[RFI] Maintaining 50 Ohms...

[MICHAEL ST ANGELO]

I also use high voltage input coupling capacitors on my preamps. This is a trick I learned by the CATV industry.

Mike N2MS

> On 09/18/2021 7:35 AM Dave <dave at nk7z.net> wrote:
> 
>  
> Thanks gents...  The resistors I am using are 10 M, 20KVs.  I will build 
> a small chassis and put them on inside, with a pair of SO-239s.
> 
> 73, and thanks,
> Dave (NK7Z)
> https://www.nk7z.net
> ARRL Volunteer Examiner
> ARRL Technical Specialist, RFI
> ARRL Asst. Director, NW Division, Technical Resources
> 
> On 9/17/21 6:25 PM, Jim Brown wrote:
> > On 9/17/2021 5:54 PM, David Eckhardt wrote:
> >> 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.
> > 
> > A limiting factor for low values is dissipation in the bleed resistor.
> > 
> > 73, Jim K9YC
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