[Amps] B&W 850A Repair

[Carl]

I measure the wire at .1325 which equates to  #8 wire with the plating.

Carl
KM1H


----- Original Message ----- 
From: "Paul Kraemer" <elespe at lisco.com>
To: "Gary H. Harmon, Jr." <gharmon at idworld.net>; <amps at contesting.com>
Sent: Friday, October 26, 2012 6:57 PM
Subject: Re: [Amps] B&W 850A Repair


> 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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>
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