[Amps] placement of RF choke bypass cap.

[Carl]

Since the aluminum is assumed to be thicker than the RF surface depth on 
either side its center can be viewed as an insulator at above a certain RF 
frequency. A double sided PC board with the ends shorted has similar 
properties.

Double sided PC boards are regularly used in construction projects such as 
chassis, shields and enclosures. Even antennas.

Carl


----- Original Message ----- 
From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
To: <amps at contesting.com>
Sent: Friday, March 19, 2010 6:40 PM
Subject: Re: [Amps] placement of RF choke bypass cap.


> ORIGINAL MESSAGE:
>
> On Fri, 19 Mar 2010 15:17:19 -0400, "Carl" <km1h at jeremy.mv.com> wrote:
>
>> Proof of  JI's statements is the use of plated thru holes on
>>printed circuit boards, especially when run at RF. Look at all the effort
>>used in wrapping the edges in copper tape and then still having to use
>>plated thru or wire inserted holes to get the circuit to work.
>
> REPLY:
>
> If I understand you right, you are talking about a double sided PC
> board, which of course has a center insulator. We are talking about a
> solid sheet such as an aluminum  chassis.
>
> 73, Bill W6WRT
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