RF bypassing panel meters

[KK7UV]

I am wiring up the meter panel on my 813 build and got to wondering about what capacitor value to use for RF bypassing. I don't remember why I wrote .01µF on my plan.   I see commercial and homebrew examples with values anywhere from 0.1µF to .001µF.

In addition, some rigs use a combination of series chokes and shunt caps, and some add a pair of cross-connected diodes across the meter studs.

Any thoughts?


 

[W7TFO]

Regular DC mA & V meters should be bypassed with a .01 mica across the studs, leads as close as possible.

AC meters usually have micas from both studs to ground, at times shielded as well.

73DG

[ki4nr]

Also put diodes back to back across the meters to protect them. Depending on the voltage, you may need two in series.

[KK7UV]

Dennis - thanks!  completed the mica cap installs yesterday.