[Collins] Fwd: Re: Collins wattmeter alignment and calibration.

[Dr. Gerald N. Johnson]

I suspect the standard Collins wattmeter reference was an HP410B with 
its AC probe in a coax T and a good dummy load. For higher power the 
410B had an optional Red head attenuator for the AC probe and I saw that 
used at 5 KW power level.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.

On 5/15/2012 1:10 PM, Bob and Sue Jefferis wrote:
> Jerry,
>
> The revised link works. Thanks for making this available. Very interesting. Since the manuals I have are silent on error bounds, I had assumed it was about 10% full scale. With devices like the LP-100A and others that are readily available today, it isn't too hard to beat the Bird 43 and get into the 3-4 % of reading range without calibrated/certified attenuators and lab grade power meters. Of course, sufficiently stable 500 Watt sources for performing the high power scale calibration may still be a challenge.
>
> 73, Bob, KF6BC
> On May 15, 2012, at 9:36 AM, Dr. Gerald N. Johnson wrote:
>
>>
>>
>> -------- Original Message --------
>> Subject: Re: [Collins] Collins wattmeter alignment and calibration.
>> Date: Tue, 15 May 2012 11:35:32 -0500
>> From: Dr. Gerald N. Johnson<geraldj at weather.net>
>> Reply-To: geraldj at weather.net
>> To: K6SDE<k6SDE at yahoo.com>
>>
>> Typos, I'll repost. Should be
>> http://www.geraldj.networkiowa.com/papers/Collins/
>>
>> On 5/15/2012 11:28 AM, K6SDE wrote:
>>> */Not Found/*
>>>
>>> */ /*
>>>
>>> */The requested URL /paper/collins was not found on this server./*
>>>
>>> */Apache/2.2.21 (EL) Server at www.geraldj.networkiowa.com Port 80/*
>>>
>>> -----Original Message-----
>>> From: collins-bounces at mailman.qth.net
>>> [mailto:collins-bounces at mailman.qth.net] On Behalf Of Dr. Gerald N. Johnson
>>> Sent: Tuesday, May 15, 2012 8:45 AM
>>> To: Collins on QTH.net
>>> Subject: [Collins] Collins wattmeter alignment and calibration.
>>>
>>> Courtesy of Van, K7VS who found and scanned these pages, and Rod, K0DAS
>>>
>>> who wrote them from the original Collins calibration document, I have
>>>
>>> just posted then at: http://www.geraldj.networkiowa.com/paper/collins
>>>
>>> 73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association
>>>
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>>
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>