...well, if you need them so close, have a look at the multisection ,pie
wound chokes from James Millen. They have unequal sections, each with its
own, different resonant frequency . they're supposed to be resonance free in
the HF spectrum.
Alex 4Z5KS
"Jesus, come get your kids, they're tearing up my Mother's backyard!"
-----Original Message-----
From: Carl [mailto:km1h@jeremy.mv.com]
Sent: Sunday, December 07, 2008 6:46 PM
To: alexeban; 'Vic K2VCO'; 'OZ1AXG Flam'
Cc: 'Amps reflector'
Subject: Re: [Amps] Plate choke resonance and safe operation
Unfortunately 10% doesnt fly if you want 10 and 12M
Carl
KM1H
----- Original Message -----
From: "alexeban" <alexeban@gmail.com>
To: "'Vic K2VCO'" <vic@rakefet.com>; "'OZ1AXG Flam'"
<oz1axg.nospam@dxmail.dk>
Cc: "'Amps reflector'" <amps@contesting.com>
Sent: Sunday, December 07, 2008 11:42 AM
Subject: Re: [Amps] Plate choke resonance and safe operation
>A reasonable estimate would be about +- 10%away from the bands' edges:
>if
> you get a reasonable impedance that far off, you can assume to be
> safe.
> Alex 4Z5KS
>
> SunWolf
> "Jesus, come get your kids, they're tearing up my Mother's backyard!"
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On
> Behalf Of Vic K2VCO
> Sent: Sunday, December 07, 2008 6:21 PM
> To: OZ1AXG Flam
> Cc: Amps reflector
> Subject: Re: [Amps] Plate choke resonanse and safe operation
>
> OZ1AXG Flam wrote:
>> the RFC is Installed
>>
>> I will try to measure the resonans again. For 27 MHZ i did the
>> measurement
> 3
>> times. A grid dip meter is not the most accurate instrument, so i
>> will try
>
>> it again. but how close is "safe" ? what would the symptoms be at
>> tuneup
> if
>> resonans is close by ?
>
> You didn't mention it, but I assume that you know that the choke must
> be
> *shorted* when
> you dip it.
>
> I am afraid that the symptoms are mostly that the choke burns out!
> --
> 73,
> Vic, K2VCO
> Fresno CA
> http://www.qsl.net/k2vco
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>
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>
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