PII
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