[Amps] B&W 850A Repair

[Paul Kraemer]

And I measure it at 0.1245" to 0.1255"
Our calipers are maintained by a lab using NIST standards and they were 
recently certified
Customer requirement---they pay for it---we enjoy the benefits
Potato potahto, call it an 1/8" down here in the stix
Paul K0UYA
----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "Paul Kraemer" <elespe at lisco.com>; <amps at contesting.com>
Sent: Friday, October 26, 2012 7:04 PM
Subject: Re: [Amps] B&W 850A Repair


>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".
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Amps mailing list
>>> Amps at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/amps
>>
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>