[Amps] B&W 850A Repair

[Paul Kraemer]

Gary
No support except the back end.
Scaling "up" from a complete 851 (500w) the bars on the 851 are 5/16" wide 
with 1/8" material below the coil
Total thickness is the 1/8" plus wire diameter plus another 1/16".
The top is melted to anchor the turns
For the 850A that suggests that the bars need to be 3/8" wide by at least 
1/8" below the wire + the wire + another 1/6" (or more ) above the turns.
I would suggest a minimum of 3/8" square bars---or even up to 1/2" square 
since the wire diameter is a hefty 1/8"
Get some 3/8" or 1/2" stock from McMaster Carr and start notching with a 
fine tooth band saw or jig (scroll) saw.
The notch spacing is linear over the approximate 3 1/4" length of the coil
McMasterCarr doesn't list Lexan but this is similar 
http://www.mcmaster.com/#polycarbonate-sheets/=jw6q79
If you can find actual Lexan it is best. Does not shatter or chip. Extremely 
strong and easy to work. It is used in bulletproof glass windows.
Have fun cutting all those notches! Clamp the bars together and do 4 at 
once.
Paul K0UYA
----- Original Message ----- 
From: "Gary H. Harmon, Jr." <gharmon at idworld.net>
To: <amps at contesting.com>
Sent: Friday, October 26, 2012 3:07 PM
Subject: [Amps] B&W 850A Repair


>I need to replace the 4 plastic coil supports on my 850A band switching 
>coil
> assembly.  I have no pieces to measure so I need to know the width,
> thickness and length of the four pieces.  Is there some sort of support of
> the four pieces at the ends inside the coil or is the only fastener where
> they bolt to the L-shaped brackets connected to the front of the assembly?
> Any suggestions on how to fasten the coils turns to the strips?
>
>
>
> Vr,
>
>
>
> Gary H. Harmon, Jr. - K5JWK
>
> 6003 Archwood
>
> San Antonio, TX 78239-1504
>
> 210.657.1549h / 210.884.6926c
>
>
>
> "Retirement means every day is a Saturday except Sunday".
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