Hello Jim en Colin,
Thanks for info.
It will be an extra capacitor switched in parallel with the variable plate
capacitor (so within the tuning circuit)
I "cooked" already two of these (different) doorknobs in just a few minutes.
I guess Colin is right, it must be the high currents.
I have no idea what the currents are, and often they are not stated on the
websites which makes selecting the proper device difficult.
I looked at
http://www.surplussales.com/capacitors/Trans_Coup_Caps/cap_trans.html
And saw the TDK and Murata capacitors are labeled as high current.
Any suggestion before making an "investment"?
73's, Evert PA2KW
-----Original Message-----
From: Jim W7RY [mailto:w7ry@arrl.net]
Sent: Sunday, February 22, 2009 02:14
To: evert@pa2kw.com; amps@contesting.com
Subject: Re: [Amps] Doorknob quality
Are these for tune or loading padders? If not what function will they serve?
73
Jim W7RY
----- Original Message -----
From: "Evert Bakker (PA2KW)" <evert@pa2kw.com>
To: <amps@contesting.com>
Sent: Saturday, February 21, 2009 4:22 PM
Subject: [Amps] Doorknob quality
> Hello,
>
>
>
> When using doorknob capacitors for RF tuning circuits, is there something
> special I should aware off?
>
> (special quality, specific "family")
>
>
>
> I'm looking for on a 300pF/30kV in my 160 mtr amplifier
>
>
>
> Thanks
>
>
>
> 73's, Evert PA2KW
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
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