[hpsdr] Reverse Power Tolerance

[Helmut Oeller]

Hi and HNY Jim,

a LPF/BPF, which can't withstand  a SWR of 2 or 3 seems a bad design for me, hi. Sufficient dielectric strength of the capacitors should be provided.

73, Helmut

-----Ursprüngliche Nachricht-----
Von: Hpsdr <hpsdr-bounces at lists.openhpsdr.org> Im Auftrag von Jim Sanford
Gesendet: Montag, 31. Dezember 2018 23:11
An: hpsdr at lists.openhpsdr.org
Betreff: Re: [hpsdr] Reverse Power Tolerance

***** High Performance Software Defined Radio Discussion List *****

One counter-argument:  What about the components in the low/band pass filtering?

I ask, because I have repaired several bandpass filters for our club that were blown up running 100 watts into an antenna with high (2 or 3 SWR).  We have been pounding on guys to put the filter BETWEEN the radio and the antenna . . .

73, Good luck, & Happy New Year!

Jim

wb4gcs at amsat.org


On 12/31/2018 10:27 AM, Helmut Oeller wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> HI Tony,
>
> the final MOSFETs are specified with : 'no destroy'  at a load 
> VSWR=20:1(All Phase).
> So no concern, if your meter even shows 3:1 equal 50 percent reflected 
> power for a short period of time. On the other hand it makes no sense 
> to run a antenna with 3 dB mismatch.
> Excessive mismatch endangers the finials due to therminal stress 
> and/or RF voltage issues, but usually no problem for the driver or 
> actually your exciter board Hermes.
>
>
> 73, DC6NY
>
> -----Ursprüngliche Nachricht-----
> Von: Hpsdr <hpsdr-bounces at lists.openhpsdr.org> Im Auftrag von Tony 
> Hagen
> Gesendet: Montag, 31. Dezember 2018 10:46
> An: hpsdr at lists.openhpsdr.org
> Betreff: [hpsdr] Reverse Power Tolerance
>
> ***** High Performance Software Defined Radio Discussion List *****
>
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