[Amps] B&W 850A Repair

[Paul Kraemer]

Whatever helps to get you through the night Carl
Best Regards
Paul K0UYA
----- Original Message ----- 
From: "Carl" <km1h at jeremy.mv.com>
To: "Paul Kraemer" <elespe at lisco.com>; <amps at contesting.com>
Sent: Saturday, October 27, 2012 8:29 AM
Subject: Re: [Amps] B&W 850A Repair


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