[Amps] dual section cap

[Carl]

Look at the Cardwell in Alpha photos for spacings and then swap sides with 
one section to further decrease coupling. An old Millen method from the 
40's.

Carl


----- Original Message ----- 
From: "MU 4CX250B" <4cx250b at miamioh.edu>
To: "Carl" <km1h at jeremy.mv.com>; "Amps" <amps at contesting.com>
Sent: Wednesday, June 25, 2014 9:32 PM
Subject: Re: [Amps] dual section cap


> Interesting, Carl. I don't understand why the minimum capacitance on
> the small section is so high. I suppose I could remove a plate nearest
> the frame of the capacitor, but I wouldn't think that would reduce the
> minimum capacitance to 6 pF. How did you accomplish that?
> 73,
> Jim W8ZR
> Sent from my iPhone
>
>> On Jun 25, 2014, at 7:20 PM, Carl <km1h at jeremy.mv.com> wrote:
>>
>> OK that explains it Jim, I thought you bought it with those markings on 
>> it.
>>
>> The poor response on the small section shows it wasnt designed for a good 
>> minimum capacitance which would be a problem on 10M with several tubes.
>>
>> I got one of those from OEP as a "sample", rebuilt it with a bit less C 
>> per section but 6pf min C on the small one, returned it, and had them 
>> make several runs for me of 10-20 at a time. They sold well.
>>
>> Carl
>> KM1H
>>
>>
>> ----- Original Message ----- From: "Jim Garland" <4cx250b at miamioh.edu>
>> To: "'Carl'" <km1h at jeremy.mv.com>; <amps at contesting.com>
>> Sent: Wednesday, June 25, 2014 7:07 PM
>> Subject: RE: [Amps] dual section cap
>>
>>
>>> Carl,
>>> I remeasured the cap, and the two sections are 17-63pF and 24-316 pF, 
>>> pretty
>>> much what I had measured before N years ago. A single section cap on the
>>> same frame would be 379 pF, or maybe a smidgen more since there would be
>>> coupling between two plates that are separated in the dual-section 
>>> version.
>>> I used a good quality cap meter and compensated for the lead 
>>> capacitance.
>>> 73,
>>> Jim W8ZR
>>>
>>>> -----Original Message-----
>>>> From: Carl [mailto:km1h at jeremy.mv.com]
>>>> Sent: Wednesday, June 25, 2014 4:00 PM
>>>> To: Jim Garland
>>>> Subject: Re: [Amps] Buck-Boost Transformer Selection
>>>>
>>>> Jim, that OEP cap of yours got me looking and it appears that somebody
>>> used
>>>> the full value for that frame. IE; the Cardwell 154-10 is rated at 
>>>> 347pf
>>> and
>>>> that frame length was used for the dual section.
>>>>
>>>> Carl
>>>> KM1H
>>>
>>>
>>>
>>>
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>>
>
>
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