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MFJ-989D versa tuner v

Heavy Metal

Heavy Metal

Active Member
Aug 23, 2014
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what is the ?-???? pf range of the air capacitor? ( is both transmitter and antenna air coils same capacitance? )

what is the ?? uH range of the inductor and wire gauge size(16ga, 14ga, 12ga 10ga)?
 

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What happens if one changes the roller inductor from 24-uH to say 35-uH or 44-uH or even 77-uH? Or change out air capacitors to vacuum one instead of 500pf 10-1200pf?

Curious about it for something kinda doodling in my head for a home made tuner.
 
Heavy Metal said:
What happens if one changes the roller inductor from 24-uH to say 35-uH or 44-uH or even 77-uH? Or change out air capacitors to vacuum one instead of 500pf 10-1200pf?

Curious about it for something kinda doodling in my head for a home made tuner.
Click to expand...
Obviously a larger tuning range. Vacuum cap vs standard air gap higher voltage handling and more consistent capacitance.
 
Just trying to figure out range values of capacitors and inductor value for a broadband. It's just for fun.
 

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