[AMPS] Re: RF choke resonates around 23.4 Mhz errr 22.4

[Jon Ogden]

>> Don't remove too many or it will resonante too close to 28 MHz.  I'd try to 
>get the resonance somewhere around 25 MHz or so.
>
>In that case I´m in trouble with the 12 meters band. I´ll try just 23.4 
>and see if there is any change in the 24.9Mhz tunning.If
>I go higher... I´m sure the Choke´s Q will degrade and might affect 12 and 
>10 meters.

Yep, if you are trying to operate on 12m then you are in trouble.  It's a tough predicament.  You can't go too high in resonant frequency or else your impedance lower in frequency will be too low.  And you gotta make sure you stay away from amateur bands.  

You could try going with a larger choke and resonante the beast around 11 or 12 MHz.  Hopefully, your second resonance point would be outside of or not near ham bands.  Your impedance will also probably still be large enough that you don't have any low impedance issues on the higher bands.

Or you could use 2 seperate chokes and switch them in and out depending on what bands you are using (big value choke for say, 80 and 40 meteres and a small value choke for 30, 20, 17, 15, 12 and 10).

Good luck.

73,

Jon
KE9NA


--------------------------------------------------------------------------
Jon Ogden

jono@enteract.com
www.qsl.net/ke9na

"A life lived in fear is a life half lived."


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