[RFI] Maintaining 50 Ohms...

[David Eckhardt]

I have lost too many preamps due to near-by lightning and static
discharge.  After the last (expensive) MMIC failure, I have made a practice
of installing a resistor to return (chassis or "ground") across the input
coaxial connector.  The value is anything over 10 kohms.  The disturbance
to the 50-ohm impedance is completely negligible.  The rule-of-thumb on the
resistor value is something over 10X the system impedance.  I've even used
1k successfully.  Go for it !!

Dave - WØLEV

On Fri, Sep 17, 2021 at 10:36 PM Dave <dave at nk7z.net> wrote:

> Hi,
>
> I am building a static bleed resistor, (5 Mohm), inserter, and want to
> place it on the transceiver output, not at the feedpoint of the antenna...
>
> I have not seen this done in this way before, which may indicate there
> is something bad about doing it this way...
>
> Does anyone know why this might be a bad idea, assuming I can maintain
> 50 ohms while adding 5 Mohms to ground off the center of the coax?
>
> --
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist, RFI
> ARRL Asst. Director, NW Division, Technical Resources
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-- 
*Dave - WØLEV*
*Just Let Darwin Work*