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Re: [Amps] A tale of two IMs What happens?

To: Carl <km1h@jeremy.mv.com>
Subject: Re: [Amps] A tale of two IMs What happens?
From: Roger <sub1@rogerhalstead.com>
Date: Thu, 15 Apr 2010 17:20:43 -0400
List-post: <amps@contesting.com">mailto:amps@contesting.com>

Carl wrote:
>>
>> You are basically saying what I thought - an exact analysis is 
>> non-trivial. You
>> don't surprise me this has been done before, but it needs more than the 
>> ability
>> to use logs and add/subtract a few numbers on a pocket calculator.
>>     
>
>
> Correct. But, at some point it becomes pure Gaussian noise. Similar to 20M 
> in a SSB contest.....
>   
Or 40 and 75 during a summer night.
>
>   
>> Are any of the published papers available online free? I doubt many people 
>> are
>> going to want to pay $30 or so to download an IEEE paper, but perhaps some 
>> would
>> read them if available free.
>>     
>
>
> Ive no idea whats online, my involvement was before Al Gore invented the 
> Internet.
>   
I'm not one of 'ol Al's boosters, but he never claimed to have invented 
the Internet. It was the press and opposition that said that.  
http://en.wikipedia.org/wiki/Al_Gore_and_information_technology Although 
he is responsible for providing a lot of government money to those 
working on it back in those days. Computer systems and the Internet were 
my profession.

73

Roger (K8RI)
>   
>>> When I was designing CATV component based bi-directional data networks in
>>> the mid 80's the IMD as well as phase delay even in passive components 
>>> were
>>> of importance. At the time only C-Cor was able to provide consistent 
>>> quality
>>> amps to the specs required.
>>>
>>> Carl
>>> KM1H
>>>       
>> Whilst not claiming to know much about this, I suspect for amateur 
>> purposes to
>> assuming the worst of the exciter or the amplifier will not be too far 
>> from the
>> truth, though I could believe that approximation will be less precise if 
>> the IMD
>> of both the exciter and amplifier are similar. Does that sound reasonable 
>> from
>> your understanding of it?
>>     
>
>
> In a lab experiment yes. On the air when mixing with other signals most 
> anything is possible. Connect a SA to an antenna during a SSB contest and 
> look whats happening out of band.
>
> Carl
> KM1H
>
>
>
>
>   
>> Dave
>>
>>
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>>     
>
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>   
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