[Amps] B&W 850A Repair

[Carl]

Silver prices went up, plating thickness went down (-;

And #8 wire has long been a standard at .1285. Maybe your NIST boys are 
using Chinese instruments.......

Thats my story and Im sticking to it.

Carl
KM1H


----- Original Message ----- 
From: "Paul Kraemer" <elespe at lisco.com>
To: "Carl" <km1h at jeremy.mv.com>; <amps at contesting.com>
Sent: Friday, October 26, 2012 8:57 PM
Subject: Re: [Amps] B&W 850A Repair


> 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".
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>
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>>
>
>
>
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